Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground 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
1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Disconnecting Mass Air Flow Sensor (Intake Air Temperature Sensor Is Built-Into) Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between MAF sensor terminal 5 and ground with CONSULT-II or tester.
  Voltage: Approximately 5V
OK or NG
1. OK : GO TO 3.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
  
  Fig 3: Checking Voltage Between MAF 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 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
1. OK : GO TO 4.
2. 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
1. OK : GO TO 5.
2. NG : Replace intake air temperature sensor.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. >> INSPECTION END