Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

RETIGHTEN HEATED OXYGEN SENSOR 1
1. Turn ignition switch OFF.
2. Loosen and retighten corresponding heated oxygen sensor 1.
  
  Fig 1: Retightening Corresponding Heated Oxygen Sensor 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Tightening torque: 40 - 50 N.m (4.1 - 5.1 kg-m, 30 - 37 ft-lb)
1. : GO TO 2.
CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 1 harness connector.
  Bank 1
  
  Fig 2: Disconnecting Heated Oxygen Sensor 1 Harness Connector - Bank 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Bank 2
  
  Fig 3: Disconnecting Heated Oxygen Sensor 1 Harness Connector - Bank 2
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 terminal as follows. Refer to Wiring Diagram .
  
  Fig 4: Terminal Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
4. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram .
  
  Fig 5: Terminal Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should not exist.
5. Also check harness for short to power.
OK or NG
1. OK : GO TO 3.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK HO2S1 CONNECTOR FOR WATER
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 harness connector.
3. Check connectors for water.
  Water should not exist.
OK or NG
1. OK : GO TO 4.
2. NG : Repair or replace harness or connectors.
CHECK HEATED OXYGEN SENSOR 1
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 5.
2. NG : Replace malfunctioning heated oxygen sensor 1.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END