2. Check Radiator Coolant Temperature Sensor Power Supply Circuit

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect radiator coolant temperature sensor harness connector.
Turn ignition switch ON.

Fig 1: Identifying Radiator Coolant Temperature Sensor Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between radiator coolant temperature sensor terminal 1 and ground with CONSULT-II or tester.

Fig 2: Checking Voltage Between Radiator Coolant Temperature Sensor Terminal 1 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Voltage: Approximately 5V

OK or NG

OK: GO TO 4. CHECK RADIATOR COOLANT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .
NG: GO TO 3.