Diagnostic Procedure

CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect intake air temperature sensor harness connector.
3. Turn ignition switch ON.
  
  Fig 1: Disconnecting Intake Air Temperature Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
  Voltage : Approximately 5V
OK or NG
1. OK : GO TO 3.
2. NG : GO TO 2.
  
  Fig 2: Checking Voltage Between Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E43, M65
- Harness connectors M81, F36
- Harness for open or short between ECM and intake air temperature sensor
  1. : Repair harness or connectors.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between intake air temperature sensor terminal 2 and engine ground. Refer to WIRING DIAGRAM .
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK : GO TO 5.
2. NG : GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E43, M65
- Harness connectors M81, F36
- Harness for open or short between ECM and intake air temperature sensor
  1. : Repair open circuit or short to power in harness or connectors.
CHECK INTAKE AIR TEMPERATURE SENSOR
Check resistance as shown in the figure.

Fig 3: Checking Resistance
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 6.
2. NG : Replace intake air temperature sensor.
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END.