Engine Coolant Temperature (ECT) Gage

The instrument panel cluster (IPC) displays the engine coolant temperature on the analog engine coolant temperature (ECT) gage as determined by the powertrain control module (PCM). The PCM monitors the signal circuit of the ECT sensor. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The IPC illuminates the check gages indicator when a high engine coolant temperature condition exists. The ECT gage defaults to 75°C (160°F) or below when one of the following conditions occur:

• The PCM detects a malfunction in the ECT sensor signal circuit.
• The IPC detects a loss of class 2 communication with the PCM.

For additional information on the engine cooling system, refer to Cooling System Description and Operation .