Hot - Idle Engine

CTS Circuit:

DESCRIPTION:

The ECM provides 5.0 volts to the coolant temperature sensor circuit. The ECM supplies and internally monitors the voltage level of the circuit at pin 3D4. The coolant temperature sensor is a thermistor, so as the coolant temperature goes from cold to hot, the sensor's resistance goes from high to low, and the voltage level the ECM detects at pin 3D4 goes from high to low. Every 1.0 second the BCM checks the ECM for the coolant temperature. If the failure conditions for the flashing coolant gauge exist for more than 120.0 seconds, or the calculated coolant temperature reaches 130°C and/or all other failure conditions have been met, the IPC will cause the coolant temperature gauge bars to flash. The BCM will send the "HOT IDLE ENGINE" message to the IPC and will activate the fast paced chime on the chime module.

TEST CONDITIONS:

NONE.

FAILURE CONDITIONS:

1. Conditions for "Flashing Coolant Gauge" are met for greater than 120.0 seconds.
OR
2. Engine is running.
3. Coolant temperature is in a valid range.
4. Coolant temperature is greater than 130°C.

ACTION TAKEN:

1. Display the "HOT IDLE ENGINE" message on the IPC.
2. Flash the coolant temperature gauge bars.
3. Activate the fast paced chime of the chime module.