Engine Coolant Temp Telltale Indicator Lamp
ENGINE COOLANT TEMP/LOW COOLANT/AUTO TRANS FLUID TEMP TELLTALE INDICATOR LAMPThe PCM monitors the inputs of the engine coolant temperature (ECT) sensor, transmission fluid temperature sensor and the coolant level switch to determine if the engine coolant temperature, automatic transmission fluid temperature and coolant level are within normal operating ranges.
When either of the sensors signals a temperature that is above the specified range or the coolant level switch opens due to a low coolant level in the coolant surge tank, the PCM will ground circuit 35 and turns the engine coolant temp/low coolant/auto trans fluid temp telltale indicator lamp On to inform the operator of the vehicle that one of the above conditions has occurred. During engine start-up the engine coolant temp/low coolant/auto trans fluid temp telltale indicator lamp is turned On by the PCM for a bulb check.