L300 V6-3.0L VIN R (2001)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temperature Telltale
The Coolant Temperature telltale is used to alert the driver that the engine may be in an overheated condition. The ECM controls the Coolant
Temperature telltale by sending a message to the BCM, which sends a message to the I/P cluster over the CAN link to turn On the telltale. The ECM will
send the message when the ECT sensor reading is above 140°C (284°F). If this condition exists, the ECM will set DTC P0117. If a high temp/low
voltage fault exists in the ECT sensor circuit, the signal is considered invalid and the Coolant Temperature telltale will NOT be illuminated. The cooling
fans will be commanded On high.
