diagnostic trouble code (dtc) charts - diesel · pdf filediagnostic trouble code (dtc) charts...

Diagnostic Trouble Code (DTC) Charts

Note: Before proceeding to the Pinpoint Test, refer to the Diagnostic Trouble Code (DTC)Descriptions for additional information to assist in diagnosis.

6.0L Diesel DTCs Chart

Diagnostic TroubleCode (DTC) Application Continuous Memory

111 ALL No errors detected112 ALL GO to Powertrain Control Module Power (PCM

PWR) Test.113 ALL GO to Powertrain Control Module Power (PCM

PWR) Test.114* ALL GO to Engine Coolant Temperature (ECT)

Sensor Test.115* ALL GO to Engine Coolant Temperature (ECT)

Sensor Test.121* ALL GO to Manifold Absolute Pressure (MAP)



Sensor Test.124* ALL GO to Injection Control Pressure (ICP) Sensor

Test.125* ALL GO to Injection Control Pressure (ICP) Sensor

Test.131* ALL GO to Accelerator Pedal Position Sensor and

Idle Validation Switch (APS/IVS) Test.132* ALL GO to Accelerator Pedal Position Sensor and




Idle Validation Switch (APS/IVS) Test.141 ALL GO to Vehicle Speed Sensor (VSS) Test.142 ALL GO to Vehicle Speed Sensor (VSS) Test.143 ALL GO to Camshaft Position (CMP) Sensor Test.145 ALL GO to Camshaft Position (CMP) Sensor Test.146 ALL GO to Crankshaft Position (CKP) Sensor Test.147 ALL GO to Crankshaft Position (CKP) Sensor Test.151* ALL GO to Barometric Absolute Pressure (BAP)

Sensor Test.152* ALL GO to Barometric Absolute Pressure (BAP)

Sensor Test.154 ALL GO to Intake Air Temperature (IAT) Sensor

Test.155 ALL GO to Intake Air Temperature (IAT) Sensor

Test.(Continued)

2004 F650/F750 6.0L Diesel




161* ALL GO to Manifold Air Temperature (MAT) SensorTest.

162* ALL GO to Manifold Air Temperature (MAT) SensorTest.

163* ALL GO to Exhaust Gas Recirculation (EGR)Actuator Test.

164* ALL GO to Exhaust Gas Recirculation (EGR)Actuator Test.

211* ALL GO to Engine Oil Pressure (EOP) SensorTest.

212* ALL GO to Engine Oil Pressure (EOP) SensorTest.

215 ALL GO to Vehicle Speed Sensor (VSS) Test.225 ALL GO to Engine Oil Pressure (EOP) Sensor

Test.231 ALL GO to Data Link Test.236 ALL GO to Engine Coolant Level (ECL) Sensor

Test.241 ALL GO to Injection Pressure Regulator (IPR) Test.246 ALL GO to Engine Fan Control (EFAN) Test.251 ALL GO to Glow Plug Control (GPC) Circuit Test.256 ALL See Note 11.261 ALL GO to Variable Geometry Turbocharger (VGT)

Actuator Test.264 ALL GO to Exhaust Gas Recirculation (EGR)

Actuator Test.267 ALL GO to Engine Crank Inhibit (ECI) System Test.311* ALL GO to Engine Oil Temperature (EOT) Sensor

Test.312* ALL GO to Engine Oil Temperature (EOT) Sensor

Test.313 ALL Refer to Section 3 Symptom Charts.314 ALL Refer to Section 3 Symptom Charts.315* ALL Refer to Section 3 Symptom Charts.316 ALL See Note 9.321 ALL Refer to Section 3 Symptom Charts.322 ALL Refer to Section 3 Symptom Charts.323 ALL See note 10.324 ALL See Note 3.325 ALL Refer to Section 3 Symptom Charts.331* ALL GO to Injection Control Pressure (ICP) System

Test.332* ALL GO to Injection Control Pressure (ICP) Sensor

Test.333* ALL GO to Injection Control Pressure (ICP) System

Test.(Continued)

2004 F650/F750 6.0L Diesel




334 ALL GO to Injection Control Pressure (ICP) SystemTest.

335 ALL GO to Injection Control Pressure (ICP) SystemTest.

341* ALL GO to Exhaust Back Pressure (EBP) SensorTest.

342* ALL GO to Exhaust Back Pressure (EBP) SensorTest.

343* ALL GO to Air Management System Test.344* ALL GO to Exhaust Back Pressure (EBP) Sensor

Test.345 ALL GO to Air Management System Test.346 ALL GO to Air Management System Test.351 ALL GO to Air Management System Test.353 ALL GO to Air Management System Test.354 ALL GO to Air Management System Test.355 ALL GO to Air Management System Test.361 ALL GO to Air Management System Test.365* ALL GO to Air Management System Test.366* ALL GO to Air Management System Test.367* ALL GO to Air Management System Test.

421-428 ALL GO to Injector Drive Circuits Test.431-438 ALL GO to Injector Drive Circuits Test.451-458 ALL GO to Injector Drive Circuits Test.

523 ALL GO to Injection Driver Module Power (IDMPWR) Test.

525* ALL GO to Injection Driver Module Power (IDMPWR) Test.



543* ALL GO to Powertrain Control Module(PCM)/Injector Driver Module (IDM)Communications Test.

551 ALL GO to Powertrain Control Module(PCM)/Injector Driver Module (IDM)Communications Test.




571-578* ALL See Note 4.(Continued)

2004 F650/F750 6.0L Diesel




613* ALL See Note 5.614* ALL See Note 6.621* ALL See Note 7.622* ALL See Note 7.623* ALL See Note 6.624 ALL See Note 7.626 ALL GO to Powertrain Control Module Power (PCM

PWR) Test.631 ALL See Note 8.632 ALL See Note 8.655 ALL See Note 7.661 ALL See Note 8.664 ALL See Note 7.665 ALL See Note 8.

(1) Note 1: * Indicates amber ENGINE indicator on when a Diagnostic Trouble Code (DTC) is set.

(2) Note 2: ** Indicates red ENGINE indicator on if the Engine Warning Protection System (EWPS)is enabled and a DTC is set.

(3) Note 3: DTC 324 does not indicate any system or circuit fault. Diagnostic tests are not requiredfor this DTC.

(4) Note 4: When DTCs are set for cylinder balance, perform all Performance Diagnostics Tests.Refer to Section 4.

(5) Note 5: Install correct PCM or IDM.

(6) Note 6: Check engine family rating code (EFRC) for the current PCM strategy. Reprogram thePCM or change the EFRC as required. Refer to Section 2.

(7) Note 7: Reprogram the PCM. Refer to Section 2.

(8) Note 8: Install a new PCM.

(9) Note 9: DTC 316 only indicates the engine has not been able to reach operating temperature.It does not indicate a circuit fault. Refer to the Workshop Manual for cooling systemdiagnostics.

(10) Note 10: If coolant level is correct, GO to Engine Coolant Level (ECL) Sensor Test.

(11) Note 11: Refer to the Workshop Manual for cooling system diagnostics.

