Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to GROUND INSPECTION .
   Fig 1: Locating Ground Screws Of Body

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

OK or NG 

• OK: GO TO 2.
• NG: Repair or replace ground connections.

Loosen and retighten the air fuel ratio (A/F) sensor 1.

Fig 2: Loosening Air Fuel Ratio (A/F) Sensor 1

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

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

• GO TO 3.

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.
   Fig 3: CONSULT-II Display - Work Support Mode

   Courtesy of NISSAN MOTOR CO., U.S.A.
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 harness connector.
   Fig 4: Identifying Mass Air Flow Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Restart engine and let it idle for at least 3 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION .
8. Make sure DTC P0000 is displayed.
9. 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 or P0175. Refer to DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION .
• No: GO TO 4.

1. Turn ignition switch OFF.
2. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
   Fig 5: Locating Air Fuel Ratio (A/F) Sensor 1 Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check harness connector for water.

   Water should not exit. 

OK or NG 

• OK: GO TO 5.
• NG: Repair or replace harness connector.

1. Turn ignition switch ON.
2. Check voltage between air fuel ratio (A/F) sensor 1 terminal 3 and ground with CONSULT-II or tester.
   • Voltage: Battery voltage 
   Fig 6: Checking Voltage Between Air Fuel Ratio (A/F) Sensor 1 Connector Terminal 3 And Ground

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

OK or NG 

• OK: GO TO  7.
• NG: GO TO 6.

Check the following.

• Harness connectors E5, F14
• IPDM E/R connector E119
• 10A fuse
• Harness for open or short between air fuel ratio (A/F) sensor 1 and fuse
  • Repair or replace harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following terminals. Refer to Fig 7 and WIRING DIAGRAM .
   Fig 7: ECM Terminals And A/F Sensor 1 Terminals Reference Chart (Continuity)

   Courtesy of NISSAN MOTOR CO., U.S.A.
   • Continuity should exist. 
4. Check harness continuity between the following terminals and ground. Refer to Fig 8 and WIRING DIAGRAM .
   Fig 8: ECM Terminals And A/F Sensor 1 Terminals Reference Chart (Continuity To Ground)

   Courtesy of NISSAN MOTOR CO., U.S.A.
   • Continuity should not exist. 
5. Also check harness for short to ground and short to power.

OK or NG 

• OK: GO TO 8.
• NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to COMPONENT INSPECTION .

OK or NG 

• OK: GO TO 9.
• NG: GO TO  10.

Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG 

• OK: GO TO 10.
• NG: Repair or replace.

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

• INSPECTION END