Procedure For Malfunction A

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

   Refer to "GROUND INSPECTION ".

   • <==: Vehicle front
   • Body ground (1)

OK or NG 

OK: GO TO 2.

NG: Repair or replace ground connections.

Fig 1: Identifying Body Ground

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

1. Disconnect heated oxygen sensor 2 harness connector (2).
   • <==: Vehicle front
   • Heated oxygen sensor 2 (1)
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 59 and HO2S2 terminal 1. Refer to WIRING DIAGRAM .

   Continuity should exist. 

   Fig 2: Identifying Heated Oxygen Sensor 2

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Also check harness for short to ground and short to power.

OK or NG 

OK: GO TO  4.

NG: GO TO 3.

Check the following.

• Harness connectors E17, F10
• Harness for open circuit or short between heated oxygen sensor 2 and ECM.

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

1. Check harness continuity between ECM terminal 50 and HO2S2 terminal 4.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

2. Check harness continuity between ECM terminal 50 or HO2S2 terminal 4 and ground. Refer to WIRING DIAGRAM .

   Continuity should not exist. 

3. Also check harness for short to power.

OK or NG 

OK: GO TO  6.

NG: GO TO 5.

Check the following.

• Harness connectors E17, F10
• Harness for open circuit or short between heated oxygen sensor 2 and ECM.

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

Check connectors for water.

Water should not exist. 

OK or NG 

OK: GO TO 7.

NG: Repair or replace harness or connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 8.

NG: Replace heated oxygen sensor 2.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END