Engine Temperature Sensor: Description and Operation

Cylinder Head Temperature Sensor (CHT)


AllData Editor's Note:
"Ford provides conflicting information regarding usage of a coolant temperature sensor for this vehicle/engine. While service and repair information indicates use of a coolant temperature sensor, the diagnostic procedures and wiring diagrams indicate a coolant temperature sensor is not used on this model/engine combination."

From the Powertrain Control/Emissions Diagnosis OBDII Manual:

On applications that do not use a ECT sensor, the CHT sensor is used to determine the engine coolant temperature in place of the ECT sensor. In this case the PCM may store both CHT and ECT Diagnostic Trouble Codes (DTCs). To cover the entire temperature range of both the CHT and ECT sensors, the PCM has a dual switching resistor circuit on the CHT input.


For trouble code and pinpoint related testing refer to: "Powertrain Management : Computers and Control Systems : Testing and Inspection" Testing and Inspection