section 206-09 anti-lock brake system (abs) and...

SECTION 206-09 Anti-Lock Brake System (ABS) and Stability Control

CONTENTS PAGE

DIAGNOSIS AND TESTINGAnti-Lock Control ................................................................................................................................................................ 206-09-2

Principles of Operation ................................................................................................................................................. 206-09-2ABS with Traction Control and Electronic Stability Control (ESC) ......................................................................... 206-09-2Stability Control Sensors ........................................................................................................................................ 206-09-3Steering Wheel Rotation Sensor ............................................................................................................................ 206-09-3

Inspection and Verification ........................................................................................................................................... 206-09-4DTC Charts ................................................................................................................................................................... 206-09-5Symptom Chart ............................................................................................................................................................. 206-09-8Pinpoint Tests ............................................................................................................................................................... 206-09-9

206-09-i Anti-Lock Brake System (ABS) and Stability Control 206-09-i

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DIAGNOSIS AND TESTINGAnti-Lock ControlSpecial Tool(s)

Backprobe PinsPOM6411 or equivalent

Flex Probe Kit300-NUD105-R025DE or equivalent

Fluke 77-IV Digital MultimeterFLU77-4 or equivalent

Rotunda Active Wheel Speed Sensor Tester105-R0110

Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) softwarewith appropriate hardware, or equivalent scan tool

Principles of OperationABS with Traction Control and Electronic Stability Control (ESC)The ABS module with traction control manages anti-lock braking to maintain vehicle control and performs additional functions specific to traction controland Electronic Stability Control (ESC).

ABS OperationWhen the ignition switch is in the RUN position, the ABS module does a preliminary electrical check. At approximately 20 km/h (12 mph), the hydraulicpump motor is turned on for approximately one-half second. During this time a buzzing or humming noise may be heard and a vibration may be felt in thebrake pedal. This is a normal condition. Any malfunction of the ABS disables the stability assist and illuminates the ABS warning indicator. However, thepower-assist braking system functions normally.

The ABS module monitors and compares the rotational speed of each wheel. Wheel speeds are measured by the wheel speed sensor, which electricallysenses each tooth of the sensor ring as it passes through the magnetic field of the sensor. When the ABS module detects an impending wheel lock, the ABSmodule commands the hydraulic pump motor on and commands the Hydraulic Control Unit (HCU) to open and close the appropriate solenoid valves to

206-09-2 Anti-Lock Brake System (ABS) and Stability Control 206-09-2

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modulate the brake pressure to the individual brake caliper(s). Once the affected wheel(s) returns to the desired speed, the ABS module commands the HCUto return the solenoid valves to their normal position and normal base brake operation is restored.

The ABS module must be configured when a new ABS module is installed.

Electronic Brake Distribution (EBD)On initial application of the brake pedal, full pressure is applied to the rear brakes. The ABS module then uses wheel speed input to calculate an estimatedrate of deceleration. Once vehicle deceleration exceeds a predetermined threshold, the ABS module closes the appropriate isolation valves in the HCU tohold the rear brake pressure constant while allowing the front brake pressure to build. This creates a balanced braking condition between the front and rearwheels and minimizes the chance of rear wheel lockup during hard braking. As the vehicle decelerates, the valves are opened to increase the rear brakepressure in proportion to the front brake pressure. A slight bump sensation may be felt in the brake pedal when Electronic Brake Distribution (EBD) isactive. EBD will be disabled if DTCs are present for 2 or more wheel speed sensors. When EBD is disabled, the yellow ABS warning indicator and thesliding-car icon will be illuminated.

Traction ControlWhen the drive wheels lose traction and begin to spin, with vehicle speed under 100 km/h (62 mph), the ABS module commands the hydraulic pump motoron and commands the HCU to open and close the appropriate solenoid valves to modulate the brake pressure to the brake caliper(s) while simultaneouslysending a request to the PCM over the High Speed Controller Area Network (HS-CAN) bus to reduce engine torque to maintain vehicle traction. The PCMaccomplishes this with incremental timing changes and fewer fuel injector pulses until the ABS module ends the request. The request ends when the drivenwheel speed returns to the desired speed. After the vehicle speed exceeds 100 km/h (62 mph), traction control is accomplished using only the PCM torquecontrol function. The traction control system can be deactivated by pressing the traction control switch in the instrument panel.

Electronic Stability Control (ESC)The Electronic Stability Control (ESC) system constantly monitors the vehicle motion relative to the intended course. This is done by using sensors tocompare the steering input and the yaw rate sensor with that of the actual vehicle motion. The ESC system monitors information from the Throttle Position(TP) sensor, the steering wheel rotation sensor (steering wheel angle and rate of change) and a yaw rate sensor which is integral to the Restraints ControlModule (RCM) and measures changes in vehicle direction. If the ESC system determines from all these inputs that the vehicle is unable to travel in theintended direction, the system adjusts the brake torque at specific wheels in response to direct measurement of the vehicle motion and reduces engine torqueto allow the vehicle to follow the intended course.

Traction Control SwitchThe traction control switch is hardwired to the Instrument Panel Cluster (IPC). The IPC communicates switch status to the ABS module via the HS-CANbus. The traction control switch allows the driver to control use of the traction control and ESC systems. Traction control system status is indicated by thesliding-car icon in the IPC. The system will automatically restore to full functionality when the ignition switch is cycled from OFF to RUN.

Stability Control SensorsThe stability control sensors for the ESC system include the yaw rate sensor, lateral accelerometer and longitudinal accelerometer. The sensors are housed inthe RCM which sends sensor information to the ABS module over a dedicated Controller Area Network (CAN) bus. If any of the sensors are defective, anew RCM must be installed.

• The yaw rate sensor measures the relative vehicle motion about the vertical axis through its center of gravity.

• The lateral accelerometer measures the acceleration that corresponds to the force involved when the vehicle moves sideways.

• The longitudinal accelerometer measures the acceleration corresponding to the force involved when the vehicle moves forward and rearward in thehorizontal plane, along the centerline of the vehicle front and rear wheels.

Lateral acceleration has 2 forms. The first is the centrifugal acceleration that occurs when the vehicle travels around in a circle. The second is theacceleration due to gravity. On level ground there is no contribution from this acceleration. However, if the vehicle is parked sideways on a bank or incline,the sensor measures some lateral acceleration due to gravity, even though the vehicle is not moving.

Steering Wheel Rotation SensorThe steering wheel rotation sensor measures the rate of rotation of the steering wheel by monitoring the steering wheel rotation ring as it passes through thesensor gap. The steering wheel rotation sensor uses 2 signal lines to transmit information to the ABS module about whether the steering wheel is beingturned left or right and how far it is being turned. The steering wheel rotation sensor does not indicate the absolute position of the steering wheel relative tostraight-ahead. The stability assist system learns this position by comparing the steering wheel position with other signals and storing the position it haslearned. The stability assist system confirms this position and modifies it as necessary during every new driving cycle.

ABS Module CalibrationWhen a new ABS module, HCU, RCM or steering wheel rotation sensor is installed, the ABS module must be calibrated. The calibration procedure isrequired for the ABS module to learn the "zero-position" of the various ESC sensors and components.

If a DTC is logged for any component of the ESC system, the DTC must be repaired and then cleared before carrying out the calibration procedure. Theneed to calibrate the ABS module is also indicated by the sliding-car icon in the IPC flashing once every 2 seconds. The indicator flashes after clearing theDTCs that are associated with the ESC systems.

To calibrate the ABS module, carry out the IVD Initialization sequence using the scan tool. When carrying out the calibration procedure, the followingcriteria must be met.

• The vehicle must be on a level surface.

206-09-3 Anti-Lock Brake System (ABS) and Stability Control 206-09-3DIAGNOSIS AND TESTING (Continued)

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• The vehicle must not be moving.

• The transmission must be in NEUTRAL.

• The brake pedal must be applied.

If a DTC is retrieved after calibration, refer to the ABS Module DTC Chart in this section.

ABS Module ConfigurationWhen a new ABS module is installed on vehicles equipped with a 4.6L engine, it must be configured. Refer to Programmable Module Installation (PMI) inSection 418-01.

Vehicles equipped with a 4.0L or a 5.4L engine do not require PMI.

Inspection and Verification1. Verify the customer concern.

2. Verify the stoplamps operate correctly by pressing and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do notoperate correctly, refer to Section 417-01. If the stoplamps operate correctly, proceed to the next step.

3. Verify the base brake system operates correctly. If any concerns are present, address them before continuing with any ABS concerns. Refer to Section206-00. If the base brake system operates correctly, proceed to the next step.

4. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical Electrical

• Base brake system• Hydraulic Control Unit (HCU)• Steering wheel rotation sensor ring• Tire pressure• Tire size or mismatched tires• Wheel speed sensor ring

• ABS module• Battery Junction Box (BJB) fuse(s):

— 8 (40A)— 10 (30A)

• Smart Junction Box (SJB) fuse 34 (5A)• Brake Pedal Position (BPP) switch• Restraints Control Module (RCM)• Traction control switch• Steering wheel rotation sensor• Wheel speed sensor• Wiring, terminals or connectors

5. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

6. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

7. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:

• check the VCM connection to the vehicle.

• check the scan tool connection to the VCM.

• refer to Section 418-00, No Power To The Scan Tool, to diagnose no power to the scan tool.

8. If the scan tool does not communicate with the vehicle:

• verify the ignition is ON.

• verify the scan tool operation with a known good vehicle.

• refer to Section 418-00 to diagnose no response from the PCM.

9. Carry out the network test.

• If the scan tool responds with no communication for one or more modules, refer to Section 418-00.

• If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).

10. Clear the CMDTCs and carry out the self-test diagnostics for the ABS module and the IPC.

11. If the DTCs retrieved are related to the concern, go to the ABS Module DTC Chart. For all other DTCs, refer to Section 419-10.

12. If no DTCs related to the concern are retrieved, GO to Symptom Chart.


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DTC ChartsABS Module DTC Chart

DTC Description Action

B1317 Battery Voltage High GO to Pinpoint Test A.

B1318 Battery Voltage Low GO to Pinpoint Test A.

B1342 ECU is Faulted NOTE: If other DTCs are present, REPAIR them before installing a newcomponent.

CLEAR the DTCs. CARRY OUT the self-test and RETRIEVEthe DTCs. If DTC is retrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock Brake System (ABS) Module inthis section. CLEAR the DTCs. CARRY OUT the self-test withthe brake pedal not applied.

B2477 Module Configuration Failure For vehicles equipped with a 4.6L engine, CONFIGURE theABS module. REFER to Programmable Module Installation(PMI) in Section 418-01. CLEAR the DTCs. Using the scantool, CARRY OUT the IVD Initialization sequence. REPEATthe self-test. If DTC B2477 is retrieved again, INSTALL a newABS module. REFER to Anti-Lock Brake System (ABS)Module in this section. REPEAT the self-test. For all othervehicles, INSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. REPEAT the self-test.

B2900 VIN Mismatch GO to Pinpoint Test M.

C1095 ABS Hydraulic Pump Motor Circuit Failure GO to Pinpoint Test C.

C1096 ABS Hydraulic Pump Motor Circuit Open GO to Pinpoint Test C.

C1115 ABS Power Relay Output Short Circuit to Battery NOTE: If other DTCs are present, REPAIR them before installing a newcomponent.

CLEAR all DTCs. TEST DRIVE the vehicle above 32 km/h (20mph) and CARRY OUT at least one ABS stop. RETRIEVE theDTCs. If DTC C1115 is retrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock Brake System (ABS) Module inthis section. CLEAR the DTCs. CARRY OUT the self-test withthe brake pedal not applied.

C1145 RF Wheel Speed Sensor Input Circuit Failure GO to Pinpoint Test D.

C1155 LF Wheel Speed Sensor Input Circuit Failure GO to Pinpoint Test D.

C1165 RR Wheel Speed Sensor Input Circuit Failure GO to Pinpoint Test D.

C1175 LR Wheel Speed Sensor Input Circuit Failure GO to Pinpoint Test D.

C1185 ABS Power Relay Output Circuit Failure NOTE: If other DTCs are present, REPAIR them before installing a newcomponent.