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC Description Possible Causes Diagnostic Aids

111 — No Errors PCM No errors detected No errors detectedDetected

112 — Electrical System The PCM internally • DTC 112 is set when the The PCM monitors theVoltage B+ Out Of Range monitors battery voltage. PCM detects a generator VREF voltage and willHigh When the PCM output greater than 23 adjust the signal values for

continuously receives volts at pin X3-3 for more the sensors that use VREFgreater than 23 volts a than 0.5 seconds. for operation. If a sensor orDTC will be set. • DTC 112 can be set circuit pulls VREF lower

when jump starting the than 5 volts, the PCM mayengine and additional set out of range high DTCsvoltage is introduced. for the sensors thatIncorrect external battery operate on VREF (APS,connections can cause BAP, B+, and VSS).the voltage increase.

• If the condition causingDTC 112 is intermittent,the code will changefrom active to inactivestatus. DTC 112 will notcause the amberENGINE indicator to turnon.

113 — Electrical System The PCM internally • DTC 113 can be set by a DTC 113 is set when theVoltage B+ Out Of Range monitors battery voltage. defective generator or PCM detects less than 7.0Low When the PCM PCM power relay, volts at pin X3-3 for more

continuously receives less discharged batteries, or than 0.5 seconds.than 7.0 volts, a DTC will increased resistance inbe set. the battery feed circuits.

• If the condition causingDTC 113 is intermittent,the code will changefrom active to inactivestatus. DTC 113 will notcause the amberENGINE indicator to turnon.

(Continued)

2004 F650/F750 6.0L Diesel



114 — Engine Coolant The PCM continuously • DTC 114 is set by the Signal voltage was lessTemperature Signal Out monitors the signal of the PCM when the ECT than 0.127 volts for moreOf Range Low ECT sensor to determine if signal is less than 0.127 than 0.35 seconds.

the signal is within an volts for more than 0.35expected range. If the PCM seconds.detects an out of range • DTC 114 can set due tohigh or low, the PCM will a short to ground in theignore the ECT signal and signal circuit or aassume an engine coolant defective sensor.temperature of -34°C • When DTC 114 is set the(-29°F) for starting and amber ENGINE indicator82°C (180°F) for engine is illuminated.running conditions. Whenthis occurs, the EWPS,CAP, IST, cold idleadvance, and coolantcompensation features aredisabled.

115 — Engine Coolant The PCM continuously • DTC 115 is set by the Signal voltage was greaterTemperature Signal Out monitors the signal of the PCM when the ECT than 4.6 volts for moreOf Range High ECT sensor to determine if signal is greater than 4.6 than 0.35 seconds.

the signal is within an volts for more than 0.35expected range. If the PCM seconds.detects an out of range • DTC 115 can set due tohigh or low, the PCM will an open signal or groundignore the ECT signal and circuit, a short to aassume an engine coolant voltage source, or atemperature of -34°C defective sensor.(-29°F) for starting and • When DTC 115 is set the82°C (180°F) for engine amber ENGINE indicatorrunning conditions. When is illuminated.this occurs, the EWPS,CAP, IST, cold idleadvance, and coolantcompensation features aredisabled

121 — Intake Manifold The PCM will ignore the • DTC 121 can be set due DTC 121 is set by theAbsolute Pressure Signal MAP signal when the to a sensor signal wire PCM when the MAP signalOut Of Range High signal is detected to be out short to VREF or B+ or a is greater than 4.9 volts for

of range or an incorrect defective MAP sensor more than 0.4 seconds.value is read. The engine • When DTC 121 is activewill continue to operate the amber ENGINEbased on estimated values. indicator is illuminated.

122 — Intake Manifold The PCM will ignore the • DTC 122 can be set due DTC 122 is set by theAbsolute Pressure Signal MAP signal when the to a sensor signal circuit PCM when the MAP signalOut Of Range Low signal is detected to be out open or shorted to is less than 0.039 volts for

of range or an incorrect ground or a defective more than 0.4 seconds.value is read. The engine MAP sensor. DTC 122will continue to operate can also be set due to anbased on estimated values. extremely restricted

CAC/intake system.• When DTC 122 is active

the amber ENGINEindicator is illuminated.

(Continued)

2004 F650/F750 6.0L Diesel



123 — Intake Manifold The PCM will ignore the • DTC 123 can be set due DTC 123 is set by PCMAbsolute Pressure Signal MAP signal when the to a restricted or plugged when the MAP signal isIn-Range Fault signal is detected to be out sensor inlet, VREF greater than 120 kPa (2

of range or an incorrect shorted to a voltage psi) absolute at low idle.value is read. The engine source greater than 5.5will continue to operate volts, or a defective MAPbased on estimated values. sensor.

• When DTC 123 is activethe amber ENGINEindicator is illuminated.

124 — Injection Control The PCM continuously • DTC 124 can be set due DTC 124 is set by thePressure Signal Out Of monitors the signal of the to an open or short to PCM if signal voltage isRange Low ICP sensor to determine if ground on the signal less than 0.039 volts for

the signal is within an circuit, a defective sensor more than 0.1 seconds.expected range. If the PCM or an open VREF circuitdetects a higher or lower or a VREF circuit short tovoltage than expected, the ground. PCM will set a DTC, • When DTC 124 is activeilluminate the amber the amber ENGINEENGINE indicator, ignore indicator is illuminated.the ICP sensor signal, anduse a preset value basedon engine operatingconditions.

125 — Injection Control The PCM continuously • DTC 125 can be set due DTC 125 is set by thePressure Signal Out Of monitors the signal of the to an open signal ground PCM if the signal voltage isRange High ICP sensor to determine if circuit, short to a voltage greater than 4.9 volts for

the signal is within an source on the ICP signal more than 0.1 seconds.expected range. If the PCM circuit, or a defectivedetects a higher or lower sensor.voltage than expected, the • When DTC 125 is activePCM will set a DTC, the amber ENGINEilluminate the amber indicator is illuminated.ENGINE indicator, ignorethe ICP sensor signal, anduse a preset value basedon engine operatingconditions.

(Continued)

2004 F650/F750 6.0L Diesel



131 — APS Signal Out Of The PCM continuously • Possible causes include DTC 131 is set if the PCMRange Low monitors the APS/IVS a short to ground or an detects voltage less than

circuits for expected open in the APS signal 0.147 volts.voltages. It also compares circuit.the APS and IVS signals • DTC 131 can be set duefor conflict. If the PCM to a short to ground ordetects an APS signal out an open VREF or signalof range low, the engine circuits. If the conditionwill ignore the APS signal causing DTC 131 isand operate at low idle. intermittent and the

condition is no longerpresent, the code willbecome inactive andnormal engine operationwill resume.


132 — APS Signal Out Of The PCM continuously • DTC 132 can be set due DTC 132 is set if the PCMRange High monitors the APS/IVS to a short to VREF or B+ detects a voltage greater

circuits for expected in the APS signal circuit. than 4.55 volts. The PCMvoltages. It also compares • When DTC 132 is active monitors voltage on VREFthe APS and IVS signals the amber ENGINE A and will adjust signalfor conflict. If the PCM indicator is illuminated. values for the sensors thatdetects an APS signal out use VREF A for operation.of range high, the engine If a sensor or circuit pullswill ignore the APS signal VREF less than 5 volts, theand operate at low idle. PCM may set out of range

high DTCs for the sensorsthat operate on VREF B(APS, BAP, B+, and VSS).

