Nissan Maxima. Manual - part 439

EC-240

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0138, P0158 HO2S2

Check the voltage between ECM harness connector terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-240, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010094947

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

JMBIA1866ZZ

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0138

F13

33

[HO2S2 (bank 1) 

signal]

35

(Sensor 
ground)

Keeping engine speed at idle for 10 
minutes

The voltage should be below 0.18 V 
at least once during this procedure.

P0158

34

[HO2S2 (bank 2) 

signal]

JMBIA1867ZZ

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0138

F13

33

[HO2S2 (bank 1) 

signal]

35

(Sensor 
ground)

Coasting from 80 km/h (50 MPH) in D 
position

The voltage should be below 0.18 V 
at least once during this procedure.

P0158

34

[HO2S2 (bank 2) 

signal]

P0138, P0158 HO2S2

EC-241

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1.

INSPECTION START

Confirm the detected malfunction (A or B). Refer to 

EC-237, "DTC Logic"

.

Which malfunction is detected?

A

>> GO TO 2.

B

>> GO TO 9.

2.

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in 

GI-44, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace ground connection.

3.

CHECK HO2S2 CONNECTOR FOR WATER

1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

2. Check that water is not inside conductors.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness or connectors.

4.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check the continuity between HO2S2 harness connector and ECM harness connector.

3. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between HO2S2 harness connector and ECM harness connector.

2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and

ground.

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F62

1

F13

35

Existed

P0158

2

F56

1

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F62

4

F13

33

Existed

P0158

2

F56

4

34

DTC

HO2S2

Ground

Continuity

Bank

Connector

Terminal

P0138

1

F62

4

Ground

Not existed

P0158

2

F56

4

EC-242

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0138, P0158 HO2S2

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-244, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to 

EM-31, "Removal and Installation (LH)"

 (LH) or 

EM-

33, "Removal and Installation (RH)"

 (RH).

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant

(commercial service tool).

>> INSPECTION END

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

9.

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in 

GI-44, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace ground connection.

10.

CLEAR MIXTURE RATIO SELF-LEARNING VALUE

1. Clear the mixture ratio self-learning value. Refer to 

EC-24, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

2. 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

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

EC-265, "DTC Logic"

.

NO

>> GO TO 11.

11.

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 the continuity between HO2S2 harness connector and ECM harness connector.

DTC

ECM

Ground

Continuity

Connector

Terminal

P0138

F13

33

Ground

Not existed

P0158

34

P0138, P0158 HO2S2

EC-243

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

5. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 12.

NO

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

12.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between HO2S2 harness connector and ECM harness connector.

2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and

ground.

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 13.

NO

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

13.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-244, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 14.

14.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to 

EM-31, "Removal and Installation (LH)"

 (LH) or 

EM-

33, "Removal and Installation (RH)"

 (RH).

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant

(commercial service tool).

>> INSPECTION END

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F62

1

F8

13

Existed

P0158

2

F56

1

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F62

4

F13

33

Existed

P0158

2

F56

4

34

DTC

HO2S2

Ground

Continuity

Bank

Connector

Terminal

P0138

1

F62

4

Ground

Not existed

P0158

2

F56

4

DTC

ECM

Ground

Continuity

Connector

Terminal

P0138

F13

33

Ground

Not existed

P0158

34