programmed-fuel injection dtc troubleshootingpg4 6 3 1 2 r/bu w/bl r/bu w/bl indicator lamp (mil)...

PROGRAMMED-FUEL INJECTION

DTC TROUBLESHOOTINGDTC INDEX

DTC MIL Detected component Probable cause Ref. page

0 or does not commu-

nicate

MIL does not come ON/blink

ECM • Loose or poor contact of theconnector

• Faulty indicator light • Open circuit in MIL wire • Open circuit in ECM power/

ground cable • Faulty ECM

0 or does not commu-

nicate

MIL stay ON ECM • SCS service check connector activated

• Short circuit in DLC wire • Short circuit in MIL wire • Short circuit in sensor power cir-

cuit • Faulty ECM

0-20-50-8

ON ECM (Internal failure) • Faulty ECM 5-21

3-1 ON MAP sensor (voltage too low) • Loose or poor contact of theconnector

• Short circuit in MAP sensor wire(PB)

• Open circuit in MAP sensor wire(VCC1)

• Faulty MAP sensor

3-2 ON MAP sensor (voltage too high) • Loose or poor contact of theconnector

• Open circuit in MAP sensor wire(PB)

• Open circuit in MAP sensor wire(VCC1)

• Open circuit in MAP sensor wire(SG1)

• Faulty MAP sensor

4-1 ON CKP sensor (no pulse) • Loose or poor contact of theconnector

• Open or short circuit in CKPsensor wire (CRK)

• Open circuit in CKP sensor wire(IGP2)

• Open circuit in CKP sensor wire(LG1)

• Faulty CKP sensor

4-2 ON CKP sensor (abnormal pulse) • Loose or poor contact of theconnector

• Faulty CKP sensor • CKP sensor is not installed

properly

6-1 ON ECT sensor 1(voltage too low)

• Loose or poor contact of theconnector

• Short circuit in ECT sensor 1wire (TE)

• Faulty ECT sensor 1

6-2 ON ECT sensor 1(voltage too high)

• Open circuit in ECT sensor 1wire (TE)

• Open circuit in ECT sensor 1wire (SG2)

61ZY600Y.book 14 ページ２０１０年５月１３日　木曜日　午後８時４０分

7-1 ON TP sensor (voltage too low) • Loose or poor contact of theconnector

• Open or short circuit in TP sen-sor wire (THL)

• Open circuit in TP sensor wire(VCC2)

• Faulty TP sensor

7-2 ON TP sensor (voltage too high) • Loose or poor contact of theconnector

• Open circuit in TP sensor wire(SG2)

• Faulty TP sensor

8-1 ON CMP sensor (no pulse) • Loose or poor contact of theconnector

• Open or short circuit in CMPsensor wire (TDC)

• Open circuit in CMP sensor wire(IGP2)

• Open circuit in CMP sensor wire(LG1)

• Faulty CMP sensor

8-2 ON CMP sensor (abnormal pulse) • Loose or poor contact of theconnector

• Faulty CMP sensor • CMP sensor is not installed

properly

10-1 ON IAT sensor (voltage too low) • Loose or poor contact of theconnector

• Short circuit in IAT sensor wire(TA)

• Faulty IAT sensor

10-2 ON IAT sensor (voltage too high) • Loose or poor contact of theconnector

• Open circuit in IAT sensor wire(TA)

• Open circuit in IAT sensor wire(SG2)

• Faulty IAT sensor

14-1 ON IAC valve (abnormal current) • Loose or poor contact of theconnector

• Open or short circuit in IACvalve wire (EACVP)

• Open or short circuit in IACvalve wire (EACVM)

• Faulty IAC valve

21-1 (BF150AK0

ON VTEC solenoid valve (abnormal signal)

• Open or short circuit in VTECsolenoid valve wire (VTS)

• Faulty VTEC solenoid valve

22-1 ON EOP sensor (voltage too low) • Loose or poor contact of theconnector

• Short circuit in EOP sensor wire(POIL)

• Open circuit in EOP sensor wire(VCC2)

• Faulty EOP sensor

22-2 ON EOP sensor (voltage too high) • Loose or poor contact of theconnector

• Open circuit in EOP sensor wire(POIL)

• Open circuit in EOP sensor wire(VCC2)

• Open circuit in EOP sensor wire(SG2)

• Faulty EOP sensor

23-1 ON Knock sensor (abnormal detec-tion)

• Open or short circuit in knocksensor wire (KS)

• Faulty knock sensor

41-3 ON A/F sensor heater (abnormal high current or low cur-rent)

• Open or short circuit in A/F sen-sor heater wire (LAFR)

• Open circuit in A/F sensor heat-er wire (AFHT+)