133 — APS Signal In The PCM checks the • If the IVS signal is DTC 133 is caused byRange DTC voltage output of the APS changing and the APS intermittent conditions. The

by comparing the APS signal is constant, the DTC will remain active untilsignal with the IVS signal. PCM assumes the APS the vehicle has beenAPS and IVS signals can is the conflict source and shutdown and restarted.disagree in two cases: sets DTC 133. The The DTC does not recover• The APS signal indicates engine rpm is restricted without cycling the key

the pedal is pressed to idle. switch.down to accelerate, but • When DTC 133 is activethe IVS signal indicates the amber ENGINEidle position. indicator is illuminated.

• The APS signal indicatesthe pedal has beenreleased to allow theengine to return to idle,but the IVS signalindicates off-idle positionof the pedal.

If the PCM detects eitherof the above conditions,the PCM attempts toisolate the source ofconflict and set theappropriate DTC.

(Continued)

2004 F650/F750 6.0L Diesel



134 — APS Signal And The PCM checks the • If neither the APS or IVS DTC 134 is caused byIVS Disagree voltage output of the APS is changing, or both are intermittent conditions. The

by comparing the APS changing, or the PCM DTC will remain active untilsignal with the IVS signal. cannot determine the the vehicle has beenAPS and IVS signals can DTC in specified time, shutdown and restarted.disagree in two cases: DTC 134 is set and The DTC does not recover• The APS signal indicates engine rpm is restricted without cycling the key

the pedal is pressed to idle. switch.down to accelerate, but • When DTC 134 is activethe IVS signal indicates the amber ENGINEidle position. indicator is illuminated.

• The APS signal indicatesthe pedal has beenreleased to allow theengine to return to idle,but the IVS signalindicates off-idle positionof the pedal.


135 — Idle Validation The PCM checks the • If the APS is changing DTC 135 is caused bySwitch Circuit Fault voltage output of the APS but IVS is constant, the intermittent conditions. The

by comparing the APS PCM assumes the IVS is DTC will remain active untilsignal with the IVS signal. the conflict source and the vehicle has beenAPS and IVS signals can sets DTC 135. In this shutdown and restarted.disagree in two cases: case the PCM limits the The DTC does not recover• The APS signal indicates APS signal to a lower without cycling the key

the pedal is pressed value that provides less switch.down to accelerate, but than full rpm, but doesthe IVS signal indicates not limit engine rpm toidle position idle.

• The APS signal indicates • When DTC 135 is activethe pedal has been the amber ENGINEreleased to allow the indicator is illuminated.engine to return to idle,but the IVS signalindicates off-idle positionof the pedal.


(Continued)

2004 F650/F750 6.0L Diesel



141 — Vehicle Speed The PCM performs • DTC 141 is set by the The PCM will not set DTCsSensor Signal Out Of diagnostic checks on the PCM when an out of for VSS circuit failure forRange Low VSS circuit when the range low condition is vehicles equipped with

engine is operating at 0 detected in the VSS Allison MD (WTEC) andmph. The PCM transmits a circuit. 2000 series transmissions.voltage signal on the VSS • When DTC 141 is active For vehicles equipped withcircuit and determines if the amber ENGINE MD transmissions,the return voltage is out of indicator is not diagnose therange high or low. When a illuminated. communication circuitfault condition is detected, (CAN 1) between thethe PCM disables the engine and transmissioncruise control and power module.takeoff. If the road speedlimiting option is enabled,the PCM will limit enginerpm for all gears.

142 — Vehicle Speed The PCM performs • DTC 142 is set by the The PCM monitors voltageSensor Signal Out Of diagnostic checks on the PCM when an out of on VREF A and will adjustRange High VSS circuit when the range high condition is signal values for the

engine is operating at 0 detected in the VSS sensors that use VREF Amph. The PCM transmits a circuit. for operation. If a sensor orvoltage signal on the VSS • When DTC 142 is active circuit pulls VREF less thancircuit and determines if the amber ENGINE 5 volts, the PCM may setthe return voltage is out of indicator is not out of range high DTCs forrange high or low. When a illuminated. the sensors that operate onfault condition is detected, VREF B (APS, BAP, B+,the PCM disables the and VSS).cruise control and powertakeoff. If the road speedlimiting option is enabled,the PCM will limit enginerpm for all gears.

143 — Incorrect CMP An inactive CMP signal • DTC 143 is set by the An inactive CMP signal willSignal Signature during cranking is PCM when the CMP cause a no start condition.

detectable by the PCM. transition occurs at theDuring engine cranking the wrong CKP location.PCM monitors the CKP • DTC 143 can be set duesignal and Injection Control to a mistimed CMP toPressure (ICP) to verify the CKP signal, electricalengine is rotating. If the noise in the CMP circuit,CMP signal is inactive or a defective CMPduring this time a DTC will sensor.be set. Electrical noise canalso be detected by thePCM. When the level issufficient to affect engineoperation, a correspondingDTC will be set.

(Continued)

2004 F650/F750 6.0L Diesel



145 — CMP Signal An inactive CMP signal • DTC 145 is set by the An inactive CMP signal willInactive during cranking is PCM when the CMP cause a no start condition.

detectable by the PCM. signal is inactive, theDuring engine cranking the CKP signal is active, andPCM monitors the CKP the ICP has increased.signal and Injection Control • DTC 145 can be set duePressure (ICP) to verify the to an open short toengine is rotating. If the ground or open voltageCMP signal is inactive source in the CMPduring this time a DTC will circuit. A defective sensorbe set. Electrical noise can can cause DTC 145 toalso be detected by the be set.PCM. When the level issufficient to affect engineoperation, a correspondingDTC will be set.

146 — CKP Signal An inactive CKP signal • DTC 146 is set by the An inactive CKP signal willInactive during cranking is PCM when no CKP cause a no start condition.

detectable by the PCM. signal is detected whileDuring engine cranking the the CMP signal is activePCM monitors the CMP and ICP has increased.signal and injection control • DTC 146 can be set duepressure to verify the to an open short toengine is rotating. If the ground or voltage sourceCKP signal is inactive in the CKP circuit. Aduring this time a DTC will defective CKP sensorbe set. Electrical noise can can also set DTC 146.also be detected by thePCM, if the level issufficient to effect engineoperation, a correspondingDTC will be set.

147 — Incorrect CKP An inactive CKP signal • DTC 147 is set by the An inactive CKP signal willSignal Signature during cranking is PCM when the CKP cause a no start condition.

detectable by the PCM. signal has too few orDuring engine cranking the many transitions perPCM monitors the CMP engine rotation.signal and injection control • DTC 147 can be set duepressure to verify the to an electrical noise inengine is rotating. If the the CKP circuit or aCKP signal is inactive defective CKP sensor.during this time a DTC willbe set. Electrical noise canalso be detected by thePCM. If the level issufficient to affect engineoperation, a correspondingDTC will be set.

(Continued)

2004 F650/F750 6.0L Diesel



151 — Barometric When the PCM detects the • DTC 151 is set when the The PCM monitors voltageAbsolute Pressure Signal BAP voltage signal out of BAP signal is greater on VREF A and will adjustOut Of Range High range high, the PCM will than 4.95 volts for more signal values for the

ignore the BAP signal and than 0.5 seconds. sensors that use VREF Ause the Manifold Absolute • DTC 151 can be set for operation. If a sensor orPressure (MAP) signal when the signal circuit is circuit pulls VREF less thangenerated at low idle as an shorted to VREF or B+. 5 volts, the PCM may setindication of barometric A defective BAP sensor out of range high DTCs forpressure. When a MAP can also set DTC 151. the sensors that operate onfault is detected, the BAP • When DTC 151 is set the VREF B (APS, BAP, B+,signal will default to amber ENGINE indicator and VSS).barometric pressure at sea is illuminated.level, 100.24 kPa (29.6 inHg).