CLEAR all DTCs. TEST DRIVE the vehicle above 32 km/h (20mph) and CARRY OUT at least one ABS stop. RETRIEVE anyDTCs. If the DTC is retrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock Brake System (ABS) Module inthis section. CLEAR the DTCs. CARRY OUT the self-test withthe brake pedal not applied.

C1194 ABS Outlet Valve Coil LF Circuit Failure GO to Pinpoint Test B.

C1198 ABS Inlet Valve Coil LF Circuit Failure GO to Pinpoint Test B.

C1210 ABS Outlet Valve Coil RF Circuit Failure GO to Pinpoint Test B.

C1214 ABS Inlet Valve Coil RF Circuit Failure GO to Pinpoint Test B.

C1222 Wheel Speed Mismatch GO to Pinpoint Test E.

C1233 LF Wheel Speed Input Signal Missing GO to Pinpoint Test E.

C1234 RF Wheel Speed Input Signal Missing GO to Pinpoint Test E.

C1235 RR Wheel Speed Input Signal Missing GO to Pinpoint Test E.

C1236 LR Wheel Speed Input Signal Missing GO to Pinpoint Test E.


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ABS Module DTC Chart (Continued)DTC Description Action

C1242 ABS Outlet Valve Coil LR Circuit Failure GO to Pinpoint Test B.

C1246 ABS Outlet Valve Coil RR Circuit Failure GO to Pinpoint Test B.

C1250 ABS Inlet Valve Coil LR Circuit Failure GO to Pinpoint Test B.

C1254 ABS Inlet Valve Coil RR Circuit Failure GO to Pinpoint Test B.

C1277 Steering Wheel Angle 1 and 2 Circuit Failure GO to Pinpoint Test F.

C1278 Steering Wheel Angle 1 and 2 Signal Faulted GO to Pinpoint Test F.

C1279 Yaw Rate Sensor Circuit Failure This DTC indicates a concern with the yaw rate sensor which isintegral to the Restraints Control Module (RCM). REFER toSection 501-20B to diagnose all the RCM DTCs. If no RCMDTCs are present, GO to Pinpoint Test K.

C1280 Yaw Rate Sensor Signal Fault This DTC indicates a concern with the yaw rate sensor which isintegral to the Restraints Control Module (RCM). REFER toSection 501-20B to diagnose the RCM. If a new yaw rate sensoris needed, a new RCM must be installed.

C1281 Lateral Accelerometer Circuit Failure This DTC indicates a concern with the yaw rate sensor which isintegral to the Restraints Control Module (RCM). REFER toSection 501-20B to diagnose all the RCM DTCs. If no RCMDTCs are present, GO to Pinpoint Test K.

C1282 Lateral Accelerometer Signal Fault This DTC indicates a concern with the lateral acceleration sensorwhich is integral to the RCM. REFER to Section 501-20B todiagnose the RCM. If a new lateral acceleration sensor isneeded, a new RCM must be installed.

C1288 Pressure Transducer Main/Primary Input Circuit Failure GO to Pinpoint Test H.

C1327 Hydraulic Base Brake Failure CHECK brake fluid level and ADJUST as needed. CLEAR DTCand REPEAT self-test. If DTC C1327 is retrieved again, REFERto Section 413-01 to diagnose brake fluid level switch.

C1329 ABS Outlet Valve Coil RF Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1330 ABS Outlet Valve Coil LR Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1331 ABS Outlet Valve Coil RR Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1332 ABS Outlet Valve Coil LF Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1333 ABS Inlet Valve Coil LR Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1334 ABS Inlet Valve Coil LF Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1335 ABS Inlet Valve Coil RF Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.


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ABS Module DTC Chart (Continued)DTC Description Action

C1336 ABS Inlet Valve Coil RR Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1404 Traction Control Valve Rear Circuit Failure GO to Pinpoint Test B.

C1410 Traction Control Valve LF Circuit Failure GO to Pinpoint Test B.

C1446 Brake Switch Circuit Failure GO to Pinpoint Test I.

C1527 Traction Control Rear Valve Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1528 Traction Control LF Valve Circuit Excessive Temperature CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1530 Dynamic Stability Control RF Valve Circuit ExcessiveTemperature

CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1531 Dynamic Stability Control LF Valve Circuit ExcessiveTemperature

CLEAR all DTCs. DRIVE the vehicle. RETRIEVE the DTCs. Ifthe DTC is retrieved again, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module in thissection. CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

C1730 Reference Voltage Out of Range (+5 V) If any other DTCs are present, diagnose those DTCs first.CLEAR all DTCs. DRIVE the vehicle. RETRIEVE DTCs. If theDTC is retrieved again, INSTALL a new ABS module. REFERto Anti-Lock Brake System (ABS) Module in this section.CLEAR the DTCs. CARRY OUT the self-test with the brakepedal not applied.

C1957 Dynamic Stability Control Valve RF Circuit Failure GO to Pinpoint Test B.

C1958 Dynamic Stability Control Valve LF Circuit Failure GO to Pinpoint Test B.

C1963 Stability Control Inhibit Warning GO to Pinpoint Test G.

C1991 Module Calibration Failure NOTE: REPAIR all other DTCs prior to diagnosing this DTC.

GO to Pinpoint Test J.

U0073 Control Module Communication Bus Off REFER to Section 418-00 to diagnose the High Speed ControllerArea Network (HS-CAN) bus.

U0074 Control Module Communication Bus B Off GO to Pinpoint Test K.

U0115 Lost Communication with ECM/PCM - Secondary (SPCM) REFER to Section 418-00 to diagnose the HS-CAN bus.

U0155 Lost Communication with Instrument Panel Cluster (IPC)Control Module

REFER to Section 418-00 to diagnose the HS-CAN bus.

U2050 No Application Present CLEAR the DTCs. REPEAT the self-test. RETRIEVE theDTCs. If DTC U2050 is retrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock Brake System (ABS) Module inthis section. CLEAR the DTC. REPEAT the self-test.

U2051 One or More Calibration Files Missing/Corrupt CLEAR the DTCs. CARRY OUT the ABS module self-test.RETRIEVE and RECORD any DTCs. If DTC U2051 isretrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this section. CLEAR theDTC. REPEAT the self-test.


2010 Mustang, 10/2009

Symptom Chart

Symptom ChartCondition Possible Sources Action

• No communication with the ABS module • Wiring, terminals or connectors• ABS module

• REFER to Section 418-00 to diagnose theno communication concern.

• The ABS warning indicator is always/neveron

• Wiring, terminals or connectors• ABS module• Instrument Panel Cluster (IPC)

• REFER to Section 413-01 to continuediagnosis of the warning indicator.

• The red brake warning indicator is always/never on

• Wiring, terminals or connectors• Parking brake switch• Brake fluid level switch (part of the master

cylinder)• IPC


• The stability/traction control indicator(sliding-car icon) is always/never on

• ABS module• PCM• IPC• Wiring, terminals or connectors• Traction control switch


• The stability/traction control indicator(sliding-car icon) is flashing at all times

• NOTE: It is normal for the indicator to flash duringa traction control event.

ABS module not configured• ABS/ESC system not initialized

• RETRIEVE and RECORD all ABS moduleDTCs and GO to the ABS Module DTCChart.

• The traction control system cannot bedisabled/enabled

• Fuse• Wiring, terminals or connectors• Traction control switch• PCM

• GO to Pinpoint Test L.

• The traction control system is inoperative • Traction control system is turned off• Traction control system is not configured• Fuse• Wiring, terminals or connectors• ABS wheel speed sensor fault• High Speed Controller Area Network (HS-

CAN) bus fault• PCM• IPC• Traction control switch

• GO to Pinpoint Test L.

• ABS false activation, ABS too sensitive orABS activates on a normal stop

• DTCs present in the ABS module • CARRY OUT the ABS module self-test.RETRIEVE and RECORD the ABS moduleDTCs. GO to the ABS Module DTC Chart.

• Brake pads• Brake calipers and/or guide pins

• ELIMINATE the base brake system as thecause of the problem. REFER to Diagnosisand Testing in Section 206-00.

• Parking brake shoes out of adjustment(dragging)

• CHECK and if necessary, ADJUST theparking brake shoes. REFER to Section206-05.

• Front wheel speed sensor rings • INSPECT both front wheel speed sensorrings for damaged teeth. CHECK the wheelspeed sensor gap.

• Wheel speed sensors • GO to Pinpoint Test E.

• Vehicle pulls during braking • Brake pads• Brake discs• Brake calipers and/or guide pins• Wheel speed sensor

• REFER to Section 206-00 to diagnose thebase braking system.

• One or more wheel(s) lock up • Brake pads• Brake calipers and/or guide pins



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Symptom Chart (Continued)Condition Possible Sources Action

• Parking brake shoes out of adjustment(dragging)

• CHECK and if necessary, ADJUST theparking brake shoes. REFER to Section206-05.

• Hydraulic outlet (dump) valve• Leaky inlet (isolation) valve during ABS

(soft)

• BLEED the HCU. REFER to Brake SystemBleeding in Section 206-00. TEST thesystem for normal operation. If the symptomreturns, INSTALL a new Hydraulic ControlUnit (HCU). REFER to Hydraulic ControlUnit (HCU) in this section.

• Brake tubes are installed in the wronglocations

• VERIFY the correct installation of eachbrake tube and REPAIR as needed.

• Soft/excessive brake pedal travel • Air in brake system• Brake calipers and/or guide pins• Brake flexible hose• Brake master cylinder• Brake pads• Brake pedal


• Inlet (isolation) valve or hydraulic outlet(dump) valve

• Leaky inlet (isolation) valve during ABSapplications (soft)

• BLEED the HCU. REFER to Brake SystemBleeding in Section 206-00. TEST thesystem for normal operation. If the symptomreturns, INSTALL a new HCU. REFER toHydraulic Control Unit (HCU) in thissection.

Pinpoint TestsPinpoint Test A: DTC B1317 or B1318Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe operating voltage required to supply the ABS module, hydraulic pump and isolation valves is in a range between 10 and 16 volts.

Fused battery voltage is supplied to the ABS module by Battery Junction Box (BJB) fuse 8 (40A) along circuit SBB08 (VT/RD) and BJB fuse 10 (30A)along circuit SBB10 (YE/RD). Fused ignition voltage is supplied to the ABS module by Smart Junction Box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground is supplied to the ABS module along circuit GD120 (BK/GN). There are 2 ground circuits (one for the ABS module and one for the ABS pumpmotor), and both share the same circuit number and wire color.

• DTC B1317 (Battery Voltage High) — If the voltage supplied to the ABS module exceeds 16 volts during the ABS module self-test or normaloperation, with vehicle speed greater than 5 km/h (3 mph), DTC B1317 will be set.

• DTC B1318 (Battery Voltage Low) — If the voltage supplied to the ABS module falls below 10 volts during the ABS module self-test or normaloperation, with vehicle speed greater than 5 km/h (3 mph), DTC B1318 will be set.

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors

• Vehicle charging system

• ABS module

PINPOINT TEST A: DTC B1317 OR B1318NOTE: DTC B1317 or B1318 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. Thebattery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended withthe accessories on.

NOTE: Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to Inspection and Verification in this section.

Test Step Result / Action to Take

A1 RETRIEVE ALL CMDTCs


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PINPOINT TEST A: DTC B1317 OR B1318 (Continued)Test Step Result / Action to Take

A1 RETRIEVE ALL CMDTCs (Continued)

• Ignition ON.• Enter the following diagnostic mode on the scan tool: Self Test — All

CMDTCs.• Is DTC B1317 or B1318 present in one or more modules AND

DTC P0563, P0620, P0625, P0626 or P065B present in the PCM?

YesREFER to Section 414-00 for diagnosis of the batteryand charging system.

NoGO to A2.

A2 CHECK BATTERY CONDITION

• Ignition OFF.• Refer to Section 414-01 and carry out the Battery — Condition Test.• Does the battery pass the condition test?

YesIf the battery passed the condition test but required arecharge, REFER to Section 414-00 to diagnose thecharging system. CLEAR all Continuous MemoryDiagnostic Trouble Codes (CMDTCs). TEST thesystem for normal operation.If the battery passed the condition test and did notrequire a recharge, GO to A3.

