Diagnosis Procedure

1. Start engine and let it idle.
2. Make sure that cooling fan (crankshaft driven) operates normally.

OK or NG 

OK (With CONSULT-III): GO TO 2.

OK (Without CONSULT-III): GO TO  3.

NG: Check cooling fan (crankshaft driven). Refer to "REMOVAL AND INSTALLATION (CRANKSHAFT DRIVEN TYPE) ".

With CONSULT-III 

1. Start engine and let it idle.
2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-III.
3. Make sure that cooling fan operates.

OK or NG 

OK: GO TO  4.

NG: Check cooling fan control circuit. (Go to "PROCEDURE A ".)

Without CONSULT-III 

1. Disconnect engine coolant temperature sensor harness connector.
2. Connect 150Ω resistor to engine coolant temperature sensor harness connector.
3. Start engine and let it idle.
4. Make sure that cooling fan operates.

OK or NG 

OK: GO TO 4.

NG: Check cooling fan control circuit. (Go to "PROCEDURE A ".)

Fig 1: Connecting 150 Resistor To Engine Coolant Temperature Sensor Harness Connector

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

Refer to "INSPECTION ".

OK or NG 

OK: GO TO 5.

NG: Check the following for leak.

• Hose
• Radiator
• Radiator cap
• Water pump
• Reservoir tank

Check the following.

• RESERVOIR TANK CAP (Refer to "INSPECTION ".)
• Thermostat. (Refer to "REMOVAL AND INSTALLATION ".)
• Engine coolant temperature sensor. (Refer to "COMPONENT INSPECTION ".)

OK or NG 

OK: GO TO 7.

NG: Replace malfunctioning component.

If the cause cannot be isolated, go to "MAIN 13 CAUSES OF OVERHEATING ".

INSPECTION END