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: Checking Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK:GO TO 2.
2. NG:Repair or replace ground connections.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor (intake air temperature sensor is built-into) harness connector.
3. Turn ignition switch ON.
  
  Fig 2: Disconnecting Mass Air Flow Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between mass air flow sensor terminal 2 and ground.
  
  Fig 3: Checking Voltage Between Mass Air Flow Sensor And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Voltage: Approximately 5V
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connectors.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector.
4. Check harness continuity between mass air flow sensor terminal 1 and ECM terminal 67, TCM terminal 42.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
5. Also check harness for short to ground or short to power.
OK or NG
1. OK: GO TO 5 .
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E19, F33
- Harness for open or short between intake air temperature sensor and ECM
- Harness for open or short between intake air temperature sensor and TCM
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 6.
2. NG: Replace mass air flow sensor (with intake air temperature sensor).
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END