• Open or short circuit in A/F sen-sor heater wire (AFHT)

• Faulty A/F sensor heater • Faulty A/F sensor heater relay

41-4 ON A/F sensor heater (abnormal current)

• Short circuit in A/F sensor heat-er wire (AFHT) and A/F sensorwire (AFC)

• Short circuit in A/F sensor heat-er wire (AFHT) and A/F sensorwire (AFV)

• Short circuit in A/F sensor heat-er wire (AFHT+) and A/F sensorwire (AFC)

• Short circuit in A/F sensor heat-er wire (AFHT+) and A/F sensorwire (AFV)

• Open or short circuit in A/F sen-sor heater wire (LAFR)

• Open circuit in A/F sensor heat-er wire (AFHT+)

• Open or short circuit in A/F sen-sor heater wire (AFHT)

• Faulty A/F sensor heater • Faulty A/F sensor heater relay

48-5 ON A/F sensor(open circuit in A/F sensor wire(AFV/AFC))

• Open circuit in A/F sensor wire(AFV)

• Open circuit in A/F sensor wire(AFC)

48-6 ON A/F sensor(short circuit in A/F sensor wire(AFV))

• Short circuit in A/F sensor wire(AFV)

48-7 ON A/F sensor(short circuit in A/F sensor wire(AFC))

• Short circuit in A/F sensor wire(AFC)

140-1 ON ECT sensor 2 (voltage too low) • Loose or poor contact of theconnector

• Short circuit in ECT sensor 2wire (TOH1)

140-2 ON ECT sensor 2 (voltage too high) • Loose or poor contact of theconnector

• Open circuit in ECT sensor 2wire (TOH1)

MIL IS ON BUT DTC IS 0 OR DOES NOT COMMUNICATE

1. DLC power/GND line open circuit inspectionTurn the combination switch OFF and disconnectthe HDS.

Turn the combination switch ON.Measure the voltage at the DLC No.3(Yellow/Red) terminal and No.2 (Black) terminal.

Is battery voltage present?YES – GO TO STEP 2.

NO – • Repair open in the Yellow/Black wire. • Repair open in the Black wire. • If main wire harness is normal, inspect

the No.10 fuse circuit into the fuse/relayjunction box (page 18-8).

BlackYellowBlueGreenRedWhite Gray

PinkLight greenLight blueOrangeBrown

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TRIMANGLESENSOR

R/BlBr/W G/R

W/RBr/Y302015

MAP SENSORTP SENSOR

17 3 2624

G/Bl G/Bl BlW/Bl W/Bl BlBl

K-LINE

G G/Bl

JOINTCONNECTOR 2

JOINTCONNECTOR 1

No. 5FUSE(10 A)

No. 9FUSE(15 A)

No. 10FUSE(10 A)

INDICATORLAMP(MIL)

R/BuR/Bu WARNL

BATBl/YBl/Y

COMBINATIONSWITCH

OPTION

BATW/BlW/Bl

Bl/YBl/Y

IGP3(Yellow/Red)

GND 2(Black)

2. DLC signal line short circuit inspection

Measure the voltage between the DLC No.4(Light green) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – GO TO STEP 3.

NO – Repair short in the Light green wire.

3. MIL ON line short circuit inspectionTurn the combination switch OFF.Disconnect ECM connector A .

Turn the combination switch ON and check the MIL.

Does the MIL go OFF?YES – GO TO STEP 4.

NO – Repair short in the main wire harnessbetween the ECM and the MIL.

4. MAP sensor power line short circuit inspection 1Turn the combination switch OFF.Connect ECM connector A .Disconnect the MAP sensor 3P connector .

Does the MIL go OFF?YES – Replace the MAP sensor.

NO – GO TO STEP 5.

5. MAP sensor power line short circuit inspection 2Measure the voltage between the MAP sensor 3Pconnector main wire harness side No.1(Brown/Yellow) terminal and engine ground.

NO – Repair short in the Brown/Yellow wire.

6. TP sensor power line short circuit inspection 1Turn the combination switch OFF.Disconnect the TP sensor 3P connector .

Does the MIL go OFF?YES – Replace the TP sensor.

SCS(Light green)

MAP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

VCC1(Brown/Yellow)

7. TP sensor power line short circuit inspection 2Measure the voltage between the TP sensor 3Pconnector main wire harness side No.1(Brown/White) terminal and engine ground.

NO – Repair short in the Brown/White wire.

8. Trim angle sensor power line short circuitinspection 1Turn the combination switch OFF.Disconnect the trim angle sensor 3P connector

Does the MIL go OFF?YES – Replace the trim angle sensor.

