Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to "GROUND INSPECTION  ".

Fig 1: Identifying Body Ground Location

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 2.
2. NG: Repair or replace ground connections.

1. Disconnect engine coolant temperature (ECT) sensor harness connector.
2. Turn ignition switch ON.
   Fig 2: Disconnecting Engine Coolant Temperature (ECT) Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between ECT sensor terminal 1 and ground with CONSULT-II or tester.
   1. 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 ECT Sensor Terminal 1 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67. Refer to WIRING DIAGRAM  .
   1. 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.

Refer to "COMPONENT INSPECTION  ".

OK or NG 

1. OK: GO TO 5.
2. NG: Replace engine coolant temperature sensor.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  ".

1. : INSPECTION END