Procedure For Malfunction A

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

   Refer to , "GROUND INSPECTION ".

   Fig 1: Identifying Body Ground Connections

   Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect ECM harness connector.
2. Disconnect heated oxygen sensor 2 harness connector.
   Fig 2: Identifying Heated Oxygen Sensor 2 Harness Connector

   Courtesy of NISSAN NORTH AMERICA, INC.
3. Check harness continuity between HO2S2 terminal 4 and ECM terminal 78.

   Refer to WIRING DIAGRAM.

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

OK or NG

OK: GO TO 3.

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

1. Check harness continuity between ECM terminal and HO2S2 terminal as follows.

   Refer to WIRING DIAGRAM.

   TERMINALS CONTINUITY CHART
   
   

   DTC	Terminals		Bank
   	ECM	Sensor
   P0138	74	1	1
   P0158	55	1	2

   Continuity should exist. 

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

   Refer to WIRING DIAGRAM.

   TERMINALS CONTINUITY CHART
   
   

   DTC	Terminals		Bank
   	ECM	Sensor
   P0138	74	1	1
   P0158	55	1	2

   Continuity should not exist. 

3. Also check harness for short to power.

OK or NG

OK: GO TO 4.

NG: 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 5.

NG: Repair or replace harness or connectors.

Refer to , "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace malfunctioning heated oxygen sensor 2.

Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END