Circuit Description
The coolant temperature telltale on the instrument panel cluster (IPC) has the ability to illuminate as a result of an engine over temperature condition. The engine control module (ECM) will send a message to the IPC over the class 2 link to turn the coolant temperature telltale ON if the engine coolant temperature (ECT) exceeds the temperature calibration value listed under Conditions for Setting the DTC.
DTC Descriptors
This diagnostic procedure supports the following DTC:
P0217 Engine Coolant Overtemperature
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The ECT is greater than 118°C (244°F). |
| • | No other ECT sensor DTCs have been set. |
| • | The ECM will command the A/C relay OFF if the temperature of the engine coolant is greater than 118°C (244°F). |
DTC P0217 diagnostic runs continuously once the above conditions have been met.
Conditions for Clearing the MIL/DTC
| • | The ECM will turn the malfunction indicator lamp (MIL) OFF after 3 consecutive trips that the diagnostic has been run and passed. |
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool. |
Diagnostic Aids
| • | Cooling fan inoperative--Refer to Cooling Fan Inoperative . |
| • | Engine cooling system overheated condition (thermostat, low engine coolant etc.)--Refer to Engine Overheating . |
| • | Radiator or condenser air flow restricted |
| • | Air dam missing or loose |
| • | Overload due to trailer towing |
| • | ECT sensor leaking engine coolant into ECT sensor harness connector causing elevated temperatures |
| • | ECT sensor skewed |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Check the engine cooling fans for proper operation. Are the engine cooling fans operative? | Go to Engine Overheating | |
