Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION .
  
  Fig 1: Loosening And Retighten Ground Three Screws On Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 air fuel ratio (A/F) sensor 1 harness connector.
  
  Fig 2: Disconnecting Air Fuel Ratio (A/F) Sensor 1 Harness Connector
  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.
  
  Fig 3: Checking Voltage Between A/F Sensor 1 Terminal 3 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Battery voltage
OK or NG
1. OK: GO TO 4 .
2. NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- IPDM E/R harness connector E122
- 15A 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 the following terminals.
  Refer to WIRING DIAGRAM .
  
  Fig 4: Checking Harness Continuity Between Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
4. Check harness continuity between the following terminals and ground.
  
  Fig 5: Checking Harness Continuity Between Terminals And Ground
  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 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.