L100 L4-2.2L VIN F (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 PCM controls the Coolant
Temperature telltale by sending a message to the BCM, which sends a message to the I/P cluster over the Class II link to turn On the telltale. The PCM
will send the message when the ECT sensor reading is above 118°C (244°F). If this condition exists, the PCM will set DTC P0217. 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.
