Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body.
   Fig 1: Locating Ground Screws

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

   Refer to Ground Inspection  .

OK or NG 

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

1. Disconnect heated oxygen sensor 2 harness connector.
   Fig 2: Locating Bank 1 & 2 HO2S

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check harness continuity between HO2S2 terminal 4 and body ground. Refer to Wiring Diagram  .

   Continuity should exist. 

3. Also check harness for short to power.

OK or NG 

1. OK >> GO TO  4.
2. NG >> GO TO  3.

Check the following.

• Harness connectors E5, F14
• Harness for open or short between heated oxygen sensor 2 and body ground

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

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal and HO2S2 terminal as follows.Wiring Diagram 
   Fig 3: Checking HO2S2 Input Signal Circuit For Open And Short

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

   Continuity should exist. 

3. Check harness continuity between the following terminals and ground.Wiring Diagram 
   Fig 4: Checking Harness Continuity

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

   Continuity should not exist. 

4. Also check harness for short to ground and 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.

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

   Water should not exist. 

OK or NG 

1. OK >> GO TO  6.
2. NG >> Repair or replace harness or connectors.

Refer to Component Inspection  .

OK or NG 

1. OK >> GO TO  7.
2. NG >> Replace malfunctioning heated oxygen sensor 2.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

1. >> INSPECTION END