DTC Confirmation Test (Overall Function Check)

For DTC P0217, malfunction is detected when engine coolant temperature is excessively high under normal engine speed. Possible causes are:

• Cooling fan circuit open or shorted.
• Defective cooling fan motor.
• Defective thermostat.
• Incorrect ignition timing.
• Defective ECT sensor.
• Radiator plugged.
• Front end damage.
• Blocked air passage.
• Improper coolant mixture ratio.
• Damaged bumper.

For DTC P1217, malfunction is detected when engine overheats. Possible causes are:

• Cooling fan circuit open or shorted.
• Defective cooling fan motor.
• Coolant leak.
• Radiator plugged.
• Defective water pump.
• Defective thermostat.

1. To check overall function of cooling system, allow engine to cool. Check coolant level in reservoir tank and radiator. If coolant level is low, go to PROCEDURE . If coolant level is okay, go to next step.
2. Check coolant mixture ratio. If coolant mixture ratio is not 45-55 percent, change coolant. Start engine and run until air is purged from system. Ensure A/C is turned off and compressor is not operating. If compressor is operating, repair A/C system. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If compressor is not operating, go to next step.
3. Turn ignition off. Disconnect ECT sensor harness connector. See Figure. Connect a 150-ohm resistor between ECT sensor harness connector terminals. Start engine. If cooling fan operates, go to next step. If cooling fan does not operate, go to PROCEDURE .
4. Ensure coolant is flowing through radiator. Check for blocked radiator or condenser fins. Check for damaged grille or improper air dam installation. Repair as necessary. If no problems are found, go to next step.
5. Check operation of ECT sensor. See step  4 under PROCEDURE. Repair as necessary. If ECT sensor is okay, check ignition timing. See ON-VEHICLE ADJUSTMENTS article. Adjust, if necessary.