Engine Coolant Temperature

The engine coolant temperature indicator is illuminated by the IPC based on the coolant temperature information from the powertrain control module (PCM), or when the PCM sends a class 2 message requesting illumination via the class 2 serial data line. The IPC displays one of the following messages on the driver message center:
^ ENGINE COOLANT HOT, IDLE ENGINE
^ STOP ENGINE, ENGINE OVERHEATED

The IPC illuminates the indicator during bulb check.