Nissan Maxima. Manual - part 437

EC-232

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0137, P0157 HO2S2

7. Check the voltage between ECM harness connector terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK-II

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

JMBIA1865ZZ

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0137

F13

33

[HO2S2 (bank 1) 

signal]

35

(Sensor 
ground)

Revving up to 4,000 rpm under no 
load at least 10 times

The voltage should be above 0.78 V 
at least once during this procedure.

P0157

34

[HO2S2 (bank 2) 

signal]

JMBIA1866ZZ

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0137

F13

33

[HO2S2 (bank 1) 

signal]

35

(Sensor 
ground)

Keeping engine at idle for 10 min-
utes

The voltage should be above 0.78 V 
at least once during this procedure.

P0157

34

[HO2S2 (bank 2) 

signal]

P0137, P0157 HO2S2

EC-233

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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Check the voltage between ECM harness connector terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-233, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010094942

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

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 2.

NO

>> Repair or replace ground connection.

2.

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 P0171 or P0174 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171 or P0174. Refer to 

EC-261, "DTC Logic"

.

NO

>> GO TO 3.

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 the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness

connector.

JMBIA1867ZZ

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0137

F13

33

[HO2S2 (bank 1) 

signal]

35

(Sensor 
ground)

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

The voltage should be above 0.78 V 
at least once during this procedure.

P0157

34

[HO2S2 (bank 2) 

signal]

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0137

1

F62

1

F13

35

Existed

P0157

2

F56

1

EC-234

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0137, P0157 HO2S2

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

YES

>> GO TO 4.

NO

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

4.

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 5.

NO

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

5.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-235, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

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

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0137

1

F62

4

F13

33

Existed

P0157

2

F56

4

34

DTC

HO2S2

Ground

Continuity

Bank

Connector

Terminal

P0137

1

F62

4

Ground

Not existed

P0157

2

F56

4

DTC

ECM

Ground

Continuity

Connector

Terminal

P0137

F13

33

Ground

Not existed

P0157

34

P0137, P0157 HO2S2

EC-235

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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Component Inspection

INFOID:0000000010094943

1.

INSPECTION START

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item

with CONSULT.

7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to 

±25%.

: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is 

−25%.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 6.

3.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Check the voltage between ECM harness connector terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

JSBIA3451ZZ

ECM

Condition

Voltage

Con-

nector

+

–

Terminal

Terminal

F13

33

[HO2S2 

(bank 1) 

signal]

35

(Sensor 
ground)

Revving up to 4,000 
rpm under no load at 
least 10 times

The voltage should be 
above 0.78 V at least 
once during this proce-
dure.
The voltage should be 
below 0.18 V at least 
once during this proce-
dure.

34

[HO2S2 

(bank 2) 

signal]

JMBIA1865ZZ