9. Trim angle sensor power line short circuitinspection 2Measure the voltage between the trim angle sensor3P connector main wire harness side No.3(Light green/Black) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace the ECM with a new one and

recheck.

NO – Repair short in the Light green/Black wire.

TP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

VCC2(Brown/White)

TRIM ANGLE SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

VCC3(Light green/Black)

DTC 0-2, 0-5, 0-8 (INTERNAL FAILURE OF ECM)1. Reappearance test

Turn the combination switch ON and wait for onesecond or more.

Clear the DTC (page 5-5).

• Continue the procedure if the DTC does notclear.

Start the engine and recheck the DTC using theHDS.

Does the DTC 0-2, 0-5, 0-8 appear? YES – Replace the ECM with a new one and

recheck

NO – Temporary failure (code does notreappear)

DTC 3-1, 3-2 (MAP SENSOR VOLTAGE TOO LOW OR TOO HIGH)

DTC 3-1 (MAP SENSOR VOLTAGE IS TOO LOW)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the MAP sensor 3P connector ,ECM connector A , and ECM connector B

, and then reconnect them.

Turn the combination switch ON.Measure the MAP sensor voltage using the HDS.

Is the measurement within 0.23 – 4.49 V? YES – Temporary failure (code does not

reappear).

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SENSOR

2. MAP sensor signal line short circuit inspectionTurn the combination switch OFF and disconnectthe MAP sensor 3P connector .

Turn the combination switch ON.

Measure the voltage between the MAP sensor 3Pconnector main wire harness side No.2(White/Red) terminal and engine ground.

NO – Repair short in the White/Red wire. If themain wire harness is correct, replace theECM with a new one and recheck.

3. MAP sensor power line open circuit inspectionMeasure the voltage between the MAP sensor 3Pconnector main wire harness side No.1(Brown/Yellow) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace the MAP sensor with a new one

and recheck.

NO – Repair open in the Brown/Yellow wire. Ifthe main wire harness is correct, replacethe ECM with a new one and recheck.

DTC 3-2 (MAP SENSOR VOLTAGE IS TOO HIGH)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the MAP sensor 3P connector ,ECM connector A , and ECM connector B

Turn the combination switch ON.Measure the MAP sensor voltage using the HDS.

reappear).

PB(White/Red)

VCC1(Brown/Yellow)

2. MAP sensor power line open circuit inspectionTurn the combination switch OFF and disconnectthe MAP sensor 3P connector .

Turn the combination switch ON.Measure the voltage between the MAP sensor 3Pconnector main wire harness side No.1(Brown/Yellow) terminal and engine ground.

NO – Repair open in the Brown/Yellow wirer. Ifthe main wire harness is correct, replacethe ECM with a new one and recheck.

3. MAP sensor signal/GND line open circuitinspectionMeasure the voltage between the MAP sensor 3Pconnector main wire harness side No.2(White/Red) terminal and No.3 (Green/Red)terminal.

Is the measurement within 4.75 – 5.25 V?YES – Replace the MAP sensor with a new one

and recheck.

NO – • Repair open in the White/Red wire. • Repair open in the Green/Red wire. • If the main wire harness is correct,

replace the ECM with a new one, andrecheck

VCC1(Brown/Yellow)

PB(White/Red)

SG1(Green/Red)

DTC 4-1, 4-2 (NO CKP SENSOR PULSE OR ABNORMAL CKP SENSOR PULSE)

DTC 4-1 (NO CKP SENSOR PULSE)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the CKP sensor 3P connector ,ECM connector A , and joint connector 1

Start the engine and check the DTC using the HDS.

Does the DTC 4-1 appear? YES – GO TO STEP 2.

NO – Temporary failure (code does notreappear).

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3CKP SENSOR

G/Bl G/Bl

JOINTCONNECTOR 1

No. 9FUSE (15 A)

2. CKP sensor power line open circuit inspectionTurn the combination switch OFF and disconnectthe CKP sensor 3P connector .

Measure the voltage between the CKP sensor 3Pconnector main wire harness side No.3(Yellow/Black) terminal and engine ground.

Does battery voltage exist? YES – GO TO STEP 3.

NO – Repair open in the Yellow/Black wire. Ifmain wire harness is normal, inspect theNo.9 fuse circuit into the fuse/relayjunction box (page 18-8).

3. CKP sensor signal line open or short circuit/GND line open circuit inspectionMeasure the voltage between the CKP sensor 3Pconnector main wire harness side No.1 (Blue)terminal and No.2 (Green/Black) terminal.

Is the measurement within 4.75 – 5.25 V? YES – Replace the CKP sensor with a new one

and recheck.

