Diagnostic Procedure

CHECK GROUND CONNECTIONS
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.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector.
  
  Fig 2: Locating A/F Sensors
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK >> GO TO 4
2. NG >> GO TO 3.
  
  Fig 3: Check Voltage Between A/F Sensor 1 Terminal 3 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- IPDM E/R harness connector E119
- 10A fuse
- Harness for open or short between A/F sensor 1 and fuse
1. >> Repair or replace harness or connectors.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.
  Refer to Wiring Diagram.
  
  Fig 4: Check Harness Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
4. Check harness continuity between the previous terminals and ground.
  Refer to Wiring Diagram.
  1. Continuity should not exist.
5. Also check harness for 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.
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

OK or NG
1. OK >> Replace A/F sensor 1.
2. NG >> Repair or replace.