Engine Coolant Temperature (ECT) Warning Indicator

The PCM receives the engine coolant temperature status through hardwired circuitry from the ECT sensor. Engine coolant temperature status is subsequently transmitted to the instrument cluster from the PCM over the communication network. The instrument cluster monitors the ECT data received from the PCM and commands the engine coolant temperature warning indicator on when the coolant temperature reaches 118°C (244°F), or higher. The engine coolant temperature warning indicator also serves as a fail-safe cooling warning indicator. When the PCM enters the fail-safe cooling mode, the engine coolant temperature warning indicator flashes to further alert the driver of the over-temperature condition.