NO – • Repair open or short in the Blue wire. • Repair open in the Green/Black wire. • If the main wire harness is correct,

replace the ECM with a new one, andrecheck.

DTC 4-2 (ABNORMAL CKP SENSOR PULSE)1. Symptom reproduction test

Turn the combination switch OFF.

Disconnect the CKP sensor 3P connector ,ECM connector A , and joint connector 1

NO – Temporary failure (disappears).

2. CKP sensor installation inspectionTurn the combination switch OFF.

Check the installation of the CKP sensor (Base shopmanual: page 5-151).

Is the CKP sensor installation correct?YES – Replace the CKP sensor with a new one

and recheck. If the CMP sensor isreplaced, but DTC 4-2 still appears,replace the ECM with a new one andrecheck.

NO – Install the CKP sensor properly, andrecheck.

CKP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

IGP2(Yellow/Black)

LG1(Green/Black)

CRK(Blue)

CKP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

DTC 6-1, 6-2 (ECT SENSOR 1 VOLTAGE IS TOO LOW OR TOO HIGH)

DTC 6-1 (ECT SENSOR 1 VOLTAGE IS TOO LOW)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the ECT sensor 1 (2P) connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the ECT sensor 1 voltage using the HDS.

reappear).

2. ECT sensor 1 signal line short circuit inspectionTurn the combination switch OFF and disconnectthe ECT sensor 1 (2P) connector .

Turn the combination switch ON.Measure the voltage between the ECT sensor 1(2P) connector main wire harness side No.1(Red/White) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace the ECT sensor 1 with a new one

and recheck.

NO – Repair short in the Red/White wire. If themain wire is correct, replace the ECM witha new one and recheck.

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ECT SENSOR 15V

G/RG/R

JOINTCONNECTOR 2

612 13

ECT SENSOR 1 (2P) CONNECTORMAIN WIRE HARNESS SIDE

TE(Red/White)

DTC 6-2 (ECT SENSOR 1 VOLTAGE IS TOO HIGH) • When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2,

141-2, and 143-2 are indicated at the same time, theground line (SG2) is open.

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the ECT sensor 1 (2P) connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

reappear).

2. ECT sensor 1 signal/GND line open circuitinspectionTurn the combination switch OFF and disconnectthe ECT sensor 1 (2P) connector .

Turn the combination switch ON.Measure the voltage between the ECT sensor 1(2P) connector main wire harness side No.1(Red/White) terminal and No.2 (Green/Red)terminal.

and recheck.

NO – Repair open in the Red/White wire orGreen/Red wire. If the main wire harnessis correct, replace the ECM with a new oneand recheck.

612 13

TE(Red/White)

SG2(Green/Red)

DTC 7-1, 7-2 (TP SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)

DTC 7-1 (TP SENSOR VOLTAGE IS TOO LOW) • When the DTC code 7-1 and 22-1 or 22-2 are

indicated at the same time, the power line (VCC2) isopen.

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the TP sensor 3P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.Clear the DTC (page 5-5).

Turn the combination switch ON.Measure the TP sensor voltage using the HDS.

reappear).

2. TP sensor power/signal line open circuitinspectionTurn the combination switch OFF and disconnectthe TP sensor 3P connector .

Turn the combination switch ON.Measure the voltage between the TP sensor 3Pconnector main wire harness side No.1(Brown/White) terminal and No.2 (Red/Black)terminal.

NO – • Repair open in the Brown/White wire. • Repair open in the Red/Black wire. • If the main wire harness is correct,

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SENSOR

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G/RG/R

JOINTCONNECTOR 2

2012 13

TP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

VCC2(Brown/ White)

THL(Red/Black)

3. TP sensor signal line short circuit inspectionTurn the combination switch OFF.Disconnect ECM connector A .

Check for continuity between the TP sensor 3Pconnector main wire harness side No.2 (Red/Black) terminal and engine ground.

Is there continuity?YES – Repair short in the Red/Black wire.

NO – Replace the throttle body with a new oneand recheck.

DTC 7-2 (TP SENSOR VOLTAGE IS TOO HIGH) • When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2,

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the TP sensor 3P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the TP sensor voltage using the HDS.

reappear).

2. TP sensor inspectionTurn the combination switch ON and measure theTP sensor voltage using the HDS.

Is the measurement within 4.49 – 4.85 V whenthe throttle is fully open and within 0.44 – 0.56 Vwhen the throttle is fully closed?YES – Replace the ECM with a new one and

recheck.

NO – Repair the open circuit in the Green/Redwire. If the main wire harness is correct,replace the throttle body with a new oneand recheck.

