Engine Temperature High and Critical Chime

The engine temperature critical chime will warn the driver that the vehicle's engine is overheating. While monitoring the coolant temperature, the Powertrain Control Module (PCM) will send on the PCI data bus as engine temperature every 1.376 seconds to the cluster. The MIC calculates engine temperature and determines if a warning should occur. This feature is functional only with the Ignition Switch in the Run/Start position.

When the engine temperature reaches 122 °C (252 °F) the MIC requests a chime from the BCM and the engine temperature lamp comes ON. The MIC turns OFF the lamp when the engine temperature reaches 117 °C (242 °F). The MIC will chime continuously (request from the BCM). The chime will turn OFF after four minutes or when the temperature reaches 117 °C (242 °F), which ever occurs first.