Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to "Ground Inspection ".
   Fig 1: Locating Ground Screws

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

OK or NG 

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

1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
   Fig 2: Air Fuel Ratio Sensor 1 (Bank 1 And 2) Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester.

   Voltage: Battery voltage 

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO 3.
   Fig 3: Checking Voltage Between A/F Sensor 1 Terminal 3 And Ground With Tester

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

Check the following.

• Harness connectors M72, F102
• Harness connectors E108, M15
• IPDM E/R harness connector E7
• 15A fuse
• Harness for open or short between A/F sensor 1 and fuse

1. : 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 Wiring Diagram.
   Fig 4: Air Fuel Ratio Sensor 1 Terminal And ECM Terminal Relating Table 1 (For Continuity Checking Between Terminal)

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

   Continuity should exist. 

4. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram.
   Fig 5: Air Fuel Ratio Sensor 1 Terminal And ECM Terminal Relating Table 2 (For Continuity Checking Between Terminal And Ground)

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

   Continuity should not exist. 

5. Also check harness for short to power.

OK or NG 

1. OK: GO TO 5.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

OK or NG 

1. OK: Replace A/F sensor 1.
2. NG: Repair or replace.