Stop Engine - Engine Overheated

PCM Circuit:

CIRCUIT DESCRIPTION:
The Powertrain Control Module (PCM) provides and internally monitors voltage to the Engine Coolant Temperature (ECT) sensor circuit through pin "1B5." As the coolant temperature changes from cold to hot, the sensor's resistance changes from high to low and therefore the sensor voltage that the PCM monitors will change from high to low. When the calculated engine coolant temperature is greater than 131°C (low voltage), the PCM tells the Instrument Panel Cluster (IPC) to turn "ON" the "STOP ENGINE - ENGINE OVERHEATED" message on the Driver Information Center (DIC).

TEST CONDITION(S):
1. Engine running.

FAILURE CONDITION(S):
1. Engine coolant temperature greater than 131°C.

ACTION TAKEN:
1. "STOP ENGINE - ENGINE OVERHEATED" message is displayed on the DIC.
2. IPC turns "ON" the "CHECK INFO CENTER" telltale.
3. The PCM will activate a chime to alert the driver to the condition.

DIAGNOSIS:
1. If Code P014 is set, diagnose it first.
2. If Code P014 is not set, go to Cooling System for engine overheated diagnosis.