1. Check ECT Sensor Power Supply Circuit

1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature (ECT) sensor harness connector.
3. Turn ignition switch ON.
   Fig 1: Locating ECT Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. 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 2.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Fig 2: Check ECT Sensor Power Supply Circuit

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