2012 13

DTC 8-1, 8-2 (NO CMP SENSOR PULSE OR ABNORMAL CMP SENSOR PULSE)

DTC 8-1 (NO CMP SENSOR PULSE)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the CMP sensor 3P connector ,ECM connector A , and joint connector 1

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7CMP SENSOR

No. 9FUSE (15 A)

JOINTCONNECTOR 1

2. CMP sensor power line open circuit inspectionTurn the combination switch OFF and disconnectthe CMP sensor 3P connector .

Measure the voltage between the CMP sensor 3Pconnector main wire harness side No.3(Yellow/Black) terminal and engine ground.

Does battery voltage exist? YES – GO TO STEP 3.

NO – Repair open in the Yellow/Black wire. Ifmain wire harness is normal, inspect theNo.9 fuse circuit into the fuse/relayjunction box (page 18-8).

3. CMP sensor signal line open or short circuit/GND line open circuit inspectionMeasure the voltage between the CMP sensor 3Pconnector main wire harness side No.1(Green) terminal and No.2 (Green/Black) terminal.

Is the measurement within 4.75 – 5.25 V? YES – Replace the CMP sensor with a new one

and recheck.

NO – • Repair open or short in the Green wire. • Repair open in the Green/Black wire. • If the main wire harness is correct,

DTC 8-2 (ABNORMAL CMP SENSOR PULSE)1. Symptom reproduction test

Turn the combination switch OFF.

Disconnect the CMP sensor 3P connector ,ECM connector A , and joint connector 1

NO – Temporary failure (disappears).

2. CMP sensor installation inspectionTurn the combination switch OFF.

Check the installation of the CMP sensor (Baseshop manual: page 5-150).

Is the CMP sensor installation correct?YES – Replace the CMP sensor with a new one

and recheck. If the CMP sensor isreplaced, but DTC 8-2 still appears,replace the ECM with a new one andrecheck.

NO – Install the CMP sensor properly, andrecheck.

CMP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

IGP2(Yellow/Black)

CMP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

LG1(Green/Black)

TDC(Green)

DTC 10-1, 10-2 (IAT SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)

DTC 10-1 (IAT SENSOR VOLTAGE IS TOO LOW)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the IAT sensor 2P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the IAT sensor voltage using the HDS.

reappear).

2. IAT sensor signal line short circuit inspectionTurn the combination switch OFF and disconnectthe IAT sensor 2P connector .

Turn the combination switch ON.Measure the voltage between the IAT sensor 2Pconnector main wire harness side No.1 (Red/Yellow) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace the IAT sensor with a new one

and recheck.

NO – Repair short in the Red/Yellow wire. If themain wire is correct, replace the ECM witha new one and recheck.

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IAT SENSOR

G/RG/R

JOINTCONNECTOR 2

2512 13

IAT SENSOR 2P CONNECTORMAIN WIRE HARNESS SIDE

25TA(Red/Yellow)

DTC 10-2 (IAT SENSOR VOLTAGE IS TOO HIGH) • When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2,

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the IAT sensor 2P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the IAT sensor voltage using the HDS.

reappear).

2. IAT sensor signal line open circuit inspectionTurn the combination switch OFF and disconnectthe IAT 2P connector .

Turn the combination switch ON.Measure the voltage between the IAT sensor 2Pconnector main wire harness side No.1 (Red/Yellow) terminal and No.2 (Green/Red) terminal.

Is the measurement within 4.75 – 5.25 V?YES – Replace the IAT sensor with a new one

and recheck.

NO – Repair open in the Red/Yellow wire orGreen/Red wire. If the main wire harnessis correct, replace the ECM with a new oneand recheck.

2512 13

IAT SENSOR 2P CONNECTORMAIN WIRE HARNESS SIDE

TA(Red/Yellow)

SG2(Green/Red)

DTC 14-1 (ABNORMAL IAC VALVE CURRENT)

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the IAC valve 2P connector andECM connector B , and then reconnect them.

2. IAC valve inspectionTurn the combination switch OFF and disconnectthe IAC valve 2P connector .

Inspect the IAC valve (page 5-89).

Is the IAC valve correct?YES – Repair open or short in the Green/White

wire or Black wire between the ECM andIAC valve. If main wire harness is correct,replace the ECM with a new one andrecheck.

NO – Replace the IAC valve with a new one andrecheck.

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DTC 21-1 (ABNORMAL VTEC SOLENOID VALVE SIGNAL) (BF150AK0 only)

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the VTEC solenoid valve 1P connector

and ECM connector B , and thenreconnect them.

Start the engine and let it run at 3,000 min-1 (rpm) for5 minutes or more under no load until the enginetemperature is over 85 °C (185 °F).

Disconnect the neutral switch 2P connector .

