Diagnostic Procedure

CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect mass air flow sensor (built-in intake air temperature sensor) harness connector.
  
  Fig 1: Disconnecting Mass Air Flow Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch "ON".
4. Check voltage between terminal 5 and ground.
  
  Fig 2: Checking Voltage Between Terminal 5 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approximately 5V
OK or NG
1. OK GO TO 2.
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 MAF sensor terminal 6 and ECM terminal 67, TCM terminal 42.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK GO TO 4 .
2. NG GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F22, M33
- Joint connector
- Harness for open or short between mass air flow sensor and ECM
- Harness for open or short between mass air flow 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 5.
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