NoINSTALL a new battery. CLEAR all CMDTCs. TESTthe system for normal operation.

A3 CHECK THE CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine rpm to increase above 2,000 rpm while performing thisstep or the generator may self excite and result in default charging system outputvoltage. If engine rpm has gone above 2,000 rpm, shut the vehicle OFF andrestart the engine before performing this step.

• Start the engine.• Measure the voltage of the battery:

— For DTC B1317, turn off all accessories and run the engine at1,500 rpm for a minimum of 2 minutes.

— For DTC B1318, turn on headlights and HVAC fan on high andrun engine at 1,500 rpm for a minimum of 2 minutes.

• Is the battery voltage between 13-15.2 volts?

YesFor DTC B1318, GO to A4.For DTC B1317, INSTALL a new ABS module. REFERto Anti-Lock Brake System (ABS) Module in thissection. Using the scan tool, CARRY OUT the IVDInitialization sequence. CLEAR all CMDTCs. REPEATthe self-test.

NoREFER to Section 414-00 to diagnose the chargingsystem. CLEAR all CMDTCs. TEST the system fornormal operation.

A4 CHECK THE VOLTAGE TO THE ABS MODULE

• Ignition OFF.• Disconnect: ABS Module C135.• Ignition ON.• Measure the voltage between ground and:

— ABS module C135-25, circuit SBB10 (YE/RD), harness side.— ABS module C135-1, circuit SBB08 (VT/RD), harness side.— ABS module C135-30, circuit CBP34 (VT/BN), harness side.

YesGO to A5.

NoIf the voltage at pin 25 is less than 10 volts, VERIFYBJB fuse 10 (30A) is OK.If the voltage at pin 1 is less than 10 volts, VERIFY BJBfuse 8 (40A) is OK.If the voltage at pin 30 is less than 10 volts, VERIFYSJB fuse 34 (5A) is OK. If any fuse is not OK, REFERto the Wiring Diagrams manual to identify the possiblecauses of the circuit short. If fuses are OK, REPAIR the


2010 Mustang, 10/2009

PINPOINT TEST A: DTC B1317 OR B1318 (Continued)A4 CHECK THE VOLTAGE TO THE ABS MODULE (Continued)

• Are the voltages greater than 10 volts?affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

A5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN

• Ignition OFF.• Measure the resistance between ground and:

— ABS module C135-38, circuit GD120 (BK/GN), harness side.— ABS module C135-13, circuit GD120 (BK/GN), harness side.

• Are the resistances less than 5 ohms?

YesGO to A6.

NoREPAIR the affected circuit(s). CLEAR the DTCs.REPEAT the self-test.

A6 CHECK FOR CORRECT ABS MODULE OPERATION

• Check ABS module C135 for:

— corrosion.— pushed-out pins.— spread terminals.

• Connect: ABS Module C135.• Make sure the connector is fully seated and locked, then operate the

system and verify the concern is still present.• Is the concern still present?

YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector or a malfunctioning charging system. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

Pinpoint Test B: DTCs C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254, C1404, C1410, C1957 and C1958Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe operating voltage required to operate the valves in the Hydraulic Control Unit (HCU) is in a range between 10 and 16 volts.

Fused battery voltage is supplied to the ABS module by Battery Junction Box (BJB) fuse 8 (40A) along circuit SBB08 (VT/RD) and BJB fuse 10 (30A)along circuit SBB10 (YE/RD). Fused ignition voltage is supplied to the ABS module by Smart Junction Box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground is provided to the ABS module along circuit GD120 (BK/GN). There are 2 ground circuits (one for the ABS module and one for the ABSpump motor), and both share the same circuit number and wire color.


2010 Mustang, 10/2009

DTC Description Fault Trigger Conditions

• C1194 — ABS Outlet Valve Coil LF Circuit Failure• C1198 — ABS Inlet Valve Coil LF Circuit Failure• C1210 — ABS Outlet Valve Coil RF Circuit Failure• C1214 — ABS Inlet Valve Coil RF Circuit Failure• C1242 — ABS Outlet Valve Coil LR Circuit Failure• C1246 — ABS Outlet Valve Coil RR Circuit Failure• C1250 — ABS Inlet Valve Coil LR Circuit Failure• C1254 — ABS Inlet Valve Coil RR Circuit Failure• C1404 — Traction Control Valve Rear Circuit Failure• C1410 — Traction Control Valve LF Circuit Failure• C1957 — Dynamic Stability Control Valve RF Circuit Failure• C1958 — Dynamic Stability Control Valve LF Circuit Failure

If, during normal operation or the on-demand self test, the ABS moduledetects an open circuit, short to ground or battery, or a defective triggercircuit, the appropriate DTC will be set.



• Vehicle charging system

• ABS module

PINPOINT TEST B: DTCs C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254, C1404,C1410, C1957 AND C1958


B1 CHECK FOR RETURNING DTCs

• Ignition ON.• Connect the scan tool.• Using the scan tool, clear all ABS module DTCs.• Test drive the vehicle above 32 km/h (20 mph) and carry out at least

one ABS stop.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Do any ABS module DTCs return?

YesREPAIR all other ABS module DTCs before repairingany valve coil failure DTCs. REFER to the ABS ModuleDTC Chart in this section.If multiple (2 or more) valve coil failure DTCs return,GO to B2.If only a single valve coil failure DTC returns, INSTALLa new ABS module. REFER to Anti-Lock Brake System(ABS) Module in this section. CLEAR the DTCs.REPEAT the self-test with the brake pedal not applied.

NoThe system is operating correctly at this time.

B2 CHECK THE VOLTAGE TO THE ABS MODULE

• Ignition OFF.• Disconnect: ABS Module C135.• Ignition ON.• Measure the voltage between ground and:

— ABS module C135-25, circuit SBB10 (YE/RD), harness side.— ABS module C135-1, circuit SBB08 (VT/RD), harness side.— ABS module C135-30, circuit CBP34 (VT/BN), harness side.

• Are the voltages greater than 10 volts?

YesGO to B3.

NoIf the voltage at pin 25 is less than 10 volts, VERIFYBJB fuse 10 (30A) is OK.If the voltage at pin 1 is less than 10 volts, VERIFY BJBfuse 8 (40A) is OK.If the voltage at pin 30 is less than 10 volts, VERIFYSJB fuse 34 (5A) is OK. If any fuse is not OK, REFERto Wiring Diagrams manual to identify the possiblecauses of the circuit short. If the fuses are OK, REPAIRthe affected circuit(s). CLEAR the DTCs. REPEAT theself-test.

B3 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN


2010 Mustang, 10/2009

PINPOINT TEST B: DTCs C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254, C1404,C1410, C1957 AND C1958 (Continued)

B3 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN (Continued)




YesGO to B4.


B4 CHECK FOR CORRECT ABS MODULE OPERATION







Pinpoint Test C: DTCs C1095 and C1096Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationFused battery voltage for hydraulic pump motor operation is supplied to the ABS module by Battery Junction Box (BJB) fuse 8 (40A) along circuit SBB08(VT/RD). Ground is provided to the ABS module along circuit GD120 (BK/GN).

When the ignition key is turned to the ON position, the ABS module commands the Hydraulic Control Unit (HCU) pump on for 100 ms (±6 ms) and is thencommanded off. After 6 ms, the ABS module will read the voltage that is being generated by the HCU pump. If the voltage indicates the motor is spinning atless than 500 rpm, there may be a locked motor. If this condition is detected 4 times, DTC C1095 is set. The pump motor is checked for an open circuit 2seconds after the most recent successful pump motor off command. If the pump motor feedback remains greater than 0.75 volt for more than 50 ms (±6 ms)after these conditions have been met, DTC C1096 is set.

• DTC C1095 (ABS Hydraulic Pump Motor Circuit Failure) — If a short to voltage or ground is detected, if a locked up pump motor is detected or ifthere is an internal failure of the ABS module, DTC C1095 will be set.

• DTC C1096 (ABS Hydraulic Pump Motor Circuit Open) — If a short to voltage, a short to ground or an open is detected, if a locked up pump motor isdetected or if there is an internal failure of the ABS module, DTC C1096 will be set.


• Fuse


• Hydraulic pump motor

• ABS module

PINPOINT TEST C: DTCs C1095 AND C1096NOTICE:


2010 Mustang, 10/2009

PINPOINT TEST C: DTCs C1095 AND C1096 (Continued)Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.


C1 CHECK THE ABS PUMP MOTOR

• Ignition ON.• Is the ABS pump motor running all the time?

YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. CLEARthe DTCs. REPEAT the self-test.

NoGO to C2.

C2 CHECK FOR ABS MODULE DTCs

• Connect the scan tool.• Ignition ON.• Using the scan tool, clear the ABS module DTCs.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Retrieve and record all ABS module DTCs.• Is DTC C1095 or C1096 present?

YesIf DTC C1095 is retrieved, GO to C4.If DTC C1096 is retrieved, INSTALL a new ABSmodule. REFER to Anti-Lock Brake System (ABS)Module in this section. CLEAR the DTCs. CARRY OUTthe self-test with the brake pedal not applied.If DTC C1096 returns, INSTALL a new HCU. REFER toHydraulic Control Unit (HCU) in this section. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

NoGO to C3.

C3 CHECK FOR RETURNING ABS MODULE DTCs

• Using the scan tool, clear the ABS module DTCs.• Test drive the vehicle at speeds greater than 32 km/h (20 mph) and

carry out at least one ABS stop.• Connect the scan tool.• Ignition ON.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module .• Retrieve and record the ABS module DTCs.• Are any DTCs present?

YesIf DTC C1096 is retrieved, GO to C6.If DTC C1095 is retrieved, INSTALL a new HCU.REFER to Hydraulic Control Unit (HCU) in this section.CLEAR the DTCs. REPEAT the self-test.For all other ABS module DTCs, GO to the ABSModule DTC Chart.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

C4 CHECK THE VOLTAGE TO THE ABS MODULE

• Ignition OFF.• Disconnect: ABS Module C135.• Ignition ON.• Measure the voltage between ABS module C135-1, circuit SBB08

(VT/RD), harness side and ground.

• Is the voltage greater than 10 volts?

YesGO to C5.

NoVERIFY BJB fuse 8 (40A) is OK. If OK, REPAIRSBB08 (VT/RD). If not OK, REFER to the WiringDiagrams manual to identify possible causes of thecircuit short. CLEAR the DTCs. REPEAT the self-test.

C5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN


YesGO to C6.


2010 Mustang, 10/2009

PINPOINT TEST C: DTCs C1095 AND C1096 (Continued)C5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN (Continued)



NoREPAIR circuit GD120 (BK/GN). CLEAR the DTCs.REPEAT the self-test.

C6 CHECK FOR CORRECT ABS MODULE OPERATION







Pinpoint Test D: DTCs C1145, C1155, C1165 and C1175

Normal OperationThe wheel speed sensors are "active" sensors and generate a square wave signal that is sent to the ABS module. When the ignition is turned to the RUNposition, the ABS module carries out a self-test to determine if the sensors are functional. Voltage and ground are supplied to the front wheel speed sensorsfrom the ABS module along a pair of wires.

Wheel speed sensor DTCs will automatically clear when a successful test drive is carried out. A successful test drive should include speeds above 32 km/h(20 mph) and at least one ABS stop.

DTC Description Fault Trigger Condition

• C1145 — RF Wheel Speed Sensor Input Circuit Failure• C1155 — LF Wheel Speed Sensor Input Circuit Failure• C1165 — RR Wheel Speed Sensor Input Circuit Failure• C1175 — LR Wheel Speed Sensor Input Circuit Failure

If, during the ABS module on-demand self test or during normal operation,the ABS module detects an open, short to ground or voltage or a defectivewheel speed sensor input circuit, the appropriate DTC will be set. TheseDTCs are usually set by a damaged sensor or a circuit fault.



• Wheel speed sensor ring

• Wheel speed sensor

• ABS module

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.


2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175 (Continued)Test Step Result / Action to Take

D1 CHECK THE ABS HARNESS AND MODULE FOR WATER INTRUSION

• Ignition OFF.• Disconnect: ABS Module C135.• Inspect the ABS module connector and module for water intrusion.• Is there any evidence of water entry?