Raise the engine speed slowly and let it run at 4,500min-1 (rpm) for a few seconds.

Recheck the DTC with the HDS.

2. VTEC solenoid valve inspectionTurn the combination switch OFF and disconnectthe VTEC solenoid valve 1P connector .

Inspect the VTEC solenoid valve (page 5-89).

Is the VTEC solenoid valve correct?YES – Repair open in the Green/Yellow wire

between the ECM and VTEC solenoidvalve. If main wire harness is correct,replace the ECM with a new one andrecheck.

NO – Replace the VTEC solenoid valve with anew one and recheck.

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VTECSOLENOIDVALVE

G/WG/Y G/W

DTC 22-1, 22-2 (EOP SENSOR VOLTAGE TOO LOW OR TOO HIGH)

DTC 22-1 (EOP SENSOR VOLTAGE IS TOO LOW) • When the DTC code 7-1 and 22-1 or 22-2 are

indicated at the same time, the power line (VCC2) isopen.

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the EOP sensor 3P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the EOP sensor voltage using the HDS.

reappear).

2. EOP sensor signal line short circuit inspectionTurn the combination switch OFF and disconnectthe EOP sensor 3P connector .

Measure the voltage between the EOP sensor 3Pconnector main wire harness side No.2(Yellow/Red) terminal and engine ground.

NO – Repair short in the Yellow/Red wire. If themain wire harness is correct, replace theECM with a new one and recheck.

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SENSOR

G/RG/R

JOINTCONNECTOR 2

712 13

EOP SENSOR 3P CONNECTORMAIN WIRE HARNESS SIDE

POIL(Yellow/Red)

3. EOP sensor power line open circuit inspectionMeasure the voltage between the EOP sensor 3Pconnector main wire harness side No.1(Brown/White) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace the EOP sensor with a new one

and recheck.

NO – Repair open in the Brown/White wire. If themain wire harness is correct, replace theECM with a new one and recheck.

DTC 22-2 (EOP SENSOR VOLTAGE IS TOO HIGH) • When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2,

• When the DTC code 7-1 and 22-1 or 22-2 areindicated at the same time, the power line (VCC2) isopen.

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the EOP sensor 3P connector ,ECM connector A , ECM connector B ,and joint connector 2 , and then reconnectthem.

Turn the combination switch ON.Measure the EOP sensor voltage using the HDS.

reappear).

2. EOP sensor power line open circuit inspectionTurn the combination switch OFF and disconnectthe EOP sensor 3P connector .

Turn the combination switch ON.Measure the voltage between the EOP sensor 3Pconnector main wire harness side No.1(Brown/White) terminal and engine ground.

NO – Repair open in the Brown/White wire. If themain wire harness is correct, replace theECM with a new one and recheck.

VCC2(Brown/White)

712 13

VCC2(Brown/White)

3. EOP sensor signal/GND line open circuitinspectionMeasure the voltage between the EOP sensor 3Pconnector main wire harness side No.2(Yellow/Red) terminal and No.3 (Green/Red)terminal.

Is the measurement within 4.75 – 5.25 V?YES – Replace the EOP sensor with a new one

and recheck.

NO – • Repair open in the Yellow/Red wire. • Repair open in the Green/Red wire. • If the main wire harness is correct,

replace the ECM with a new one, andrecheck

DTC 23-1 (ABNORMAL KNOCK SENSOR DETECTION)

1. Symptom reproduction testTurn the combination switch OFF.Disconnect the knock sensor 1P connector and ECM connector B , and then reconnectthem.

Start the engine and let it run at 3,000 min-1 (rpm) for5 minutes or more under no load until the enginetemperature is over 85 °C (185 °F).Lower the engine speed gradually and run it at3,000 – 4,000 min-1 (rpm) for 10 seconds.

POIL(Yellow/Red)

SG2(Green/Red)

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SENSOR

2. Knock sensor line open or short circuitinspectionTurn the combination switch OFF.Disconnect the knock sensor 1P connector and ECM connector B .

Check for open and short circuit between the knocksensor 1P connector main wire harness sideNo.1 (Red/Blue) terminal and ECM connector B

No.29 (Red/Blue) terminal.

Is the knock sensor line open or short?YES – Repair open or short in the Red/Blue wire.

NO – Replace the knock sensor with a new oneand recheck. If the knock sensor isreplaced, but DTC 23-1 still appears,replace the ECM with a new one andrecheck.

DTC 41-3, 41-4 (ABNORMAL A/F SENSOR HEATER CURRENT)

DTC 41-3 (ABNORMAL A/F SENSOR HEATER HIGH CURRENT OR LOW CURRENT)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the A/F sensor 4P connector ,fuse/relay junction box 23P connector , fuse/relay junction box 10P connector , and ECMconnector A , and then reconnect them.

