Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK COOLING FAN OPERATION

With CONSULT
1. Turn ignition switch ON.
2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
3. Check that cooling fan speed varies according to the percentage.
Without CONSULT
1. Activate IPDM E/R auto active test and check cooling fan motors operation. Refer to DIAGNOSIS PROCEDURE .
2. Check that cooling fan operates.
Is the inspection result normal?

YES

GO TO STEP 2 .

NO

Proceed to DIAGNOSIS PROCEDURE .

CHECK COOLING SYSTEM FOR LEAK-I

Check cooling system for leak. Refer to SYSTEM INSPECTION .

Is leakage detected?

YES

GO TO STEP 3 .

NO

GO TO STEP 4 .

CHECK COOLING SYSTEM FOR LEAK-II

Check the following for leak.
- Hose (Refer to SYSTEM INSPECTION .)
- Radiator (Refer to SYSTEM INSPECTION .)
- Water pump (Refer to SYSTEM INSPECTION .)
Repair or replace malfunctioning part.

CHECK RADIATOR CAP

Check radiator cap. Refer to SYSTEM INSPECTION .

Is the inspection result normal?

YES

GO TO STEP 5 .

NO

Replace radiator cap. Refer to REMOVAL AND INSTALLATION .

CHECK THERMOSTAT

Check thermostat. Refer to REMOVAL AND INSTALLATION .

Is the inspection result normal?

YES

GO TO STEP 6 .

NO

Replace thermostat. Refer to REMOVAL AND INSTALLATION .

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to COMPONENT INSPECTION .

Is the inspection result normal?

YES

GO TO STEP 7 .

NO

Replace engine coolant temperature sensor. Refer to REMOVAL AND INSTALLATION .

OVERHEATING CAUSE ANALYSIS

If the cause cannot be isolated, check the TROUBLESHOOTING CHART .

INSPECTION END