YesCLEAN the connector and dry it out with low pressurecompressed air. INSPECT for evidence of water entryand REPAIR as necessary. TEST DRIVE the vehicleabove 32 km/h (20 mph) and CARRY OUT at least oneABS stop.

NoGO to D2.

D2 CHECK FOR FAULT REPEATABILITY

• Connect: ABS Module C135.• Connect the scan tool.• Ignition ON.• Using the scan tool, clear the ABS module DTCs.• Drive the vehicle at least 16 km/h (10 mph).• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Retrieve and document ABS module DTCs.• Are DTCs C1145, C1155, C1165 and/or C1175 retrieved?

YesIf the Rotunda Active Wheel Speed Sensor Tester isavailable, GO to D3.If the Rotunda Active Wheel Speed Sensor Tester isnot available, GO to D5.

NoINSPECT the wheel speed sensors, wheel speedsensor wiring and wheel speed sensor tone rings.REPAIR or INSTALL new as necessary. If any otherDTCs are retrieved, GO to the ABS Module DTC Chart.

D3 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER

• Ignition OFF.• Disconnect: Suspect Wheel Speed Sensor.• Connect the Rotunda Active Wheel Speed Sensor Tester to the wheel

speed sensor connectors.• Ignition ON.• Select the correct system polarity on the Rotunda Active Wheel

Speed Sensor Tester and turn the power switch to the ON position.• Is the module output LED illuminated?

YesGO to D4.

NoGO to D7.

D4 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER

• Raise the suspect wheel until it can spin freely. Refer to Section100-02.

• While monitoring the Rotunda Active Wheel Speed Sensor Tester,slowly spin the suspect wheel.

• Do the sensor output LEDs illuminate and flash and is thecurrent overload LED not illuminated?

YesThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. TEST DRIVE the vehicle above 32 km/h (20mph) and CARRY OUT at least one ABS stop.

NoIf the current level LED is not illuminated and thesensor output LEDs do not illuminate or if the currentlevel LED is illuminated red, INSTALL a new wheelspeed sensor. REFER to Wheel Speed Sensor —Front and/or Wheel Speed Sensor — Rear in thissection. TEST DRIVE the vehicle above 32 km/h (20mph) and CARRY OUT at least one ABS stop. CLEARany DTCs. REPEAT the self-test.If the current level LED is not illuminated and thesensor output LEDs illuminate green but do not flash,INSPECT the wheel speed sensor tone ring andINSTALL new if necessary. If the tone ring is OK,INSTALL a new wheel speed sensor, REFER to WheelSpeed Sensor — Front and/or Wheel Speed Sensor —Rear in this section. TEST DRIVE the vehicle above 32km/h (20 mph) and CARRY OUT at least one ABSstop.

D5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

NOTE: Both circuits must be checked for each DTC.

• Ignition OFF.• Disconnect: ABS Module C135.

YesREPAIR the affected circuit(s). TEST DRIVE thevehicle above 32 km/h (20 mph) and CARRY OUT atleast one ABS stop.


2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175 (Continued)D5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE (Continued)

• Disconnect: Suspect Wheel Speed Sensor.• Ignition ON.• For DTC C1145 (RF), measure the voltage between ground and:

— ABS module C135-3, circuit VCA05 (GY/VT), harness side.— ABS module C135-4, circuit RCA19 (VT), harness side.

• For DTC C1155 (LF), measure the voltage between ground and:— ABS module C135-27, circuit VCA03 (VT/WH), harness side.— ABS module C135-28, circuit RCA17 (YE), harness side.

• For DTC C1165 (RR), measure the voltage between ground and:— ABS module C135-10, circuit RCA20 (BN), harness side.— ABS module C135-11, circuit VCA06 (WH/OG), harness side.

• For DTC C1175 (LR), measure the voltage between ground and:— ABS module C135-36, circuit VCA04 (BU/OG), harness side.— ABS module C135-35, circuit RCA18 (BN/GN), harness side.

NoGO to D6.


2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175 (Continued)D5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE (Continued)

• Is any voltage present?

D6 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND


• Ignition OFF.• For DTC C1145 (RF), measure the resistance between ground and:

— ABS module C135-3, circuit VCA05 (GY/VT), harness side.— ABS module C135-4, circuit RCA19 (VT), harness side.

• For DTC C1155 (LF), measure the resistance between ground and:— ABS module C135-27, circuit VCA03 (VT/WH), harness side.— ABS module C135-28, circuit RCA17 (YE), harness side.

• For DTC C1165 (RR), measure the resistance between ground and:— ABS module C135-10, circuit RCA20 (BN), harness side.— ABS module C135-11, circuit VCA06 (WH/OG), harness side.

YesGO to D7.

NoREPAIR the affected circuit(s). TEST DRIVE thevehicle above 32 km/h (20 mph) and CARRY OUT atleast one ABS stop.


2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175D6 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND (Continued)

• For DTC C1175 (LR), measure the resistance between ground and:— ABS module C135-36, circuit VCA04 (BU/OG), harness side.— ABS module C135-35, circuit RCA18 (BN/GN), harness side.

• Are the resistances greater than 10,000 ohms?

D7 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN


• Ignition OFF.• Disconnect: ABS Module C135.• Measure the resistance between the ABS module connector, harness

side and the suspect wheel speed sensor connector, harness side asindicated in the following chart:

ABS Module Circuit Wheel SpeedSensor

DTC C1145 (RF) — Wheel Speed Sensor RF Input CircuitFailure

C135-4 RCA19 (VT) C160-2

C135-3 VCA05 (GY/VT) C160-1

DTC C1155 (LF) — Wheel Speed Sensor LF Input Circuit Failure

C135-28 RCA17 (YE) C150-2

C135-27 VCA03 (VT/WH) C150-1

DTC C1165 (RR) — Wheel Speed Sensor RR Input CircuitFailure

C135-10 RCA20 (BN) C3117-2

C135-11 VCA06 (WH/OG) C3117-1

YesGO to D8.



2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175D7 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN (Continued)

(Continued)ABS Module Circuit Wheel Speed

Sensor

DTC C1175 (LR) — Wheel Speed Sensor LR Input CircuitFailure

C135-35 RCA18 (BN/GN) C3116-2

C135-36 VCA04 (BU/OG) C3116-1


D8 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS

• For DTC C1145 (RF), measure the resistance between RF wheelspeed sensor C160-1, circuit VCA05 (GY/VT), harness side and RFwheel speed sensor C160-2, circuit RCA19 (VT), harness side.

• For DTC C1155 (LF), measure the resistance between LF wheelspeed sensor C150-1, circuit VCA03 (VT/WH), harness side and LFwheel speed sensor C150-2, circuit RCA17 (YE), harness side.

• For DTC C1165 (RR), measure the resistance between RR wheelspeed sensor C3117-1, circuit VCA06 (WH/OG), harness side andRR wheel speed sensor C3117-2, circuit RCA20 (BN), harness side.

YesGO to D9.



2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175D8 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS (Continued)

• For DTC C1175 (LR), measure the resistance between LR wheelspeed sensor C3116-1, circuit VCA04 (BU/OG), harness side and LRwheel speed sensor C3116-2, circuit RCA18 (BN/GN), harness side.


D9 CHECK THE ABS MODULE OUTPUT

• Connect: ABS Module C135.• Ignition ON.• For DTC C1145 (RF), measure the voltage between RF wheel speed

sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheelspeed sensor C160-2, circuit RCA19 (VT), harness side.

• For DTC C1155 (LF), measure the voltage between LF wheel speedsensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheelspeed sensor C150-2, circuit RCA17 (YE), harness side.

YesINSTALL a new wheel speed sensor. REFER to WheelSpeed Sensor — Front and/or Wheel Speed Sensor —Rear in this section. TEST DRIVE the vehicle above 32km/h (20 mph) and CARRY OUT at least one ABSstop.

NoGO to D10.


2010 Mustang, 10/2009

PINPOINT TEST D: DTCs C1145, C1155, C1165 AND C1175D9 CHECK THE ABS MODULE OUTPUT (Continued)

• For DTC C1165 (RR), measure the voltage between RR wheel speedsensor C3117-1, circuit VCA06 (WH/OG), harness side and RR wheelspeed sensor C3117-2, circuit RCA20 (BN), harness side.

• For DTC C1175 (LR), measure the voltage between LR wheel speedsensor C3116-1, circuit VCA04 (BU/OG), harness side and LR wheelspeed sensor C3116-2, circuit RCA18 (BN/GN), harness side.


D10 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect: ABS Module C135.• Check the connector for:

— evidence of water entry into the connector.— corrosion.— pushed-out pins.— spread terminals.



YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. TESTDRIVE the vehicle above 32 km/h (20 mph) andCARRY OUT at least one ABS stop.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. TEST DRIVE the vehicle above 32 km/h (20mph) and CARRY OUT at least one ABS stop.


2010 Mustang, 10/2009

Pinpoint Test E: ABS False Activation, ABS Too Sensitive or ABS Activates on a Normal Stop

Normal OperationThe wheel speed sensors are "active" sensors and generate a square wave signal that is sent to the ABS module. When the ignition is turned to the RUNposition, the ABS module carries out a self-test to determine if the sensors are functional. Voltage and ground are supplied to the front wheel speed sensorsfrom the ABS module along 2 circuits.

Wheel speed sensor DTCs will automatically clear when a successful test drive is carried out. A successful test drive should include speeds above 32 km/h(20 mph) and at least one ABS stop.


• C1222 — Wheel Speed Mismatch When the vehicle speed exceeds 20 km/h (12 mph), if the ABS moduledetects a difference between wheel speed sensor signals, DTC C1222 willbe set. DTC C1222 can also be set by damaged tone rings, mismatchedwheel and/or tire sizes or driving the vehicle on one or more deflated tires.

• C1233 — LF Wheel Speed Sensor Signal Missing• C1234 — RF Wheel Speed Sensor Signal Missing• C1235 — RR Wheel Speed Sensor Signal Missing• C1236 — LR Wheel Speed Sensor Signal Missing

When the vehicle speed exceeds 20 km/h (12 mph), if the ABS module doesnot receive a signal from the wheel speed sensor, the appropriate DTC willbe set. These DTCs can also be set by an excessive wheel speed sensor-to-tone ring air gap or a damaged tone ring.


• Mismatched tire sizes

• Wheel speed sensor ring

• Wheel speed sensor

• ABS module

• Front wheel bearings

PINPOINT TEST E: ABS FALSE ACTIVATION, ABS TOO SENSITIVE OR ABS ACTIVATES ON ANORMAL STOP

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.


E1 CHECK THE DTCs FROM THE SELF TEST

• Check the recorded results from the ABS self-test.• Is DTC C1145, C1155, C1165 or C1175 present?

YesGO to Pinpoint Test D.

NoGO to E2.

E2 CHECK THE TIRES SIZE AND PRESSURE

• Verify that the tires are the correct size for the vehicle as indicated onthe Vehicle Certification (VC) label.

• Verify that the air pressure in each tire is correct as indicated on theVC label.

• Are the wheels and tires OK?

YesGO to E3.

NoINSTALL the correct size tire or adjust tire pressure asnecessary.

E3 INSPECT THE WHEEL SPEED SENSOR MOUNTING

• Ignition OFF.• With the vehicle in NEUTRAL, position it on a hoist. Refer to Section

100-02.• Inspect the suspect wheel speed sensor for looseness.• Is the wheel speed sensor loose?

YesTIGHTEN the wheel speed sensor to specification.REFER to Specifications in this section. CLEAR theDTCs. GO to E4.

NoGO to E5.

E4 RECHECK THE WHEEL SPEED PIDs

• Ignition ON.• Monitor the following PIDs while driving the vehicle at a constant

speed:— Left front wheel speed sensor (LF_WSPD)— Right front wheel speed sensor (RF_WSPD)

YesThe vehicle is OK. The concern may have been causedby a loose wheel speed sensor.


