Nissan Maxima. Manual - part 492

EC-452

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P2096, P2097, P2098, P2099 A/F SENSOR 1

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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

EC-24, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

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

3. Turn ignition switch ON.

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

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

6. Let engine idle for 1 minute.

7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.

8. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-452, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010095156

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.

RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2

Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to 

EM-31, "Exploded View"

.

>> GO TO 3.

3.

CHECK FOR EXHAUST GAS LEAK

1. Start engine and run it at idle.

2. Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas detected?

YES

>> Repair or replace.

NO

>> GO TO 4.

4.

CHECK FOR INTAKE AIR LEAKAGE

1. Start engine and run it at idle.

2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning part.

5.

CLEAR THE 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, P0172, P0174 or P0175 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to 

EC-261, "DTC Logic"

or 

EC-265, "DTC Logic"

.

NO

>> GO TO 6.

6.

CHECK HARNESS CONNECTOR

P2096, P2097, P2098, P2099 A/F SENSOR 1

EC-453

< DTC/CIRCUIT DIAGNOSIS >

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1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

3. Check that water is not inside connectors.
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness connector.

7.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect A/F sensor 1 harness connector.

2. Turn ignition switch ON.

3. Check the voltage between A/F sensor 1 harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• IPDM E/R harness connector F10

• 15 A fuse (No. 37)

• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

9.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector

and ground.

DTC

A/F sensor

Ground

Voltage (V)

Bank

Connector

Terminal

P2096
P2097

1

F12

4

Ground

Battery voltage

P2098
P2099

2

F61

4

PBIB3308E

DTC

A/F sensor 1

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P2096
P2097

1

F12

1

F13

45

Existed

2

49

P2098
P2099

2

F61

1

53

2

57

DTC

A/F sensor 1

Ground

Continuity

Bank

Connector

Terminal

P2096
P2097

1

F12

1

Ground

Not existed

2

P2098
P2099

2

F61

1

2

EC-454

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P2096, P2097, P2098, P2099 A/F SENSOR 1

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

YES

>> GO TO 10.

NO

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

10.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-172, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 13.

11.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-235, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace heated oxygen sensor 2. Refer to 

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

 (LH) or 

EM-33,

"Removal and Installation (RH)"

 (RH).

12.

CHECK INTERMITTENT INCIDENT

Perform 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or replace malfunctioning part.

13.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to 

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

 (LH) or

EM-33, "Removal and Installation (RH)"

 (RH).

CAUTION:

• Discard any A/F 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 A/F 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).

Do you have CONSULT?

YES

>> GO TO 14.

NO

>> GO TO 15.

14.

CONFIRM A/F ADJUSTMENT DATA

With CONSULT

1. Turn ignition switch ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Make sure that “0.000” is displayed on CONSULT screen.
Is “0.000” displayed?

YES

>> INSPECTION END

NO

>> GO TO 15.

15.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

Clear the mixture ratio self-learning value. Refer to 

EC-24, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

DTC

ECM

Ground

Continuity

Connector

Terminal

P2096
P2097

F13

45

Ground

Not existed

49

P2098
P2099

53

57

P2096, P2097, P2098, P2099 A/F SENSOR 1

EC-455

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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Do you have CONSULT?

YES

>> GO TO 16.

NO

>> INSPECTION END

16.

CONFIRM A/F ADJUSTMENT DATA

With CONSULT

1. Turn ignition switch ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Make sure that “0.000” is displayed on CONSULT screen.

>> INSPECTION END