Procedure For Malfunction A

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Checking Ground Connections
  Courtesy of NISSAN NORTH AMERICA, INC.
OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector.
  
  Fig 2: Identifying Heated Oxygen Sensor 2 Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.
  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.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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

Refer to WIRING DIAGRAM .

TERMINALS REFERENCE

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

Continuity should exist.

Check harness continuity between the following terminals and ground.

Refer to WIRING DIAGRAM .

TERMINALS REFERENCE

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

Continuity should not exist.

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 HO2S2 CONNECTOR FOR WATER
Check connectors for water.

Water should not exist.

OK or NG

OK: GO TO 5.

NG: Repair or replace harness or connectors.
CHECK HEATED OXYGEN SENSOR 2
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace malfunctioning heated oxygen sensor 2.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END