2010 Mustang, 10/2009

PINPOINT TEST E: ABS FALSE ACTIVATION, ABS TOO SENSITIVE OR ABS ACTIVATES ON ANORMAL STOP (Continued)

E4 RECHECK THE WHEEL SPEED PIDs (Continued)— Left rear wheel speed sensor (LR_WSPD)— Right rear wheel speed sensor (RR_WSPD)

• Are all the wheel speed sensor PID values similar?NoGO to E5.

E5 INSPECT THE WHEEL SPEED SENSOR FOR DAMAGE

• NOTE: Examine the wheel speed sensor wire carefully with a good lightsource. Failure to verify damage in the wheel speed sensor wire canlead to unnecessary installation of a new component.

Inspect the suspect wheel speed sensor for general damage.• Is the wheel speed sensor OK?

YesGO to E6.

NoINSTALL a new wheel speed sensor. REFER to WheelSpeed Sensor — Front or Wheel Speed Sensor —Rear in this section. CLEAR the DTCs. REPEAT theself-test.

E6 INSPECT THE WHEEL SPEED SENSOR RING FOR DAMAGE

• Inspect the suspect wheel speed sensor ring for damaged or missingteeth. Rotate the wheel to verify that no teeth are missing.

• Is the wheel speed sensor ring OK?

YesFor DTCs C1222, C1233 and C1234, GO to E7.For DTCs C1235 and C1236, if the Active WheelSpeed Sensor Tester is available, GO to E8. If theActive Wheel Speed Sensor Tester is not available, GOto E10.

NoINSTALL a new front or rear wheel speed sensor ring.For the front wheel speed sensor tone ring, REFER toWheel Speed Sensor Ring — Front in this section. Forthe rear wheel speed sensor tone ring, REFER toWheel Speed Sensor Ring — Rear in this section.CLEAR the DTCs. REPEAT the self-test.

E7 INSPECT THE WHEEL BEARING FOR DAMAGE

• Inspect the wheel bearings for damage.• Are the wheel bearings OK?

YesIf the Active Wheel Speed Sensor Tester is available,GO to E8.If the Active Wheel Speed Sensor Tester is notavailable, GO to E10.

NoINSTALL a new wheel bearing and wheel hub asnecessary. REFER to Section 204-01 for front wheelhubs or Section 204-02 for rear wheel hubs. CLEARthe DTCs. REPEAT the self-test.

E8 CHECK THE ABS MODULE OUTPUT USING THE ACTIVE WHEEL SPEED SENSOR TESTER

• Ignition OFF.• Disconnect: Suspect Wheel Speed Sensor.• Connect the Active Wheel Speed Sensor Tester to the wheel speed

sensor connectors.• Ignition ON.• Select the correct system polarity on the Active Wheel Speed Sensor

Tester and turn the Active Wheel Speed Sensor Tester power switchto the ON position.

• Is the module output LED illuminated?

YesGO to E9.

NoGO to E11.

E9 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ACTIVE WHEEL SPEED SENSOR TESTER

• Raise the suspect wheel until it can spin freely. Refer to Section100-02.

• While monitoring the Active Wheel Speed Sensor Tester, slowly spinthe suspect wheel.

• Do the sensor output LEDs illuminate and flash and is thecurrent overload LED not illuminated?

YesThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. CLEAR the DTCs. REPEAT the self-test.

NoIf the current level LED is not illuminated and thesensor output LEDs do not illuminate or if the currentlevel LED is illuminated red, INSTALL a new wheelspeed sensor. For the front wheel speed sensor,REFER to Wheel Speed Sensor — Front in this


2010 Mustang, 10/2009


E9 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ACTIVE WHEEL SPEED SENSOR TESTER (Continued)section. For the rear wheel speed sensor, REFER toWheel Speed Sensor — Rear in this section. CLEARthe DTCs. REPEAT the self-test.If the current level LED is not illuminated and thesensor output LEDs illuminate green but do not flash,INSPECT the wheel speed sensor tone ring andINSTALL new if necessary. For the front wheel speedsensor tone ring, REFER to Wheel Speed Sensor Ring— Front in this section. For the rear wheel speedsensor tone ring, REFER to Wheel Speed Sensor Ring— Rear in this section. If the tone ring is OK, INSTALLa new wheel speed sensor. For the front wheel speedsensor, REFER to Wheel Speed Sensor — Front in thissection. For the rear wheel speed sensor, REFER toWheel Speed Sensor — Rear in this section. CLEARthe DTCs. REPEAT the self-test.

E10 CHECK THE ABS MODULE OUTPUT

• Ignition OFF.• Disconnect: Suspect Wheel Speed Sensor.• Ignition ON.• For DTC C1233, measure the voltage between LF wheel speed

sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speedsensor C150-1, circuit VCA03 (VT/WH), harness side.

• For DTC C1234, measure the voltage between RF wheel speedsensor C160-2, circuit RCA19 (VT), harness side and RF wheelspeed sensor C160-1, circuit VCA05 (GY/VT), harness side.

• For DTC C1235, measure the voltage between RR wheel speedsensor C3117-2, circuit RCA20 (BN), harness side and RR wheelspeed sensor C3117-1, circuit VCA06 (WH/OG), harness side.

• For DTC C1236, measure the voltage between LR wheel speedsensor C3116-2, circuit RCA18 (BN/GN), harness side and LR wheelspeed sensor C3116-1, circuit VCA04 (BU/OG), harness side.

• Are the voltages greater than 10 volts?

YesINSTALL a new wheel speed sensor. For the frontwheel speed sensor, REFER to Wheel Speed Sensor— Front or Wheel Speed Sensor — Rear in thissection. CLEAR the DTCs. REPEAT the self-test.

NoGO to E11.

E11 CHECK THE WHEEL SPEED CIRCUITS FOR AN OPEN


• Ignition OFF.• Disconnect: ABS Module C135.• Disconnect: Suspect Wheel Speed Sensor.• Measure the resistance between the ABS module connector, harness

side and the suspect wheel speed sensor connector, harness side asindicated in the following chart:

YesGO to E12.



2010 Mustang, 10/2009


E11 CHECK THE WHEEL SPEED CIRCUITS FOR AN OPEN (Continued)

ABS Module Circuit Wheel SpeedSensor

DTC C1234 — Wheel Speed Sensor RF Input Circuit Failure

C135-3 VCA05 (GY/VT) C160-1

C135-4 RCA19 (VT) C160-2

DTC C1233 — Wheel Speed Sensor LF Input Circuit Failure

C135-27 VCA03 (VT/WH) C150-1

C135-28 RCA17 (YE) C150-2

DTC C1235 — Wheel Speed Sensor RR Input Circuit Failure

C135-11 VCA06 (WH/OG) C3117-1

C135-10 RCA20 (BN) C3116-2

DTC C1236 — Wheel Speed Sensor LR Input Circuit Failure

C135-36 VCA04 (BU/OG) C3116-1

C135-35 RCA18 (BN/GN) C3116-2


E12 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect all ABS connectors.• Check for:


• Connect all the ABS connectors and make sure they seat correctly.• Operate the system and verify the concern is still present.• Is the concern still present?

YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. TEST thesystem for normal operation.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. CLEAR the DTCs. REPEAT the self-test.

Pinpoint Test F: DTC C1277 and C1278Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe steering wheel rotation sensor monitors the steering wheel position when the toothed-wheel on the steering shaft passes through the optical field of thesensor.

The steering wheel rotation sensor receives fused ignition voltage from Smart Junction Box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground forthe sensor is provided by the ABS module along circuit RCS02 (BU/WH). Steering wheel rotation (in degrees) is sent from the sensor to the ABS modulealong circuits VCS06 (GY/BN) and VCS07 (VT/OG).


2010 Mustang, 10/2009

• DTC C1277 (Steering Wheel Angle 1 and 2 Circuit Failure) — If during normal operation or the on-demand self test the ABS module detects an opencircuit, short to voltage or short to ground along circuit VCS06 (GY/BN) or VCS07 (VT/OG), DTC C1277 will be set. An internal failure of thesteering wheel rotation sensor may also cause DTC C1277 to set.

• DTC C1278 (Steering Wheel Angle 1 and 2 Signal Faulted) — If, during normal operation or the on-demand self test, the ABS module does notreceive the steering wheel rotation sensor input or if the input received does not agree with the input from other sensors, DTC C1278 will be set.



• Steering wheel rotation sensor

• ABS module

PINPOINT TEST F: DTC C1277 AND C1278NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

NOTICE: Overtightening of the steering wheel rotation sensor fasteners may deform or damage the sensor housing, possibly resulting in faulty operation.

NOTE: Make sure that the steering wheel rotation sensor is mounted securely to the column with 2 fasteners. A loose sensor or missing fastener may result inincorrect sensor operation. Examine the sensor/disk interface to make sure that the disk rotates freely within the slot of the sensor. Examine the disk forphysical damage or blocked holes near the disk perimeter. Make sure that the sensor connector is mated securely to the harness connector. Beforeproceeding with electrical testing, make sure that the vehicle battery is fully charged.


F1 CHECK THE STEERING WHEEL ROTATION SENSOR INSTALLATION

• Verify that the steering wheel rotation sensor is mounted correctly andboth fasteners are installed.

• Verify that the sensor disc is in good condition and free ofobstructions and foreign materials.

• Are the sensor and disc installed correctly and in goodcondition?

YesGO to F2.

NoCLEAN the disc and/or INSTALL a new sensor orfastener(s) as necessary. REFER to Steering WheelRotation Sensor in this section.CLEAR the DTCs. DRIVE the vehicle above 48 km/h(30 mph) with input from the steering wheel rotationsensor. CARRY OUT the self-test with the brake pedalnot applied.

F2 CHECK THE ABS HARNESS AND MODULE FOR WATER INTRUSION

• Ignition OFF.• Disconnect: ABS Module C135.• Inspect the ABS module connector and module for water intrusion.• Is there any evidence of water entry or corrosion?

YesCLEAN the connector and dry it out with low-pressurecompressed air. INSPECT for evidence of water entryand repair as necessary. CLEAR the DTCs. CARRYOUT the self-test with the brake pedal not applied.

NoGO to F3.

F3 CALIBRATE THE ABS MODULE

• Connect: ABS Module C135.• Connect the scan tool.• Ignition ON.• Using the scan tool, clear the ABS module DTCs.• Using the scan tool, carry out the IVD Initialization sequence.• Test drive the vehicle above 48 km/h (30 mph) with input from the

steering wheel rotation sensor.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Are any DTCs retrieved or does the calibration procedure

indicate a fault?

YesIf DTC C1278 is retrieved or the IVD Initializationsequence indicates a fault, GO to F4.If any other DTCs are retrieved, GO to the ABS ModuleDTC Chart in this section.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector.

F4 MONITOR THE STEERING WHEEL ANGLE POSITION (SWA_POS) PID

• Enter the following diagnostic mode on the scan tool: DataLogger —ABS Module.

• Monitor the SWA_POS PID while rotating the steering wheelclockwise and counterclockwise very slowly.

• Do the PIDs move in intervals of 1.5 degrees?

YesCLEAR the DTCs. DRIVE the vehicle above 48 km/h(30 mph) with input from the steering wheel rotationsensor. RETRIEVE the DTCs.If DTC C1278 is still present, GO to F12.


2010 Mustang, 10/2009

PINPOINT TEST F: DTC C1277 AND C1278 (Continued)F4 MONITOR THE STEERING WHEEL ANGLE POSITION (SWA_POS) PID (Continued)

NoGO to F5.

F5 CHECK FOR VOLTAGE TO THE STEERING WHEEL ROTATION SENSOR

• Ignition OFF.• Disconnect: Steering Wheel Rotation Sensor C226.• Ignition ON.• Measure the voltage between steering wheel rotation sensor C226-4,

circuit CBP34 (VT/BN), harness side and ground.


YesGO to F6.

NoVERIFY SJB fuse 34 (5A) is OK. If OK, REPAIR circuitCBP34 (VT/BN). If not OK, REFER to the WiringDiagrams manual to locate the source of the circuitshort. Using the scan tool, CARRY OUT the IVDInitialization sequence. CLEAR the DTCs. CARRYOUT the self-test with the brake pedal not applied.