152 — Barometric When the PCM detects the • DTC 152 can be set DTC 152 is set when theAbsolute Pressure Signal BAP voltage signal out of when the signal circuit is BAP signal is less than 1.0Out Of Range Low range low, the PCM will shorted to ground or volts for more than 0.5

ignore the BAP signal and open. If VREF is shorted seconds.use the Manifold Absolute to ground, DTC 152 canPressure (MAP) signal be set. A defective BAPgenerated at low idle as an sensor can set DTC 152.indication of barometric • When DTC 152 is set thepressure. When a MAP amber ENGINE indicatorfault is detected, the BAP is illuminated.signal will default tobarometric pressure at sealevel, 100.24 kPa (29.6 inHg).

154 — Inlet Air When the PCM detects an • DTC 154 can be set due DTC 154 is set by theTemperature Signal Out IAT signal out of range to a short to ground in PCM if signal voltage isOf Range Low low, the PCM will ignore the signal circuit or a less than 0.127 volts for

the IAT signal and assume defective IAT sensor. more than 0.35 seconds.an ambient temperature of • When DTC 154 is set, When DTC 154 is set, the25°C (77°F). the amber ENGINE PCM will default to 25°C

indicator is illuminated. (77°F) for starting

155 — Inlet Air When the PCM detects an • DTC 155 can set due to DTC 155 is set by thetemperature Signal Out IAT signal out of range an open signal or ground PCM if signal voltage isOf Range High high, the PCM will ignore circuit, a short to a greater than 4.6 volts for

the IAT signal and assume voltage source, or a more than 0.35 seconds.an ambient temperature of defective sensor. When DTC 155 is set, the25°C (77°F). • When DTC 155 is active, PCM will default to a value

the amber ENGINE of 25°C (77°F) for starting.indicator is illuminated.

161 — Manifold Air The PCM continuously • DTC 161 can be set due DTC 161 is set by theTemperature Signal Out monitors the signal of the to a short to ground in PCM when the signalOf Range Low MAT sensor to determine if the signal circuit or a voltage is less than 0.098

the signal is within an defective sensor. volts for more than 0.35expected range. If the PCM • When DTC 161 is active seconds.detects the signal voltage the amber ENGINEis higher or lower than indicator is illuminated.expected, the PCM will seta DTC.

(Continued)

2004 F650/F750 6.0L Diesel



162 — Manifold Air The PCM continuously • DTC 162 can be set due DTC 162 is set by PCMTemperature Signal Out monitors the signal of the to an open signal or when the signal voltage isOf Range High MAT sensor to determine if ground circuit , short to a greater than 4.58 volts for

the signal is within an voltage source, or a more than 0.35 seconds.expected range. If the PCM defective sensor.detects the signal voltage • When DTC 162 is activeis higher or lower than the amber ENGINEexpected, the PCM will set indicator is illuminated.a DTC.

163 — Exhaust Gas The EGRP sensor is • DTC 163 is set by the The EGR actuator can beRecirculation Valve calibrated to zero position PCM when the EGRP tested for a stuck orPosition Signal Out Of each time the key is cycled voltage is greater than sticking valve byRange Low to allow compensation if 0.3 volts for more than performing an Output State

carbon deposits develop on 0.35 seconds. Low Test while monitoringthe valve. If the deposits • DTC 163 can be set due EGRP percentage. Refer toget so heavy that the to an open or short to Section 4 Performanceposition is out of range to ground on the signal Diagnostics.zero, a DTC will be set, the circuit, a defective sensorvalve will close. When the or an open VREF circuitEGRP signal voltage is or a VREF circuit short todetected out of range high ground. or low, the PCM will cause • When DTC 163 is activethe engine to ignore the the amber ENGINEEGRP signal and the EGR indicator is illuminated.valve will close.

164 — Exhaust Gas The EGRP sensor is • DTC 164 is set by the The EGR actuator canRecirculation Valve calibrated to zero position PCM when the EGRP tested for a stuck orPosition Signal Out Of each time the key is cycled voltage is greater than sticking valve byRange High to allow compensation if 4.5 volts for more than performing an Output State

carbon deposits develop on 0.35 seconds. Low Test while monitoringthe valve. If the deposits • DTC 164 can be set due EGRP percentage. Refer toget so heavy that the to an open or short to Section 4 Performanceposition is out of range to ground on the signal Diagnostics.zero, a DTC will be set, the circuit, a defective sensorvalve will close. When the or an open VREF circuitEGRP signal voltage is or VREF short to ground.detected out of range high • When DTC 164 is activeor low, the PCM will cause the amber ENGINEthe engine to ignore the indicator is illuminated.EGRP signal and the EGRvalve will close.

211 — Engine Oil When the EOP signal • DTC 211 can be set due DTC 211 is set by thePressure Signal Out Of voltage is detected out of to an open or short to PCM when the EOP signalRange Low range low, the PCM will ground on the signal is less than 0.039 volts for

cause the engine to ignore circuit, a defective sensor more than 0.35 seconds.the EOP signal and disable or an open VREF circuitthe Engine Warning and or VREF short to ground.Protection System (EWPS). • When DTC 211 is active


(Continued)

2004 F650/F750 6.0L Diesel



212 — Engine Oil When the EOP signal • DTC 212 can be set due DTC 212 is set by thePressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EOP signalRange High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts for

cause the engine to ignore source on the ICP signal more than 0.35 seconds.the EOP signal and disable circuit, or a defectivethe Engine Warning and sensor.Protection System (EWPS). • When DTC 212 is set the

amber ENGINE indicatoris illuminated.

215 — Vehicle Speed The PCM performs • DTC 215 is set by the The PCM will not set DTCsSensor Signal Frequency diagnostic checks on the PCM when the PCM for VSS circuit failure forOut Of Range High VSS circuit when the detects a VSS signal vehicles equipped with

engine is operating at 0 greater than 4365 Hz. Allison MD (WTEC) andmph. The PCM transmits a 2000 series transmissions.voltage signal on the VSS Vehicles equipped with MDcircuit and determines if transmissions onlythe return voltage is out of diagnose therange high or low. When a communication circuitfault condition is detected, (CAN 1) between thethe PCM disables the engine and transmissioncruise control and power module.takeoff. If the road speedlimiting option is enabled,the PCM will limit enginerpm for all gears.

225 — EOP Sensor When the EOP signal • DTC 225 is set by the KOEO Engine oil pressureSignal In Range Fault voltage is detected out of PCM when the EOP is greater than 15 psi.

range high, the PCM will signal voltage is highercause the engine to ignore than expected with thethe EOP signal and disable key ON and the enginethe Engine Warning and OFF.Protection System (EWPS). • DTC 225 can be set due

to a biased circuit or adefective EOP sensor.