Check the DTC using the HDS.

MAINRELAY

A/FSENSORRELAY

A/F SENSORHEATER

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BATTERY

FUSE/RELAY JUNCTION BOX

WW W/Bl

Bl/YBl

No. 3FUSE(30 A)

No. 4FUSE(30 A)

No. 5FUSE(10 A)

OPTION

COMBINATION SWITCH

15161617

JOINTCONNECTOR 1

Bl/YW/Bl

2. Fuse inspectionTurn the combination switch OFF.

Check for blown No.3 fuse.

Is the fuse blown?YES – Replace the blown fuse and check for

short in the main wire harness or incorrectload by referring to the fuse load chart(page 2-17).

3. A/F sensor heater inspectionTurn the combination switch OFF.

Inspect the A/F sensor heater (page 5-90).

Is the A/F sensor heater correct?YES – GO TO STEP 4.

NO – Replace the A/F sensor with a new oneand recheck.

4. A/F sensor heater relay inspectionInspect the A/F sensor heater relay (page 18-6).

Is the A/F sensor heater relay correct?YES – GO TO STEP 5.

NO – Replace the A/F sensor heater relay with anew one and recheck.

5. Fuse/relay junction box inspectionInspect the A/F sensor heater relay circuit into thefuse/relay junction box (page 18-8).

Is the fuse/relay junction box correct?YES – • Repair open in the White wire between

the fuse/relay junction box and A/Fsensor

• Repair open in the White wire betweenthe ECM and fuse/relay junction box

• Repair open or short in the Black/Whitewire between the ECM and A/F sensor

• Repair open or short in the Green/yellow wire between the ECM and fuse/relay junction box

• If the wire harness is normal, replacethe ECM with a new one and recheck

NO – Replace the fuse/relay junction box with anew one and recheck.

DTC 41-4 (ABNORMAL CURRENT)1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the A/F sensor 4P connector ,fuse/relay junction box 23P connector , fuse/relay junction box 10P connector , and ECMconnector A , and then reconnect them.

Check the DTC using the HDS.

2. Fuse inspectionTurn the combination switch OFF.

Check for blown No.3 fuse.

Is the fuse blown?YES – Replace the blown fuse and check for

short in the main wire harness or incorrectload by referring to the fuse load chart(page 2-17).

3. A/F sensor heater inspectionTurn the combination switch OFF.

Inspect the A/F sensor heater (page 5-90).

Is the A/F sensor heater correct?YES – GO TO STEP 4.

NO – Replace the A/F sensor with a new oneand recheck.

4. A/F sensor heater relay inspectionInspect the A/F sensor heater relay (page 18-6).

Is the A/F sensor heater relay correct?YES – GO TO STEP 5.

NO – Replace the A/F sensor heater relay with anew one and recheck.

5. Fuse/relay junction box inspectionInspect the A/F sensor heater relay circuit into thefuse/relay junction box (page 18-8).

Is the fuse/relay junction box correct?YES – GO TO STEP 6.

NO – Replace the fuse/relay junction box with anew one and recheck.

6. A/F sensor line short circuit inspection

Disconnect the ECM connector A .

Check for continuity between the followingterminals.

– A/F sensor 4P connector main wireharness side No.1 (Black/yellow) terminal andECM connector A main wire harness sideNo.18 (Black/White) terminal

– A/F sensor 4P connector main wireharness side No.2 (White/Black) terminal andECM connector A main wire harness sideNo.18 (Black/White) terminal

– A/F sensor 4P connector main wireharness side No.1 (Black/yellow) terminal andECM connector A main wire harness sideNo.36 (White) terminal

– A/F sensor 4P connector main wireharness side No.2 (White/Black) terminal andECM connector A main wire harness sideNo.36 (White) terminal

Is there continuity?YES – • Repair short in the Black/yellow wire

and Black/White wire between the ECMand A/F sensor.

• Repair short in the White/Black wireand Black/White wire between the ECMand A/F sensor.

• Repair short in the Black/yellow wireand White wire between the ECM andA/F sensor.

• Repair short in the White/Black wireand White wire between the ECM andA/F sensor.

NO – • Repair open in the White wire betweenthe fuse/relay junction box and A/Fsensor.

• Repair open in the White wire betweenthe ECM and fuse/relay junction box.

• Repair open or short in the Black/Whitewire between the ECM and A/F sensor.

• Repair open or short in the Green/Yellow wire between the ECM andfuse/relay junction box.

• If the wire harness is normal, replacethe A/F sensor with a new one andrecheck.