F6 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITS FOR AN OPEN

• Ignition OFF.• Disconnect: ABS Module C135.• Measure the resistance between:

— ABS module C135-37, circuit VCS07 (VT/OG), harness side andsteering wheel rotation sensor C226-3, circuit VCS07 (VT/OG),harness side.

— ABS module C135-12, circuit VCS06 (GY/BN), harness side andsteering wheel rotation sensor C226-2, circuit VCS06 (GY/BN),harness side.

— ABS module C135-34, circuit RCS02 (BU/WH), harness side andsteering wheel rotation sensor C226-1, circuit RCS02 (BU/WH),harness side.


YesGO to F7.

NoREPAIR the affected circuit(s). Using the scan tool,CARRY OUT the IVD Initialization sequence. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

F7 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

• Ignition ON.• Measure the voltage between ground and:

— ABS module C135-37, circuit VCS07 (VT/OG), harness side.— ABS module C135-12, circuit VCS06 (GY/BN), harness side.— ABS module C135-34, circuit RCS02 (BU/WH), harness side.

YesREPAIR the affected circuit(s). Using the scan tool,CARRY OUT the IVD Initialization sequence. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

NoGO to F8.


2010 Mustang, 10/2009

PINPOINT TEST F: DTC C1277 AND C1278 (Continued)F7 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE (Continued)


F8 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITS FOR A SHORT TO GROUND


— ABS module C135-37, circuit VCS07 (VT/OG), harness side.— ABS module C135-12, circuit VCS06 (GY/BN), harness side.— ABS module C135-34, circuit RCS02 (BU/WH), harness side.


YesGO to F9.

NoREPAIR the affected circuit(s). Using the scan tool,CARRY OUT the IVD Initialization sequence. CLEARthe DTCs. CARRY OUT the self-test with the brakepedal not applied.

F9 CHECK THE STEERING WHEEL ROTATION SENSOR SIGNAL 1 OUTPUT

NOTICE: This pinpoint test step directs testing circuits using a back-probemethod. Use the special back-probe tool specified in the tool list inthis section. Do not force test leads or other probes into connectors.Adequate care must be exercised to avoid connector terminaldamage while making sure that good electrical contact is made withthe circuit or terminal. Failure to follow these instructions may causedamage to wiring, terminals or connectors and subsequent electricalfaults.

• Connect: ABS Module C135.• Connect: Steering Wheel Rotation Sensor C226.• Ignition ON.• With C226 connected, backprobe the connector to measure the

voltage between steering wheel rotation sensor C226-2, circuitVCS06 (GY/BN), harness side and steering wheel rotation sensorC226-1, circuit RCS02 (BU/WH), harness side while rotating thesteering wheel slightly.

YesGO to F10.

NoGO to F11.


2010 Mustang, 10/2009

PINPOINT TEST F: DTC C1277 AND C1278 (Continued)F9 CHECK THE STEERING WHEEL ROTATION SENSOR SIGNAL 1 OUTPUT (Continued)

• Is the voltage between 0.25 volt and 0.75 volt or between 4.00volts and 4.75 volts with the steering wheel stationary andchange to the other state when rotating the steering wheelslightly?

F10 CHECK THE STEERING WHEEL ROTATION SENSOR SIGNAL 2 OUTPUT

NOTICE: This pinpoint test step directs testing circuits using a back-probemethod. Use the special back-probe tool specified in the tool list inthis section. Do not force test leads or other probes into connectors.Adequate care must be exercised to avoid connector terminaldamage while making sure that good electrical contact is made withthe circuit or terminal. Failure to follow these instructions may causedamage to wiring, terminals or connectors and subsequent electricalfaults.

• With C226 connected, backprobe the connector to measure thevoltage between the steering wheel rotation sensor C226-3, circuitVCS07 (VT/OG), harness side and the steering wheel rotation sensorC226-1, circuit RCS02 (BU/WH), harness side while rotating thesteering wheel slightly.

• Is the voltage between 0.25 volt and 0.75 volt or between 4.00volts and 4.75 volts with the steering wheel stationary andchange to the other state when rotating the steering wheelslightly?

YesGO to F12.

NoGO to F11.

F11 CHECK FOR STEERING WHEEL ROTATION SENSOR REFERENCE VOLTAGE

• Ignition OFF.• Disconnect: Steering Wheel Rotation Sensor C226.• Ignition ON.• Measure the voltage between steering wheel rotation sensor C226-1,

circuit RCS02 (BU/WH), harness side and:— steering wheel rotation sensor C226-2, circuit VCS06 (GY/BN),

harness side.— steering wheel rotation sensor C226-3, circuit VCS07 (VT/OG),

harness side.

YesINSTALL a new steering wheel rotation sensor. REFERto Steering Wheel Rotation Sensor in this section.CLEAR the DTCs. CARRY OUT the self-test with thebrake pedal not applied.

NoGO to F12.


2010 Mustang, 10/2009

PINPOINT TEST F: DTC C1277 AND C1278F11 CHECK FOR STEERING WHEEL ROTATION SENSOR REFERENCE VOLTAGE (Continued)

• Are the voltages between 4.75 volts and 5.25 volts?

F12 CHECK FOR CORRECT ABS MODULE OPERATION







Pinpoint Test G: DTC C1963Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe ABS module uses information received from several sensors (wheel speed sensors, steering wheel rotation sensor, stability control sensors, etc.) todetermine if vehicle stability or traction warrants Electronic Stability Control (ESC) interaction. If interaction is warranted, the ABS module will adjustbrake torque at specific wheels and the PCM will reduce engine torque to make the vehicle more stable. Once the ABS module has determined that thestability event has been corrected, it will return brake and engine torque to normal and continue to monitor the vehicle.

If conditions exist during normal operation that prevent the ESC system from operating, DTC C1963 will be set. This DTC is usually set due to the steeringwheel rotation sensor or the Restraints Control Module (RCM) being damaged or installed incorrectly. This DTC will not clear until the vehicle has beendriven above 48 km/h (30 mph) with input from the steering wheel rotation sensor.

• DTC C1963 (Stability Control Inhibit Warning) — Once every key-cycle the ABS module will determine the straight-ahead or center position of thesteering wheel by monitoring the steering wheel rotation sensor while the vehicle is being driven. If the vehicle reaches a speed of 75 km/h (47 mph)without finding the center position or if 30 seconds has passed since the initial drive-off without finding the center position, DTC C1963 will set.



• Stability control sensors

• Wheel speed sensors

• ABS module

PINPOINT TEST G: DTC C1963Test Step Result / Action to Take

G1 CHECK FOR ABS MODULE DTCs

• Review the DTCs retrieved during Inspection and Verification.• Are any ABS module DTCs other than C1963 present?

YesREPAIR all other DTCs before repairing C1963. GO tothe ABS Module DTC Chart in this section.

NoGO to G2.


2010 Mustang, 10/2009

PINPOINT TEST G: DTC C1963 (Continued)G2 CHECK RETURNING DTCs

• Connect the scan tool.• Ignition ON.• Using the scan tool, clear the ABS module DTCs.• Cycle the ignition switch from RUN to OFF and back to RUN.• Test drive the vehicle above 75 km/h (47 mph).• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module .• Are any ABS module DTCs present?

YesIf only C1963 is present, GO to G3.If DTC C1963 is present along with other DTCs,REPAIR the other DTCs before repairing DTC C1963.GO to the ABS Module DTC Chart in this section.

NoThe condition is not present at this time. INSPECT thesteering wheel rotation sensor and the slotted-wheel forcracks, looseness and foreign material. REPAIR orINSTALL new as necessary. CLEAR the DTCs.CARRY OUT the IVD Initialization sequence. REPEATthe self-test.

G3 CHECK THE WHEEL SPEED SENSOR PIDs

• Enter the following diagnostic mode on the scan tool: DataLogger —ABS Module .

• While driving the vehicle, have an assistant monitor the followingwheel speed sensor PIDs:— Left Front Wheel Speed Sensor (LF_WSPD)— Right Front Wheel Speed Sensor (RF_WSPD)— Left Rear Wheel Speed Sensor (LR_WSPD)— Right Rear Wheel Speed Sensor (RR_WSPD)

• Do all the PIDs match the vehicle speed and match each other?

YesGO to G7.

NoGO to G4.

G4 INSPECT THE WHEEL SPEED SENSOR MOUNTING

• Ignition OFF.• With the vehicle in NEUTRAL, position it on a hoist. Refer to Section

100-02.• Verify the bolt of the suspect wheel speed sensor is tightened to

specifications.• Is the bolt tightened to specifications?

YesGO to G5.

NoTIGHTEN the wheel speed sensor bolt to specification.REFER to Specifications in this section. CLEAR theDTCs. REPEAT the self-test.

G5 INSPECT THE WHEEL SPEED SENSOR AND HARNESS FOR DAMAGE

• NOTE: Examine the wheel speed sensor harness carefully with a good lightsource. Failure to verify damage in the sensor harness can lead tounnecessary installation of a new component.

Inspect the suspect wheel speed sensor and harness for cuts, brokentabs, broken casing or corrosion.

• Are the wheel speed sensor and harness OK?

YesGO to G6.

NoINSTALL a new wheel speed sensor. REFER to WheelSpeed Sensor — Front or Wheel Speed Sensor —Rear in this section. CLEAR the DTCs. REPEAT theself-test.

G6 INSPECT THE WHEEL SPEED SENSOR RING FOR DAMAGE

• NOTE: Examine the wheel speed sensor ring carefully with a good lightsource. Failure to verify damage in the sensor ring can lead tounnecessary installation of a new component.

Inspect the suspect wheel speed sensor ring for cracks, chips ormissing teeth. Rotate the wheel to verify that no teeth are missing.

• Is the wheel speed sensor ring OK?

YesGO to G7.

NoINSTALL a new wheel speed sensor ring. For frontwheel speed sensor rings, REFER to Wheel SpeedSensor Ring — Front in this section. For rear wheelspeed sensor rings, REFER to Wheel Speed SensorRing — Rear in this section. CLEAR the DTCs.REPEAT the self-test.

G7 CHECK THE ABS MODULE YAW RATE (YAW_RATE) PID

• Turn the ignition on, if not previously done.• NOTE:

The vehicle must be on level ground and at a complete standstill. Anyvehicle movement results in false values for this test.

Monitor the YAW_RATE PID.• Is the YAW_RATE PID value between -0.05 and 0.05?

YesGO to G8.

NoGO to G10.

G8 CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_ACCL) PID


2010 Mustang, 10/2009

PINPOINT TEST G: DTC C1963 (Continued)G8 CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_ACCL) PID (Continued)

• NOTE: The vehicle must be on level ground and at a complete standstill. Anyvehicle movement results in false values for this test.

Monitor the LAT_ACCL PID.• Is the LAT_ACCL PID value between -0.100 and 0.100?

YesGO to G9.

NoGO to G10.

G9 CHECK THE ABS MODULE LONGITUDINAL ACCELERATION (LONG_ACCL) PID

• NOTE: The vehicle must be on level ground and at a complete standstill. Anyvehicle movement results in false values for this test.

Monitor the LONG_ACCL PID.• Is the LONG_ACCL PID value between -0.250 and 0.250?

YesGO to G11.

NoGO to G10.

G10 CHECK THE RCM INSTALLATION AND MOUNTING SURFACE

• Ignition OFF.• Depower the Supplemental Restraint System (SRS). Refer to

Supplemental Restraint System (SRS) Depowering and Repoweringin Section 501-20B.

• After depowering the system, refer to RCM removal and installation inSection 501-20B. Adhere to all safety warnings in the procedure whileinspecting the RCM for damage or incorrect mounting.

• Inspect the RCM installation and make sure that the nuts are fullyseated and tightened correctly. Refer to RCM in Section 501-20B.

• Inspect the mounting surface for damage, corrosion or debris.• Is the RCM installed correctly and is the mounting surface clean

and free from damage?

YesGO to G14.

NoREPAIR or INSTALL a new RCM as necessary.CLEAR the DTC. Using the scan tool, CARRY OUT theIVD Initialization sequence. CLEAR the DTCs.REPEAT the self-test.