(Continued)

2004 F650/F750 6.0L Diesel



231 Data Communication The PCM continuously • DTC 231 is set when the Vehicles equipped with theLink Error monitors the datalink for an PCM cannot access the Allison WTEC transmission

open, short or intermittent datalink. When this may display DTC 231connection. If an active occurs, data cannot be when attempting toDTC occurs on the retrieved using the scan program the PCM. Thedatalink, the diagnostic tool. DTCs can only be WTEC controller must besoftware will not display retrieved using the cruise disconnected whencorrect data. control feature. programming the engine

• DTC 231 can be set PCM.when the any of thefollowing conditionsoccur:• Defective device

(transmission controlleror anti-lock brakecontroller) is connectedto the bus and pullssignal to ground.

• Number of devicesexceeds limit

• Defective PCM• When DTC 231 is active

the amber ENGINEindicator is notilluminated.

236 ECL Switch Circuit The PCM continuously • DTC 236 can be set Signal voltage was greaterFault monitors the ECL circuit for when a high resistance than 3.4 volts or less than

in-range faults. The PCM connection or intermittent 4.3 volts more than 2.0does not detect open or short to ground in the seconds.short circuits in the ECL circuit exists.system. When the PCM • DTC 236 will not causedetects an in-range fault, the red ENGINE indicatorDTC 236 will be set. to illuminate. If the

condition is intermittent,the DTC will be loggedas inactive.

(Continued)

2004 F650/F750 6.0L Diesel



241 — Injection Control An open or short to ground • DTC 241 is set by the Output Circuit CheckPressure Regulator in the EGR control circuit PCM when the OCC test detected indicates high orOutput Circuit Check can be detected by an on has failed after the low resistance in circuit.(OCC) Self-test Failed demand output circuit KOEO Standard test has

check during KOEO been run.Standard tests. If there is a • DTC 241 can be setcircuit fault detected a DTC when a poor connectionwill be set. When the to the IPR solenoid orengine is running, the PCM defective IPR coil exists.can detect if the injection • When DTC 241 is set thecontrol pressure is equal to engine will not run andthe desired pressure. the amber ENGINEWhen the measured indicator will not beinjection control pressure illuminated.does not compare to thedesired pressure, the PCMwill ignore the measuredICP signal and control theengine with the desiredvalue.

246 — Engine Fan Output An open or short to ground • DTC 246 is set by the Before diagnosing, verifyCircuit Check (OCC) in the EFAN can be PCM only during the the PCM is programmedSelf-test Failed detected by the PCM KOEO Standard test. correctly. Verify the vehicle

during an on-demand During this test the PCM has an electronic fan.engine standard test. The performs an output circuitIAT and ECT are test that momentarilymonitored continuously. If a enables the EFANDTC is detected in the IAT solenoid and measuresor ECT, the EFAN control the voltage drop acrossis disabled and the engine the relayfan is on all the time.

251 — Glow Plug Control An open or short to ground • DTC 251 can be set for Glow plug and glow plugOutput Circuit Check in the glow plug relay an open or shorted GPC harness problems cannot(OCC) Self-test Failed circuit can be detected by signal circuit, an open be detected by the PCM.

an on demand output feed circuit, or an opencircuit check performed glow plug relay coil.during the KOEO Standardtests. When a circuit faultis detected, a DTC will beset.

256 — Radiator Shutter A fault in the Radiator • DTC 256 can be set RSE output circuit checkEnable Output Circuit Shutter Enable (RSE) when an open, short to a self-test failed.Check (OCC) Self-test circuit can be detected by voltage source or short toFailed an on demand output ground in the RSE circuit

circuit check during KOEO exists.Standard test. • DTC 256 can be set due

to a defective relay.(Continued)

2004 F650/F750 6.0L Diesel



261 — Variable Geometry An open or short to ground • DTC 261 can be set DTC 261 can be set whenTurbo Output Circuit in the VGT control circuit when an open or short to a poor connection to theCheck (OCC) Self-test can be detected by an on ground in the VGT VGT solenoid exists.Failed demand output circuit control circuit or a

check during KOEO defective VGT coil exists.Standard tests. If there is acircuit fault detected a DTCwill be set. When theengine is running, the PCMcan detect if the exhaustback pressure is equal tothe desired pressure.When the measuredexhaust back pressuredoes not compare to thedesired pressure, the PCMwill ignore the measuredEBP signal and will controlthe engine with the desiredvalue.

264 — Exhaust Gas An open or short to ground • DTC 264 can be set due EGR output circuit checkRecirculation Output in the EGR control circuit to open or short to self-test failed.Circuit Check (OCC) can be detected by an on ground, short to aSelf-test Failed demand output circuit voltage source in the

check during KOEO EGR control circuit, or astandard test. If there is a defective coil.circuit fault detected a DTCwill be set.

267 — Engine Crank When the on demand • DTC 267 can be set due If the engine cranks whenInhibit Output Circuit engine on standard test is an open or short to the start switch is engaged,Check (OCC) Self-test performed, an open or ground on the coil side of check for failed ECI relayFailed short to ground can be the ECI relay. or problems with the PCM

detected on the coil side of or PCM wiring harness.the ECI relay.

311 — Engine Oil The EOT sensor provides • DTC 311 can be set due DTC 311 is set by theTemperature Signal Out a feedback signal to the to a sensor signal wire PCM when the EOT signalOf Range Low PCM indicating engine oil short to ground or a is less than 0.2 volts for

temperature. The PCM defective EOT sensor. more than 0.35 seconds.monitors the EOT signal to • When DTC 311 is activecontrol fuel quantity and the amber ENGINEtiming throughout the indicator is illuminated.operating range of theengine. During engineoperation, if the PCMrecognizes that the EOTsignal is lower or higherthan the expected value itwill set a DTC.

(Continued)

2004 F650/F750 6.0L Diesel



312 — Engine Oil The EOT sensor provides • DTC 312 can be set due DTC 312 is set by theTemperature Signal Out a feedback signal to the to a signal or ground PCM when the EOT signalOf Range High PCM indicating engine oil circuit open, a short to a is greater than 4.8 volts for

temperature. The PCM voltage source, or a more than 0.35 seconds.monitors the EOT signal to defective EOT sensor.control fuel quantity and • When DTC 312 is activetiming throughout the the amber ENGINEoperating range of the indicator is illuminated.engine. During engineoperation, if the PCMrecognizes that the EOTsignal is lower or higherthan the expected value itwill set a DTC.

313 — Engine Oil • DTC 313 is set by the • DTC 313 can be set due Compare the actual oilPressure Below Warning PCM when the oil to a defective sensor pressure to the reading onLevel pressure has dropped sending an incorrect the data list of the scan

below the warning level. signal. Low oil pressure tool.The specifications for the due to defectivewarning level are : mechanical components• 34 kPa (5.0 psi) @ 700 will also set DTC 313.

rpm • The PCM illuminates the• 69 kPa (10.0 psi) @ red ENGINE indicator

1400 rpm and sounds an audible• 138 kPa (20.0 psi) @ alarm.

2000 rpm

314 — Engine Oil • DTC 314 is set by the • DTC 314 can be set due Compare the actual oilPressure Below Critical PCM when the oil to a defective sensor pressure to the reading onLevel pressure has dropped sending an incorrect the data list of the scan

below the critical level. signal. Low oil pressure tool.The specification for the due to defectivecritical level is: mechanical components• 14 kPa (2.0 psi) @ 700 will also set DTC 314.

rpm • The PCM illuminates the• 34 kPa (5.0 psi) @ red ENGINE indicator

1400 rpm and sounds an audible• 152 kPa (12.0 psi) @ alarm.

