Diagnosis Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.

Refer to "GROUND INSPECTION ".

Fig 1: Identifying Body Ground (E9 And E15) And Washer Tank With Fuse And Fusible Link Box

Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG 

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect engine coolant temperature (ECT) sensor (1) harness connector.
   • ←: Vehicle front
2. Turn ignition switch ON.
   Fig 2: Identifying Engine Coolant Temperature (ECT) Sensor

   Courtesy of NISSAN NORTH AMERICA, INC.
3. Check voltage between ECT sensor terminal 1 and ground with CONSULT or tester.

Voltage: Approximately 5 V 

Fig 3: Checking ECT Sensor Power Supply Circuit

Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG 

OK: GO TO 3.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 52 and ECT sensor terminal 2.

   Refer to Wiring Diagram .

   Continuity should exist  .

4. Also check harness for short to ground and short to power.

OK or NG 

OK: GO TO 4.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 5.

NG: Replace engine coolant temperature sensor. Refer to , "COMPONENT ".

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END