Hot-Stop Engine Message

TEST CONDITION(S)
NONE

FAILURE CONDITION(S)
1. Conditions for Flashing Coolant Gage are met for greater than 240 seconds.
or
1. Engine is running.
2. Coolant temperature is in a valid range.
3. Coolant temperature is greater than 135 degrees centigrade.
or
2. Coolant temperature is in a valid range.
3. Coolant temperature is greater than 126 degrees centigrade.
4. Coolant level is low.
or
1. Engine is running.
2. Coolant temperature is in a valid range.
3. Coolant temperature is greater than 126 degrees centigrade.
4. I-Terminal (on generator) failure detected.

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

DESCRIPTION
The PCM provides 5 volts to the coolant temperature sensor circuit. The PCM supplies and internally monitors the voltage level of the circuit at pin 2B9. The coolant temperature sensor is a thermistor, so as the coolant temperature goes from cold to hot, the sensors resistance goes from high to low, and the voltage level the PCM detects at pin 2B9 goes from high to low. Every 1 second the BCM checks the PCM for the coolant temperature. If the failure conditions for Flashing Coolant Gage exist for more than 240 seconds, or the calculated coolant temperature reaches 135 degrees centigrade 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 STOP ENGINE" message to the IPC and will activate the fast paced chime on the chime module.

DIAGNOSIS
Refer to engine overheat diagnosis in Cooling Systems. Cooling System