Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body.
  
  Fig 1: Locating Body Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Refer to GROUND INSPECTION .
OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Locating Mass Air Flow Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between mass air flow sensor terminal 5 and ground.
  Voltage: Approximately 5V
OK or NG

OK: GO TO 3.

NG: Repair harness or connectors.

Fig 3: Checking Voltage Between Mass Air Flow Sensor Terminal 5 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67.
  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 4.

NG: 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

OK: GO TO 5.

NG: Replace mass air flow sensor (with intake air temperature sensor).
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

: INSPECTION END