2. Check ECT Sensor Power Supply Circuit

1. Disconnect engine coolant temperature (ECT) sensor harness connector.
   Fig 1: Locating engine coolant temperature sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between ECT sensor terminal 1 and ground with CONSULT-II or tester.
   1. Voltage: Approximately 5V 

OK or NG 

OK: GO TO 4. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .

NG: GO TO 3.

Fig 2: Checking voltage between ECT sensor terminal 1 & ground

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