Diagnostic Test
- CHECK THE POWERTRAIN CONTROL MODULE (PCM) SOFTWARE LEVEL NOTE:
An aftermarket block heater installed may cause this DTC to set.
- Turn the ignition on.
- With the scan tool, Verify that the PCM is operating at the latest software version available.
- Perform any Service Bulletins or PCM flash updates that may apply.
Were any Service Bulletins or PCM flash updates available for this condition?
Yes
- Perform the appropriate repair.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
No
- Go To 2
- CHECK THE AAT SENSOR OPERATION
- Turn the ignition off.
- Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above -7°C (19.4°F) until the engine coolant temperature is equal, or close to the environmental ambient temperature.
- Turn the ignition on.
- With a scan tool, compare the AAT Sensor value to the current ambient temperature.
Is the AAT Sensor value within 10°C (18°F) of the current ambient temperature?
Yes
- Go To 3
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION . .
- LOW COOLANT LEVEL WARNING:
Never open the cooling system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury including extreme burns, scalding, or fatal injury. Allow the engine to cool before opening the cooling system.
- Check the cooling system to make sure that the coolant is in good condition and at the proper level. Refer to LEVEL CHECK
.
Is the coolant level and condition OK?
Yes
- Go To 4
No
- Inspect the vehicle for a coolant leak and add the necessary amount of coolant. Refer to SPECIFICATIONS .
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
- Check the cooling system to make sure that the coolant is in good condition and at the proper level. Refer to LEVEL CHECK
.
- CHECK THE COOLING SYSTEM OPERATION NOTE:
If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C (149°F).
- Start the engine.
- During engine warm-up monitor the Engine Coolant Temperature degree value. The temperature value change should be a smooth transition from start up to normal operating temp 82°C (180°F). Also monitor the actual coolant temperature with a digital thermometer at or near the ECT Sensor and Thermostat positions.NOTE:
As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the scan tool Engine Coolant Temperature degree values should stay relatively close to each other.
Was the digital thermometer readings relatively close to the scan tool reading for the ECT Sensor?
Yes
- Go To 5
No
- Replace the ECT Sensor in accordance with the Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
- POWERTRAIN CONTROL MODULE (PCM)
- Using the wiring diagram/schematic as a guide, inspect Powertrain Control Module power and ground circuits.
- Look for any chafed, pierced, pinched, or partially broken wires.
- Look for broken, bent, pushed out or corroded terminals.
- Monitor the scan tool data and wiggle the wiring and connectors.
- Look for the any data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
No
- Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
- Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .