Infiniti M35/M45 Y50. Manual - part 633

DTC P0138, P0158 HO2S2

EC-1005

[VK45DE]

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2. 

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Disconnect ECM harness connector.

4.

Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.
Refer to Wiring Diagram.

5.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

3. 

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.

2.

Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

1.

Air fuel ratio (A/F) sensor 1 (bank 1)

2.

Heated oxygen sensor 2 (bank 1)

3.

Heated oxygen sensor 2 (bank 1)
harness connector

4.

Heated oxygen sensor 2 (bank 2)
harness connector

5.

Heated oxygen sensor 2 (bank 2)

6.

Air fuel ratio (A/F) sensor 1 (bank 2)

Continuity should exist.

PBIB2711E

DTC

Terminals

Bank

ECM

Sensor

P0138

55

1

1

P0158

74

1

2

Continuity should exist.

DTC

Terminals

Bank

ECM

Sensor

P0138

55

1

1

P0158

74

1

2

Continuity should not exist.

EC-1006

[VK45DE]

DTC P0138, P0158 HO2S2

4. 

CHECK HO2S2 CONNECTOR FOR WATER

Check connectors for water.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness or connectors.

5. 

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-1009, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace malfunctioning heated oxygen sensor 2.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

PROCEDURE FOR MALFUNCTION B

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to 

EC-864, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

Water should not exist.

1.

Body ground M70

2.

Body ground M16

PBIB2782E

DTC P0138, P0158 HO2S2

EC-1007

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EC

2. 

CLEAR THE SELF-LEARNING DATA

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode
with CONSULT-II.

3.

Clear the self-learning control coefficient by touching “CLEAR”.

4.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF.

3.

Disconnect mass air flow sensor (1) harness connector, and
restart and run engine for at least 5 seconds at idle speed.

4.

Stop engine and reconnect mass air flow sensor harness con-
nector.

5.

Make sure DTC P0102 is displayed.

6.

Erase the DTC memory. Refer to 

EC-770, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

 .

7.

Make sure DTC P0000 is displayed.

8.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?

Yes or No

Yes

>> Perform trouble diagnosis for DTC P0172, P0175. Refer to 

EC-1033

 .

No

>> GO TO 3.

SEF968Y

PBIB2682E

EC-1008

[VK45DE]

DTC P0138, P0158 HO2S2

3. 

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Disconnect ECM harness connector.

4.

Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.
Refer to Wiring Diagram.

5.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

4. 

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.

2.

Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

1.

Air fuel ratio (A/F) sensor 1 (bank 1)

2.

Heated oxygen sensor 2 (bank 1)

3.

Heated oxygen sensor 2 (bank 1)
harness connector

4.

Heated oxygen sensor 2 (bank 2)
harness connector

5.

Heated oxygen sensor 2 (bank 2)

6.

Air fuel ratio (A/F) sensor 1 (bank 2)

Continuity should exist.

PBIB2711E

DTC

Terminals

Bank

ECM

Sensor

P0138

55

1

1

P0158

74

1

2

Continuity should exist.

DTC

Terminals

Bank

ECM

Sensor

P0138

55

1

1

P0158

74

1

2

Continuity should not exist.