Diagnostic Procedure

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

   Refer to "GROUND INSPECTION ".

   Fig 1: Checking Ground Connections

   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.
   Fig 2: Identifying Engine Coolant Temperature Sensor (1) Harness Connector

   Courtesy of NISSAN NORTH AMERICA, INC.
2. Turn ignition switch ON.
3. Check voltage between ECT sensor (1) terminal 1 and ground with CONSULT-II or tester.

   Voltage: Approximately 5V 

OK or NG 

OK: GO TO  4.

NG: GO TO 3.

Fig 3: Checking Voltage Between ECT Sensor Terminal 1 And Ground

Courtesy of NISSAN NORTH AMERICA, INC.

Check the following.

• Harness connector F26, F101
• Harness for open or short between ECM and engine coolant temperature sensor

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 ECT sensor terminal 2 and ECM terminal 67.

   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  6.

NG: GO TO 5.

Check the following.

• Harness connector F26, F101
• Harness for open and short between ECT sensor and ECM

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 7.

NG: Replace engine coolant temperature sensor.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END