2000 rpm

315 — Engine Speed DTC 315 is set by the • DTC 315 can be set due The engine hours andAbove Warning level PCM when the engine rpm to any of the following miles of the last two over

has exceeded 3350 rpm. conditions: speed occurrences will be• Excessive engine recorded in the Engine

speed in an unintended Event Log.downshift.

• Steep accelerationdownhill without correctbrake application.

• External fuel sourcebeing ingested into airintake system.


(Continued)

2004 F650/F750 6.0L Diesel



316 — Engine Coolant • DTC 316 is set if the • DTC 316 can be set due DTC 316 only indicates theTemperature Unable To engine does not reach to any of the following engine has not been ableReach Commanded Set operating temperature. conditions: to reach operatingPoint DTC 316 will only be set • Extended idle time. temperature. It does not

with engines that have • Cold ambient indicate an electronic fault.cold ambient protection temperatures (may(CAP) strategy enabled. require use of winterDTC 316 is set after the front).engine has run for more • Thermostat stuck inthan 120 minutes and open position.has not exceeded the • Incorrectly plumbedfollowing specifications cooling systemfor engine coolant (thermostat bypassed).temperature: • Fan clutch locked on.• Manual transmission

65° C (149° F)• Automatic transmission

60° C (140° F)

321 — Engine Coolant DTC 321 is set by the • The PCM illuminates the The PCM will log theTemperature Above PCM when the engine red ENGINE indicator engine hours and odometerWarning Level coolant temperature is and sounds the audible reading at the time of

above 109°C (228°F). alarm. occurrence.• When the temperature

drops below 109°C(228°F) the DTC willbecome inactive.

322 — Engine Coolant DTC 322 is set by the • The PCM illuminates the The PCM will log theTemperature Above PCM when the engine red ENGINE indicator engine hours and odometerCritical Level coolant temperature is and sounds the audible reading at the time of

above 112.5°C (234.5°F). alarm. occurrence.• When the temperature

drops below 112.5°C(234.5°F) the DTC willbecome inactive.

323 — Engine Coolant DTC 323 is set by the • When the coolant has If coolant level is correct,Level Below PCM when coolant is low. returned to correct levels, an ECL signal shorted toWarning/Critical Level When the EWPS mode is DTC 323 will become ground can cause DTC

3-way protection and DTC inactive. The PCM will 323.323 is active, the engine log the engine hours andwill shutdown. odometer reading at the

time of occurrence. Afterthe shutdown, the enginecan be restarted for thirtyseconds.

(Continued)

2004 F650/F750 6.0L Diesel



324 — Idle Shutdown The IST feature is internal • DTC 324 is set by the DTC 324 does not indicateTimer Enabled Engine to the PCM. The PCM when the engine any system or circuitShutdown subsystems that contribute has been shutdown due DTCs. Diagnostic checks

to the IST strategy have to exceeding the are not required for DTCtheir own fault codes. The programmed idle time 324.fault code for the IST is not criteria. The IST featurea system diagnostic trouble must be enabled for DTCcode. The IST fault code is 324 to be displayed.only set to indicate that theIST has been activated andthe engine has shutdown.

DTC 325 — Power DTC 325 is set by the • When the temperature For each Celsius degree ofReduced - Matched To PCM when the cooling drops below 107°C temperature the fuel will beCooling System system temperature (225°C ) the DTC will reduced 6%. This reducesPerformance exceeds 107°C (225°C). At become inactive and the the heat produced by the

this temperature the PCM engine will return to engine and reduces thewill reduce the fuel normal operation. burden on the coolingdelivered to the engine. system. The vehicle speed

will also be reduced andallow the operator todownshift and increase theefficiency of the coolingsystem. As the temperatureis reduced thecompensation level isreduced until thetemperature drops below107°C (225°F ) and normaloperation is resumed.

DTC 331 - Injection DTC 331 is set by the DTC 331 can be an Check oil level forControl Pressure Above PCM when the injection indicator of a problem in contamination, debris, andSystem Working Range control pressure is above the mechanical injection correct API classification.

normal working range of 25 control pressure system,MPa (3675 psi). When wiring, or ICP sensor.DTC 331 is active, the Possible causes for DTCPCM will ignore feedback 331 include the following:from the ICP sensor and • Debris in enginecontrol the IPR valve from • Incorrect grade of oilprogrammed default • Defective, stuck orvalues. plugged inlet on the IPR

valve• IPR control wire shorted

to ground• ICP sensor or circuit

causing signal to bebiased high

The amber ENGINEindicator will be illuminatedwhen DTC 331 is active.

(Continued)

2004 F650/F750 6.0L Diesel



332 — Injection Control DTC 332 is set by the • DTC 332 can be caused If the PCM sets DTC 332,Pressure Above PCM, if the voltage signal by a defective sensor, a the PCM will ignore theSpecification With Engine from the ICP sensor is biased circuit, or ICP signal and operate theNot Running higher than expected with momentary loss of the IPR with fixed values

the key on engine off. CMP/CKP signal. based on engine operating• When DTC 332 is active conditions.


333 — Injection Control DTC 333 is set by the • Low oil level in If ICP system wasPressure Above/below PCM when the measured crankcase. serviced, vehicle should beDesired Level pressure does not match • Contaminated engine oil. operated 20 miles to

the pressure expected by • Debris in engine oil. validate systemthe PCM. DTC 333 will be • Aerated engine oil. performance.set if the measured value • Trapped air in the ICPis less than or greater than system (particularly after2.5 MPa (362 psi) of an injector or highdesired injection control pressure pumppressure for a period replacement).greater than 7 seconds. • Intermittent IPR valveWhen DTC 333 is active, wiring connection.the PCM will ignore Spread IPR harnessfeedback from the ICP terminals at valve, poorlysensor and control the IPR crimped terminals, orvalve from programmed pulled back pins.default values. • Defective or stuck

injection pressureregulator.

• Leaks in ICP system.• Problem with ICP sensor

or sensor circuit,incorrect sensor, systembiased high or low.

• Defective high pressurehydraulic pump.

• The amber ENGINEindicator will beilluminated when DTC333 is active.

(Continued)

2004 F650/F750 6.0L Diesel



334 — ICP Unable To DTC 334 indicates an • Low oil level in DTC 344 can be set due toReach Set Point (Poor injection control system crankcase. a plugged EBP sensor or aPerformance) response time fault and • Contaminated engine oil. restriction in the tube

may be set during normal • Debris in engine oil. leading to the sensor. Toengine operation through • Aerated engine oil. check for this condition,the continuous monitor • Trapped air in the ICP remove the sensor andfunction or during the system (particularly after tube and inspect for carbonEngine Running Standard an injector or high deposits.Test. DTC 334 compares pressure pumpmeasured ICP to desired replacement)ICP and looks for a large • Intermittent IPR valvepressure difference of 9 wiring connection.MPa (1300 psi) for a period Spread IPR harnessof 3 seconds. When DTC terminals at valve, poorly334 is active, the PCM crimped terminals, orignores the ICP sensor and pulled-back pins.controls the IPR valve • Defective or stuckoperation from injection pressureprogrammed default regulator.values. • Leaks in ICP system.

• Problem with ICP sensoror sensor circuit,incorrect sensor, systembiased high or low.

• Defective high pressurehydraulic pump.