G11 CHECK THE STEERING WHEEL ROTATION SENSOR POSITION (SWA POS) PID

• Monitor the SWA POS PID while rotating the steering wheel clockwiseand counterclockwise very slowly, from lock to lock.

• Does the PID change in intervals of 1.5 degrees and show a 360degree increase for each complete revolution of the steeringwheel?

YesGO to G13.

NoGO to G12.

G12 INSPECT THE STEERING WHEEL ROTATION SENSOR

• Inspect the steering wheel rotation sensor and tone ring installationand make sure that fasteners are fully seated and tightened correctly.Refer to Steering Wheel Rotation Sensor in this section.

• Inspect the steering wheel rotation sensor tone ring for damage ordebris.

• Is the steering wheel rotation sensor and tone ring installedcorrectly, clean and free from damage?

YesGO to G13.

NoREPAIR, CLEAN or INSTALL a new steering wheelrotation sensor and/or tone ring as necessary. CLEARthe DTC. Using the scan tool, CARRY OUT the IVDInitialization sequence. CLEAR and DTCs. REPEATthe self-test.

G13 CHECK FOR CORRECT ABS MODULE OPERATION



• Connect: ABS Module C135.• Make sure the ABS module electrical connector is fully seated, then

operate the system and verify the concern is still present.• Is the concern still present?



G14 CHECK FOR ADDITIONAL ABS MODULE DTCs

•WARNING:

Turn the ignition OFF and wait one minute to deplete the backuppower supply. Failure to follow this instruction may result in

YesINSTALL a new RCM. REFER to Section 501-20B.Using the scan tool, CARRY OUT the IVD Initializationsequence. CLEAR the DTCs. REPEAT the self-test.


2010 Mustang, 10/2009

PINPOINT TEST G: DTC C1963 (Continued)G14 CHECK FOR ADDITIONAL ABS MODULE DTCs (Continued)

serious personal injury or death in the event of an accidentaldeployment.

• Reconnect all SRS components (if previously disconnected).— If previously directed to depower the SRS, repower the SRS. Do

not prove out the SRS at this time. Refer to SupplementalRestraint System (SRS) Depowering and Repowering in Section501-20B.

• Ignition ON.• Enter the following diagnostic mode on the scan tool: Self Test —

Clear All CMDTCs.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Is DTC C1963 present?


Pinpoint Test H: DTC C1288

Normal OperationThe brake pedal pressure transducer is integral to the Hydraulic Control Unit (HCU). The transducer sends a signal to the ABS module that varies in relationto the amount of pressure applied to the brake pedal. The more pressure that is applied, the greater the signal sent to the ABS module. If a new transducerneeds to be installed, then a new HCU must be installed.

• DTC C1288 (Pressure Transducer Main/Primary Input Circuit Failure) — The pressure transducer signal sent to the ABS module is checked againstother ABS module brake pedal inputs and if it does not agree with those inputs, DTC C1288 is set. Also, if the transducer is open, shorted to ground orshorted to voltage, DTC C1288 will be set.


• HCU

• ABS module

PINPOINT TEST H: DTC C1288NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.


H1 MONITOR THE PCM BRAKE ON/OFF (BOO) PID

• Connect the scan tool.• Ignition ON.• Enter the following diagnostic mode on the scan tool: DataLogger —

PCM.• Press and release the brake pedal while monitoring the BOO PID.• Does the PID switch to ON with the brake pedal pressed and then

to OFF with the brake pedal released?

YesGO to H2.

NoRETRIEVE any PCM DTCs. REFER to the PowertrainControl/Emissions Diagnosis (PC/ED) manual for non-communication DTCs and REFER to Section 418-00for any communication DTCs.

H2 MONITOR THE ABS MODULE MASTER CYLINDER PRESSURE (MC_PRES) PID

NOTE: To obtain the most accurate reading, it is recommended to use a graph display forthis PID.

NOTE: Residual pressure may be present in the brake lines, contributing to a possibledata spike within the first second of brake pedal application. This is a normalcondition.


• Steadily press and release the brake pedal while monitoring theMC_PRES PID.

• Does the PID smoothly increase with firm pressure on the brakepedal and then smoothly decrease with the brake pedal released,without any spikes in the data?

YesGO to H3.

NoGO to H4.


2010 Mustang, 10/2009

PINPOINT TEST H: DTC C1288 (Continued)H3 ROAD TEST THE VEHICLE AND MONITOR THE ABS MODULE MC_PRES PID WHILE DRIVING THE VEHICLE



• Road test the vehicle and have an assistant monitor the MC_PRESPID.


YesThe system is operating correctly at this time. CLEARthe DTCs. REPEAT the self-test.

NoGO to H4.

H4 ISOLATE THE HCU


• Install a new HCU. Refer to Hydraulic Control Unit (HCU) in thissection. Calibrate the ABS module. Follow the scan tool directions forthe calibration procedure.


• Steadily press and release the brake pedal while monitoring theMC_PRES PID.


YesThe concern has been corrected. RETURN the vehicleto the customer.

NoINSTALL a new ABS module, REFER to Anti-LockBrake System (ABS) Module in this section. CLEARthe DTCs. REPEAT the self-test with the brake pedalnot applied.

Pinpoint Test I: DTC C1446Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe ABS module receives the brake fluid level information and the Brake Pedal Position (BPP) switch information over the High Speed Controller AreaNetwork (HS-CAN) bus. The PCM provides the BPP switch information and the Instrument Panel Cluster (IPC) provides the brake fluid level information.

The BPP switch is also known as the stoplamp switch.

• DTC C1446 (Brake Switch Circuit Failure) — If, during normal operation or the on-demand self test, the ABS module does not receive the brake fluidlevel message and/or the BPP switch message, or if the BPP switch message is inconsistent with other sensor information, DTC C1446 will be set.



• BPP switch

• IPC

• PCM

PINPOINT TEST I: DTC C1446Test Step Result / Action to Take

I1 CHECK THE RED BRAKE WARNING INDICATOR OPERATION

• Monitor the red brake warning indicator in the IPC.• Ignition OFF.• Ignition ON.• Verify the red brake warning indicator illuminates for a few seconds

and then extinguishes.• Does the warning indicator illuminate for a few seconds and then

extinguish?

YesGO to I2.

NoREFER to Section 413-01 to diagnose the red brakewarning indicator.

I2 CHECK THE STOPLAMP OPERATION

• Verify the stoplamps operate correctly while pressing and releasingthe brake pedal.

YesGO to I3.


2010 Mustang, 10/2009

PINPOINT TEST I: DTC C1446 (Continued)I2 CHECK THE STOPLAMP OPERATION (Continued)

• Do the stoplamps operate correctly? NoREFER to Section 417-01 to diagnose the stoplamps.

I3 CHECK THE ABS MODULE DTCs

• Review the ABS module DTCs retrieved during Inspection andVerification.

• Are any communication (U-code) DTCs present?

YesGO to the ABS Module DTC Chart in this section anddiagnose the U-code DTCs.

NoGO to I4.

I4 CHECK THE PCM FOR DTCs

• Connect the scan tool.• Ignition ON.• Enter the following diagnostic mode on the scan tool: Self Test —

PCM.• Retrieve and record the PCM DTCs.• Are any DTCs present in the PCM?

YesREFER to the Powertrain Control/Emissions Diagnosis(PC/ED) manual to diagnose the PCM.

NoGO to I5.

I5 MONITOR THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID


• Press and release the brake pedal while monitoring the BOO_ABSPID.

• Does the PID display ON with the brake pedal applied and OFFwith the brake pedal released?

YesThe system is operating correctly at this time. CLEARthe DTCs. REPEAT the self-test.

NoGO to I6.

I6 MONITOR THE PCM BOO PID

• Enter the following diagnostic mode on the scan tool: DataLogger —PCM.

• Press and release the brake pedal while monitoring the BOO PID.• Does the PID display ON with the brake pedal applied and OFF

with the brake pedal released?

YesREFER to Section 418-00 to diagnose the HS-CANbus.

NoREFER to Section 417-01 to diagnose the stoplampswitch.

Pinpoint Test J: DTC C1991

Normal OperationThe ABS module needs to be calibrated whenever a component specific to the Electronic Stability Control (ESC) system is disconnected or a newcomponent is installed. Calibration allows the ABS module to identify the "zero position" of the sensors so the system will operate correctly.

• DTC C1991 (Module Calibration Failure) — If the IVD Initialization sequence does not finish or if the ABS module loses the calibration information,DTC C1991 will set.


• ABS module

• Restraints Control Module (RCM)


PINPOINT TEST J: DTC C1991NOTE: The stability/traction control indicator (also known as the sliding-car icon) will flash when a system calibration is required. Calibration is required aftercertain DTCs are cleared.

NOTE: The vehicle must be on level ground, at a complete standstill, in NEUTRAL with the brakes applied, and not on a hoist while carrying out the calibrationprocedure. Any vehicle movement will result in calibration failure.


J1 CHECK FOR ABS MODULE DTCs

• Connect the scan tool.• Ignition ON.

YesDIAGNOSE all other DTCs first. GO to the ABS ModuleDTC Chart in this section.


2010 Mustang, 10/2009

PINPOINT TEST J: DTC C1991 (Continued)Test Step Result / Action to Take

J1 CHECK FOR ABS MODULE DTCs (Continued)• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Retrieve and record any ABS module DTCs.• Is any other DTC retrieved with C1991?

NoGO to J2.

J2 CALIBRATE THE ABS MODULE

• Using the scan tool, carry out the IVD Initialization sequence. Followthe scan tool instructions.

• Does the IVD Initialization sequence complete for all of thestability sensors and does the sliding-car icon stop flashing andturn off?

YesGO to J3.

NoGO to J4.

J3 CHECK FOR RETURNING DTCs

• Using the scan tool, clear the ABS module DTCs.• Ignition OFF.• Ignition ON.• Enter the following diagnostic mode on the scan tool: Self Test —

ABS Module.• Retrieve and record any ABS module DTCs.• Does the DTC C1991 clear and not return?

YesThe calibration is complete. The concern may havebeen caused by an incorrect or incomplete calibration.

NoGO to J4.

J4 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect: ABS Module C135.• Check ABS C135 for:

— corrosion.— spread terminals.— pushed-out pins.

• Connect: ABS Module C135.• Make sure the connector seats properly, then operate the system and

verify the concern is still present.• Is the concern still present?

YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. CLEARthe DTCs. REPEAT the self-test.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

Pinpoint Test K: DTCs C1279, C1281 and U0074Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe yaw rate sensor, lateral accelerometer and longitudinal accelerometer are contained in Restraints Control Module (RCM). The RCM measures vehicleyaw rate, roll rate, lateral acceleration and longitudinal acceleration and then sends the information to the ABS module along a dedicated Controller AreaNetwork (CAN), circuits VCA23 (BU/WH) and VCA24 (GN/OG). This dedicated CAN is used only for communication between the RCM and the ABSmodule. The information sent to the ABS module is used to help determine if the AdvanceTrac® system needs to be activated.


• C1279 — Yaw Rate Sensor Circuit Failure• C1281 — Lateral Accelerometer Circuit Failure

If, during normal operation or the ABS module on-demand self test, theABS module detects an open circuit, a short to voltage or a short to groundon one or both of the dedicated CAN circuits, the appropriate DTC will beset. Also, a failure of the RCM will cause the appropriate DTC to set.

• U0074 — Control Module Communication Bus B Off The ABS module continually looks for the sensor information from theRCM. If the ABS stops receiving the information, it will flag DTC U0074 ifthe information does not return within 5 seconds. An open, a short to poweror short to ground in one of the dedicated CAN circuits or an internal failureof the RCM can cause the information to be missing.



• RCM incorrectly mounted

• RCM

• ABS module


2010 Mustang, 10/2009

PINPOINT TEST K: DTCs C1279, C1281 AND U0074

WARNING:Never probe the electrical connectors on air bag, Safety Canopy® or side air curtain modules. Failure to follow this instruction may result in theaccidental deployment of these modules, which increases the risk of serious personal injury or death.

WARNING:Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe theelectrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners, adaptive loadlimiting retractors, or safety belt inflators, which increases the risk of serious personal injury or death.

