Diagnosis Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Identifying Ground Connections Components
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  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 (with intake air temperature sensor) (1) harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Identifying Mass Air Flow (MAF) Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between mass air flow sensor terminal 5 and ground with CONSULT-III or tester.
  Voltage: Approximately 5V
  
  OK or NG
  
  OK : GO TO 3.
  
  NG : Repair open circuit or short to ground or short to power in harness or connectors.
  
  Fig 3: Checking Voltage Between Mass Air Flow Sensor Terminal 5 And 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 55.
  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