335 — ICP Unable To DTC 335 is set after the • Low oil level in Engine cranking timeBuild Pressure During PCM detects 8 to 10 crankcase varies with engineCranking seconds of engine cranking • No lube oil pressure or temperature. Verify ICP

with less than 5 MPa (725 lube oil delivery (reservoir sensor and IPR wiring ispsi) of ICP. Engine empty or not filling) connected. Check for oilcranking speed must be • Trapped air in the ICP leaks. Verify if system hasgreater than 130 rpm system (particularly after been recently serviced (airbefore diagnostic trouble an injector or high entrapment). If ICP systemcode detection can begin. pressure pump was serviced, vehicle

replacement) should be operated 20• Leaks in ICP system miles to validate system• Defective or stuck performance.

injection pressureregulator

• Loose high pressurehydraulic pump gear

• Defective high pressurehydraulic pump

341 — Exhaust Back When the EBP signal • DTC 341 can be set due DTC 341 is set by thePressure Signal Out Of voltage is detected out of to an open or short to PCM when the EBP signalRange Low range low, the PCM will ground on the signal is less than 0.039 volts for

cause the engine to ignore circuit, a defective sensor more than 0.5 seconds.the EBP signal. The EGR or an open VREF circuitvalve will close and the or VREF short to ground.PCM will rely on the VGT • When DTC 341 is activepre-programmed values. the amber ENGINE

indicator is illuminated.(Continued)

2004 F650/F750 6.0L Diesel



342 — Exhaust Back When the EBP signal • DTC 342 can be set due DTC 342 is set by thePressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EBP signalRange High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts for

cause the engine to ignore source on the EBP signal more than 0.5 seconds.the EBP signal. The EGR circuit, or a defectivevalve will close and the sensor.PCM will rely on the VGT • When DTC 342 is activepre-programmed values. the amber ENGINE

indicator is illuminated.

343 — Excessive Exhaust DTC 343 is set by the • EBP sensor bias high Make sure all sensor,Back Pressure (Gauge) PCM when the exhaust • EBP signal ground open injector and actuator

backpressure is greater • Exhaust restriction electrical DTCs have beenthan 260 kPa (37.7 psi). (muffler or catalytic repaired.

converter)• VGT valve or vanes

stuck closed• VGT Control Circuit short

to B

344 — Exhaust Back DTC 344 is set by the • EBP sensor bias high Make sure all sensor,Pressure Above PCM when the EBP is • EBP sensor or tube line injector and actuatorSpecification When greater than 300 kPa (43.5 plugged electrical DTCs have beenEngine Off psi) when engine is off or repaired.

being cranked.

345 — Faults Detected DTC 345 is set by the • Oil pressure and quality Make sure all sensor,During VGT Portion Of PCM during the AMS test • High intake restriction injector and actuatorThe AMS Test when the PCM measures • Intake/CAC system leak electrical DTCs have been

the EBP and does not see (pipes, loose clamps, repaired.the expected response in hoses)pressures. • Exhaust system leak

• MAP sensor bias• EBP sensor bias• EGR stuck open• VGT valve or vanes

sticking• EBP sensor or tube

plugged• Power cylinder integrity• VGT control circuit

346 - Faults Detected DTC 346 is set by the • EGR valve stuck or Make sure all sensor,During EGR Portion Of PCM during AMS test sticking injector and actuatorAMS Test when the PCM measures • EGR valve position electrical DTCs have been

EBP and EGRP and does sensor bias repaired.not see the expected • EBP sensor biasresponse in pressures • EBP sensor or tubeversus position. plugged

• EGR control circuit

351 - Change In Exhaust DTC 351 is set by the • EBP tube or sensor Make sure all sensor,Back Pressure Did Not PCM when less than 14.5 plugged injector and actuatorOccur When Expected kPa (2.1 psi) is detected • EBP sensor bias electrical DTCs have been

between key ON and 2500 • EGR valve stuck open repaired.rpm. • Exhaust system leak

(Continued)

2004 F650/F750 6.0L Diesel



353 - Variable Geometry DTC 353 is set when the • Oil pressure and quality Make sure all sensor,Turbo Control Over Duty PCM overcompensates by • High intake restriction injector and actuatorCycle increasing duty cycle to the • Intake/CAC system leak electrical DTCs have been

VGT to achieve desired (pipes, loose clamps, repaired.boost/backpressure hoses)

• Exhaust system leak• BAP sensor bias low• MAP sensor bias low• EBP sensor bias low• ICP sensor bias high• Power cylinder integrity• ICP system integrity• Injector operation/part

number• EGR valve stuck open• VGT valve or vanes

sticking• VGT control circuit open

354 — Variable Geometry DTC 354 is set when the • Oil pressure and quality. Make sure all sensor,Turbo Control Under PCM overcompensates by • BAP sensor bias high. injector and actuatorDuty Cycle decreasing duty cycle to • MAP sensor bias high. electrical DTCs have been

the VGT to achieve the • EBP sensor bias high. repaired.desired • Open exhaust (noboost/backpressure. muffler).

• ICP sensor bias low.• ICP system integrity.• Injector operation/part

number• Exhaust restriction

(muffler or catalyticconverter)

355 — Variable Geometry DTC 355 is set when the • High intake restriction Make sure all sensor,Turbo Overspeed PCM detects turbo over • Intake/CAC system leak injector and actuator

speed several times in a (pipes, loose clamps, electrical DTCs have beenspecific period of time hoses) repaired.(dependent on PCM • Restricted CAC systemcalibration). Turbo speed is • VGT valves or vanesestimated by engine speed, stickingboost pressure, and • Open exhaust (nobarometric pressure. muffler)

• BAP sensor bias• MAP sensor bias high• EBP sensor bias low

(Continued)

2004 F650/F750 6.0L Diesel



361 - VGT Control Input DTC 361 is set when the • High intake restriction Make sure all sensor,(MAP/EBP) Above/Below PCM detects an in range • Intake/CAC system leak injector and actuatorDesired Level error in the MAP/EBP (pipes, loose clamps, electrical DTCs have been

signal. hoses) repaired.• BAP sensor bias• MAP sensor bias• EBP sensor bias• Power cylinder integrity• ICP system integrity.• Injector operation/part

number• EGR valve stuck open• VGT valve or vanes

sticking• VGT control circuit open• Open exhaust (no

muffler)• Exhaust restriction or

leak (muffler or catalyticconverter)

DTC 365 - EGR Valve DTC 365 is set when the • EGR valve stuck or Make sure all sensor,Position Above/Below actual EGR valve position sticking injector and actuatorDesired Level does not match desired • EGR valve position electrical DTCs have been

position. sensor bias repaired.• EBP sensor or tube

plugged• EBP sensor bias• EGR control circuit

DTC 366 - EGR Valve DTC 366 is set when the • EGR valve stuck Make sure all sensor,Duty Operating Out Of PCM has • EGR valve sluggish injector and actuatorExpected Range overcompensated by • EGR valve position electrical DTCs have been

increasing or decreasing sensor error repaired.EGR duty to achieve the • Exhaust leakdesired EGRP. • BAP sensor bias

• EBP sensor bias• MAP sensor bias• EGR cooler

restriction/leak

DTC 367 - Improper DTC 367 is set when the • EGR valve stuck open Make sure all sensor,Position Signal When PCM detects the EGR • EGR valve position injector and actuatorEGR Valve Is Expected valve position is out of sensor bias high electrical DTCs have beenClosed desired range during initial repaired.

key ON (signal voltagegreater than 2.5 volts).