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

NOTE: Supplemental Restraint System (SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint teststep. Failure to follow this instruction may result in incorrect diagnosis of the SRS.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.


K1 CHECK FOR AN HS-CAN CONCERN WITH THE RCM

• Connect the scan tool.• Ignition ON.• NOTE:

The Network Test does not test the dedicated CAN communicationsbetween the ABS module and RCM. The dedicated CAN is adedicated communication network between the 2 modules.

Using the scan tool, carry out the Network Test.• Does the RCM pass the Network Test?

YesGO to K2.

NoREFER to Section 418-00 to diagnose the HS-CANconcern.

K2 CHECK FOR CORRECT RCM

• Ignition OFF.• Depower the SRS. Refer to Supplemental Restraint System (SRS)

Depowering and Repowering in Section 501-20B.• Gain access to the RCM and check the part number on the RCM

against the part number listed in the master parts catalog. Refer toSection 501-20B.

• Does the part number on the RCM match the part number listedin the master parts catalog?

YesGO to K3.

NoINSTALL the correct RCM. REFER to Section501-20B.

K3 CHECK FOR CORRECT ABS MODULE

• Repower the SRS. Refer to Supplemental Restraint System (SRS)Depowering and Repowering in Section 501-20B.

• Enter the following diagnostic mode on the scan tool: Log Viewer.• Retrieve and record the ABS module part number from Log Viewer

and check the part number on the ABS module against the partnumber listed in the master parts catalog.

• Does the part number retrieved from the ABS module match thepart number listed in the master parts catalog?

YesGO to K4.

NoINSTALL the correct ABS module. REFER to Anti-LockBrake System (ABS) Module in this section.

K4 CHECK THE RCM CONDITION AND INSTALLATION

• Ignition OFF.• Depower the SRS. Refer to Supplemental Restraint System (SRS)

Depowering and Repowering in Section 501-20B.• After depowering the system, refer to Section 501-20B. Adhere to all

safety warnings in the procedure while inspecting the RCM fordamage or incorrect mounting.

• Inspect the RCM for cracks in the case, broken anchor tabs, brokenelectrical connector and correct installation. Refer to Removal andInstallation, Restraints Control Module (RCM) in Section 501-20B.

• Is the RCM installed correctly and undamaged?

YesGO to K5.

NoREINSTALL or INSTALL new as necessary. REFER toSection 501-20B.

K5 CHECK THE CAN CIRCUITS FOR AN OPEN

• Disconnect: ABS Module C135.• Disconnect: RCM C2041A and C2041B.

YesGO to K6.


2010 Mustang, 10/2009

PINPOINT TEST K: DTCs C1279, C1281 AND U0074 (Continued)K5 CHECK THE CAN CIRCUITS FOR AN OPEN (Continued)

• Measure the resistance between the ABS module C135, harness sideand the RCM C2041B, harness side as indicated in the followingchart:

RCM Circuit ABS Module

C2041B-20 VCA23 (BU/WH) C135-8

C2041B-19 VCA24 (GN/OG) C135-9


NoREPAIR the affected circuit(s). CLEAR the DTCs.CYCLE the ignition key. REPEAT the self-test.

K6 CHECK THE CAN CIRCUITS FOR A SHORT TO GROUND

• Measure the resistance between ground and:— ABS module C135-9, circuit VCA24 (GN/OG), harness side.— ABS module C135-8, circuit VCA23 (BU/WH), harness side.


YesGO to K7.

NoREPAIR the affected circuit(s). TEST the system fornormal operation.

K7 CHECK THE CAN CIRCUITS FOR A SHORT TOGETHER

• Measure the resistance between ABS module C135-9, circuit VCA24(GN/OG), harness side and ABS module C135-8, circuit VCA23 (BU/WH), harness side.

YesGO to K8.

NoREPAIR the affected circuit(s). TEST the system fornormal operation.


2010 Mustang, 10/2009

PINPOINT TEST K: DTCs C1279, C1281 AND U0074 (Continued)K7 CHECK THE CAN CIRCUITS FOR A SHORT TOGETHER (Continued)


K8 CHECK THE CAN CIRCUITS FOR A SHORT TO VOLTAGE

• Repower the SRS. Refer to Supplemental Restraint System (SRS)Depowering and Repowering in Section 501-20B.

• Ignition ON.• Measure the voltage between ground and:

— ABS module C135-9, circuit VCA24 (GN/OG), harness side.— ABS module C135-8, circuit VCA23 (BU/WH), harness side.


YesREPAIR the affected circuit(s). TEST the system fornormal operation.

NoGO to K9.

K9 CHECK FOR CORRECT RCM OPERATION

• Depower the SRS. Refer to Supplemental Restraint System (SRS)Depowering and Repowering in Section 501-20B.

• Check RCM C2041A and C2041B for:

— corrosion— pushed-out pins— spread terminals

• Connect: RCM C2041A and C2041B.• Connect: ABS Module C135.• Make sure the connectors are seated correctly.• Repower the SRS. Refer to Section 501-20B.• Operate the system, verify the concern is still present.• Is the concern still present?

YesINSTALL a new RCM. REFER to Section 501-20B.CLEAR the DTCs. REPEAT the self-test.If DTCs C1279, C1281, U0074, are retrieved again GOto K10.


K10 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect: ABS module C135.• Check for:

— corrosion— pushed-out pins— spread terminals

• Connect: ABS module C135.• Make sure the connector is seated correctly, then operate the system

and verify the concern is still present.

YesINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module. TEST the system fornormal operation.



2010 Mustang, 10/2009

PINPOINT TEST K: DTCs C1279, C1281 AND U0074 (Continued)K10 CHECK FOR CORRECT ABS MODULE OPERATION (Continued)

• Is the concern still present?

Pinpoint Test L: The Traction Control System Cannot Be Disabled/Enabled or the Traction Control System is InoperativeRefer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationThe Instrument Panel Cluster (IPC) sends 5 volts to the traction control switch along circuit CCA15 (YE/GY). When the traction control switch is pressed,this voltage is sent through the switch and to ground along circuit GD116 (BK/VT). When the IPC detects this ground, it sends a message to the PCM andthe ABS module along the High Speed Controller Area Network (HS-CAN) bus, indicating that the driver has disabled the system. An open circuit or adefective traction control switch will prevent the system from being disabled, but will not set a DTC.



• Traction control switch

• IPC

• HS-CAN bus

PINPOINT TEST L: THE TRACTION CONTROL SYSTEM CANNOT BE DISABLED/ENABLED ORTHE TRACTION CONTROL SYSTEM IS INOPERATIVE

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.


L1 CHECK FOR DTCs

• Check for any ABS module, IPC or PCM DTCs.• Are any DTCs present?

YesFor ABS module DTCs, REFER to the ABS ModuleDTC Chart in this section.For PCM DTCs, REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.For IPC DTCs, REFER to Section 413-01.

NoGO to L2.

L2 CHECK THE TRACTION CONTROL SWITCH

• Disconnect: Traction Control Switch C2267.• Measure the resistance between traction control switch C2267 pin-1,

component side, and traction control switch C2267 pin-7, componentside while pressing and releasing the switch.

• Is the resistance greater than 10,000 ohms with the switchreleased and less than 5 ohms with the switch pressed?

YesGO to L3.

NoINSTALL a new traction control switch. REFER toStability/Traction Control Switch in this section. TESTthe system for normal operation.

L3 CHECK THE TRACTION CONTROL SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

• Ignition OFF.• Disconnect: IPC C220.• Ignition ON.• Measure the voltage between traction control switch C2267-7, circuit

CCA15 (YE/GY), harness side and ground.

YesREPAIR circuit CCA15 (YE/GY). TEST the system fornormal operation.

NoGO to L4.


2010 Mustang, 10/2009

PINPOINT TEST L: THE TRACTION CONTROL SYSTEM CANNOT BE DISABLED/ENABLED ORTHE TRACTION CONTROL SYSTEM IS INOPERATIVE (Continued)

L3 CHECK THE TRACTION CONTROL SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE (Continued)


L4 CHECK THE TRACTION CONTROL SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

• Ignition OFF.• Measure the resistance between traction control switch C2267-7,

circuit CCA15 (YE/GY), harness side and ground.

• Is the resistance greater than 10,000 ohms?

YesGO to L5.

NoREPAIR circuit CCA15 (YE/GY). TEST the system fornormal operation.

L5 CHECK THE TRACTION CONTROL SWITCH GROUND CIRCUIT FOR AN OPEN

• Ignition OFF.• Measure the resistance between traction control switch C2267-1,

circuit GD116 (BK/VT), harness side and ground.

• Is the resistance less than 5 ohms?

YesGO to L6.

NoREPAIR circuit GD116 (BK/VT). TEST the system fornormal operation.

L6 CHECK TRACTION CONTROL SWITCH SIGNAL CIRCUIT FOR AN OPEN

• Measure the resistance between IPC C220-7, circuit CCA15 (YE/GY),harness side and traction control switch C2267-1, circuit CCA15 (YE/GY), harness side.

YesGO to L7.

NoREPAIR circuit CCA15 (YE/GY). TEST the system fornormal operation.


2010 Mustang, 10/2009

PINPOINT TEST L: THE TRACTION CONTROL SYSTEM CANNOT BE DISABLED/ENABLED ORTHE TRACTION CONTROL SYSTEM IS INOPERATIVE (Continued)

L6 CHECK TRACTION CONTROL SWITCH SIGNAL CIRCUIT FOR AN OPEN (Continued)

• Is the resistance less than 5 ohms?

L7 CHECK FOR CORRECT IPC OPERATION

• Ignition OFF.• Check IPC C220 for:

— corrosion.— pushed-out pins.— spread terminal.

• Connect: IPC C220.• Make sure the connector is seated correctly then operate the system

and verify the concern is still present.• Is the concern still present?

YesINSTALL a new IPC. REFER to Section 413-01. TESTthe system for normal operation.

NoThe system is operating correctly at this time. Theconcern may have been caused by a loose or corrodedconnector.

Pinpoint Test M: DTC B2900Refer to Wiring Diagrams Cell 42, Vehicle Dynamic Systems for schematic and connector information.

Normal OperationWhen the ignition is turned to the RUN position, the ABS module and the PCM share Vehicle Identification Number (VIN) information over the High SpeedController Area Network (HS-CAN) bus.

• DTC B2900 (VIN Mismatched) — If the VIN information stored in the ABS module does not match the information transmitted by the PCM, DTCB2900 will set.


• Module configuration (ABS and PCM)

• ABS module

PINPOINT TEST M: DTC B2900Test Step Result / Action to Take

M1 VERIFY PCM VIN

• Connect the scan tool.• Ignition ON.• Using the scan tool, carry out the Network Test.• Enter the following diagnostic mode on the scan tool: Log Viewer.• Compare the VIN in Log Viewer to the VIN plate.• Does the VIN in Log Viewer match the VIN plate?

YesGO to M2.

NoRECONFIGURE the PCM. FOLLOW the instructionson the scan tool. CLEAR the DTCs. CYCLE the ignitionkey. REPEAT the self-test.

M2 VERIFY ABS MODULE PART NUMBER

• Retrieve and record the ABS module part number from Log Viewerand verify that the vehicle has the correct ABS module installed.

• Is the correct ABS module installed in the vehicle?

YesFor vehicles equipped with a 4.6L engine,CONFIGURE the ABS module. REFER toProgrammable Module Installation (PMI) Using theIntegrated Diagnostic System (IDS) When the Original


2010 Mustang, 10/2009

PINPOINT TEST M: DTC B2900 (Continued)M2 VERIFY ABS MODULE PART NUMBER (Continued)

Module is NOT Available in Section 418-01. CLEARthe DTC. CYCLE the ignition key. REPEAT the self-test.For all other vehicles, INSTALL a new ABS module.REFER to Anti-Lock Brake System (ABS) Module inthis section. CLEAR the DTC. CYCLE the ignition key.REPEAT the self-test.

NoINSTALL a new ABS module. REFER to Anti-LockBrake System (ABS) Module in this section. CLEARthe DTC. CYCLE the ignition key. REPEAT the self-test.


2010 Mustang, 10/2009

section 206-09 anti-lock brake system (abs) and...

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