Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.

   Refer to "GROUND INSPECTION ".

   Fig 1: Identifying Multi-Remote Control Unit And Steering Member

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 2.

   NG: Repair or replace ground connections.

Loosen and retighten heated oxygen sensor 1.

Tightening torque: 50 N.m (5.1 kg-m, 37 ft-lb) 

GO TO 3.

Fig 2: Identifying Heated Oxygen Sensor 1

Courtesy of NISSAN MOTOR CO., U.S.A.

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 detected? 

   Is it difficult to start engine? 

Fig 3: Generic Scan Tool - Work Support

Courtesy of NISSAN MOTOR CO., U.S.A.

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 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 connector.
5. Make sure DTC P0102 is displayed.
6. Erase the DTC memory. Refer to "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 detected? 

   Is it difficult to start engine? 

Fig 4: Identifying Mass Air Flow (MAF) Sensor Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No 

Yes: Perform trouble diagnosis for DTC P0172. Refer to DTC P0172 FUEL INJECTION SYSTEM FUNCTION .

No: GO TO 4.

1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 harness connector.
3. Check connectors for water.

   Water should not exist. 

Fig 5: Identifying Heated Oxygen Sensor 1 Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 5.

NG: Repair or replace harness or connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 6.

NG: Replace heated oxygen sensor 1.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 7.

NG: Replace heated oxygen sensor 1.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END