421 through 428 — DTC 421-428 is set by the • DTC 421-428 usually The last digit in the injectorCylinder #1 through PCM when the rising time indicates a harness or DTC corresponds to theCylinder #8 High Side To is too long on open or coil is open. cylinder where a fault hasLow Side Open close coil. been detected.

431 through 438 — DTC 431-438 is set by the • DTC 431-438 usually The last digit in the injectorCylinder #1 through PCM when the rising time indicates an internally DTC corresponds to theCylinder #8 High Side to 20 amps is short, but shorted coil cylinder where a fault hasShorted To Low Side not zero on the open or been detected.

close coil.(Continued)

2004 F650/F750 6.0L Diesel



451 through 458 — DTC 451-458 is set by the • DTC 451-458 usually The last digit in the injectorCylinder #1 through PCM when the rising time indicates the harness or DTC corresponds to theCylinder #8 High Side to 20 amps is zero on the coil is shorted to ground cylinder where a fault hasShort To Ground Or open or close coil. been detected.VPWR

523 — IDM VPWR The IDM internally monitors • DTC 523 can be set due DTC 523 is set by theVoltage Low battery voltage. When the to poor connections PCM when the voltage

IDM continuously receives between the IDM terminal from the ignition switch isless than 7 volts, a DTC X3-7 and the ignition less than 7 volts.will be set. switch.

525 — IDM Fault DTC 525 is set by the • IDM When DTC 525 is set,PCM when there is an install a new IDM.internal IDM failure.

533 — IDM Relay Voltage DTC 533 is set by the • DTC 533 can be set due DTC 533 can be set whenHigh PCM when the voltage to a generator voltage jump starting the engine

from the IDM power relay output of greater than 16exceeds 16 volts. volts or an incorrect

external batteryconnections exist.

534 — IDM Relay Voltage DTC 534 is set by the • DTC 534 can be set due IDM relay voltage is lessLowa PCM when the voltage to a defective generator, than 7 volts.

from the IDM power relay IDM power relay,is less than 7 volts. discharged batteries or

increased resistance inthe battery feed circuits

543 — PCM/IDM DTC 543 is set by the • DTC 543 can be set If IDM power is low, DTCCommunications Fault PCM when the PCM is not when the CAN 2 lines 543 can be set.

communicating with the between the PCM andIDM. IDM are shorted to

ground, VREF, battery orthe current is open.


551 — IDM/CMPO Signal DTC 551 is set by the • DTC 551 can be set DTC 551 can also be setInactive PCM when no CMPO when the CMPO is open, when no CMPO/CKPO is

signal is present while the or shorted to ground or present while the PCMCKPO is active. shorted to a voltage reports it is in the run

source. If logic power is mode.low, DTC 551 can be set.

552 — IDM Incorrect DTC 552 is set when the • DTC 552 can be set due The PCM continuouslyCMPO Signal Signature CMPO transition occurs at to a camshaft incorrectly monitors the IDM. When

the wrong CKPO tooth. timed to crankshaft or an the PCM fails to receiveelectrical noise creating a required continuousmiscount on CMP communication from thelocation. IDM, the PCM will set a

DTC(Continued)

2004 F650/F750 6.0L Diesel



DTC 553 — IDM CKPO DTC 553 is set by the • DTC 553 can be set DTC 552 can also be setSignal Inactive PCM when no CKPO when CKPO is open, when no CMPO/CKPO is

signal is present while the shorted to ground, or present while the PCMCMPO is active. shorted to a voltage reports it is in the run

source. DTC 553 can mode.also be set if logic poweris low.

554 — IDM Incorrect DTC 554 is set by the • DTC 554 can be set due The PCM continuouslyCKPO Signal Signature PCM when CKPO signal to an electrical noise or a monitors the IDM. When

has too few or too many defective CKP sensor. the PCM fails to receivetransitions per engine required continuousrotation. communication from the

IDM, the PCM will set aDTC.

571 through 578 — DTC 571 through 578 is • Oil pressure and quality When DTCs are set forCylinder #1 through set by the PCM when the • Fuel pressure Cylinder Balance allCylinder #8 Cylinder IDM is unable to adjust fuel • Intake restriction Performance DiagnosticsBalance Limit Exceeded quantity to compensate for • EGR system should be performed.

rough idle. • Exhaust systemrestriction

613 — PCM/IDM Software PCM/IDM software is • Replacement of PCM or Install correct PCM or IDM.Not Compatible incompatible IDM

614 — EFRC/PCM Engine Family Rating • Incorrect Engine Family Check EFRC and verifyConfiguration Mismatch Code (EFRC) does not Rating Code (EFRC) that it matches the PCM

match PCM strategy level. selected for the PCM strategy level. Reprogramstrategy programmed in the PCM or change thethe module. EFRC as required.

621 — Engine Using Mfg. Manufacturing defaults • Programmable Program PCM.Default Rating selected. Very low power parameters for the PCM

(25 hp). were never programmedin module. (Usuallyoccurs in new vehicle ornew module).

622 — Engine Using Engine using Field Default • Programmable Program PCM.Field Default Rating Rating. Low power (lowest parameters for the PCM

rating in engine class) and incorrectly programmedvehicle features not in module. working.

623 — Invalid Engine Invalid EFRC. • Wrong EFRC selected for Check the EFRC and verifyFamily Rating Code the PCM strategy that it matches the PCM(EFRC) programmed in the strategy level. Reprogram

module the PCM or change theEFRC as necessary.

624 — Field Default Vehicle features not • Programmable Program PCM.Active functioning (Low power - parameters for the PCM

lowest rating in engine incorrectly programmedclass). in module

(Continued)

2004 F650/F750 6.0L Diesel



626 — Unexpected Reset DTC 626 is set when • Loose or dirty The scan tool can be usedFault power is interrupted to the connections at battery or to display the ignition

PCM. Turning the ignition ground cables can cause switch voltage measuredOFF and then ON will the PCM to power down by the PCM. Monitor thecause the code to change • DTC 626 will not turn the voltage at PCM pins X4-1from active to inactive amber ENGINE indicator and X4-2.status. on

• Intermittent connectionsin the power feed wiring

DTC 631 - Read Only Internal ROM fault. • Internal PCM fault Install a new PCM.Memory (ROM) Self-TestFault

DTC 632 - Random Internal RAM fault. • Internal PCM fault. Install a new PCM.Access Memory (RAM) -CPU Self-Test Fault

655 — Programmable Programmable parameter • Programming problem or Program PCM.Parameter List Level list level incompatible. internal PCM problem.Incompatible

661 — RAM RAM programmable • Internal PCM problem. Install a new PCM.Programmable Parameter parameter list corrupt. TheList Corrupt DTC will cause a no start

or the engine to run in fielddefaults.

664 — Calibration Level Calibration level • Programmable problem Program PCM.Incompatible. incompatible. The DTC will or internal PCM problem.

cause a no start or theengine to run in fielddefaults.

665 — Programmable Programmable parameter • Internal PCM problem. Install a new PCM.Parameter Memory memory content corrupt.Content Corrupt The DTC will cause a no

start or the engine to run infield defaults.

2004 F650/F750 6.0L Diesel

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