Diagnostic Procedure

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

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

   Refer to GROUND INSPECTION .

OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect heated oxygen sensor 2 harness connector.
   Fig 2: Locating Heated Oxygen Sensor 2

   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

OK: GO TO  4.

NG: GO TO 3.

Check the following.

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

  : 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.

   Refer to Wiring Diagram.

   Fig 3: Checking Harness Continuity Between ECM Terminal And HO2S2 Terminal (Continuity Should Exist)

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

   Continuity should exist. 

3. Check harness continuity between the following terminals and ground.

   Refer to Wiring Diagram.

   Fig 4: Checking Terminals & Ground Harness Continuity Table (Continuity Should Not Exist)

   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

OK: GO TO 5.

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

OK: GO TO 6.

NG: Repair or replace harness or connectors.

Refer to COMPONENT INSPECTION .

OK or NG

OK: GO TO 7.

NG: Replace malfunctioning heated oxygen sensor 2.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

: INSPECTION END