• If the A/F sensor is replaced, but DTC41-4 still appears, replace the ECMwith a new one and recheck.

DTC 48-5, 48-6, 48-7 (ABNORMAL A/F SENSOR CURRENT)

DTC 48-5 (OPEN CIRCUIT IN A/F SENSOR WIRE (AFV/AFC))1. Symptom reproduction test

Turn the combination switch OFF.Disconnect the A/F sensor 4P connector andECM connector A , and then reconnect them.

Start the engine and let it run at 3,000 min-1 (rpm) for5 minutes or more under no load until the enginetemperature is over 85 °C (185 °F).Then run the engine at 3,000 min-1 (rpm) for 1minute.

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A/F SENSOR

FROMFUSE/RELAYJUNCTION BOX

Bl/WAFHT

2. A/F sensor line open circuit inspectionTurn the combination switch OFF.Disconnect the A/F sensor 4P connector andECM connector A .

Check for open circuit between the A/F sensor 4Pconnector main wire harness side No.1(Black/Yellow) terminal and ECM connector A main wire harness side No.27 (Black/Yellow)terminal.

Check for open circuit between the A/F sensor 4Pconnector main wire harness side No.2(White/Black) terminal and ECM connector A main wire harness side No.28 (White/Black)terminal.

Is the A/F sensor line open?YES – Repair open in the Black/Yellow wire or

White/Black wire.

NO – Replace the A/F sensor with a new oneand recheck. If the A/F sensor is replaced,but DTC 48-5 still appears, replace theECM with a new one and recheck.

DTC 48-6 (SHORT CIRCUIT IN A/F SENSOR (AFV))1. Symptom reproduction test

2. A/F sensor AFV line short circuit inspectionTurn the combination switch OFF.Disconnect the A/F sensor 4P connector andECM connector A .

Check for continuity between the A/F sensor 4Pconnector main wire harness side No.2(White/Black) terminal and engine ground.

Is there continuity?YES – Repair short in the White/Black wire

between the ECM and A/F sensor.

DTC 48-7 (SHORT CIRCUIT IN A/F SENSOR (AFC))1. Symptom reproduction test

2. A/F sensor AFC line short circuit inspectionTurn the combination switch OFF.Disconnect the A/F sensor 4P connector andECM connector A .

Check for continuity between the A/F sensor 4Pconnector main wire harness side No.1(Black/Yellow) terminal and engine ground.

Is there continuity?YES – Repair short in the Black/Yellow wire

between the ECM and A/F sensor.

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 2(2P) connector main wire harness side No.1(Red/Black) terminal and engine ground.

and recheck.

NO – Repair short in the Red/Black wire. If themain wire is correct, replace the ECM witha new one and recheck.

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ECT SENSOR 2

G/R G/R

JOINTCONNECTOR 2

112 13

TOH1(Red/Black)

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 2(2P) connector main wire harness side No.1(Red/Black) terminal and No.2 (Green/Red)terminal.

and recheck.

NO – Repair open in the Red/Black wire orGreen/Red wire. If the main wire harnessis correct, replace the ECM with a new oneand recheck.

112 13

TOH1(Red/Black)

SG2(Green/Red)

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 3(2P) connector main wire harness side No.1(Red) terminal and engine ground.

Is the measurement within 4.75 – 5.25 V?YES – Replace ECT sensor 3 with a new one and

recheck.

NO – Repair short in the Red wire. If the mainwire is correct, replace the ECM with anew one and recheck.

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ECT SENSOR 3

G/RG/R

JOINTCONNECTOR 2

812 13

TOH2(Red)

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 3(2P) connector main wire harness side No.1(Red) terminal and No.2 (Green/Red) terminal.

recheck.

NO – Repair open in the Red wire or Green/Redwire. If the main wire harness is correct,replace the ECM with a new one andrecheck.

812 13

TOH2(Red)

SG2(Green/Red)

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 4(2P) connector main wire harness side No.1(Red/Yellow) terminal and engine ground.

recheck.

NO – Repair short in the Red/Yellow wire. If themain wire is correct, replace the ECM witha new one and recheck.

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ECT SENSOR 4

G/RG/R

JOINTCONNECTOR 2

212 13

TOH3(Red/Yellow)

reappear).

Turn the combination switch ON.Measure the voltage between the ECT sensor 4(2P) connector main wire harness side No.1(Red/Yellow) terminal and No.2 (Green/Red)terminal.

recheck.

NO – Repair open in the Red/Yellow wire orGreen/Red wire. If the main wire harnessis correct, replace the ECM with a new oneand recheck.

212 13

SG2(Green/Red)

TOH3(Red/Yellow)

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