Grand Marquis V8-4.6L Flex Fuel (2010)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Cylinder Head Temperature (CHT) Sensor
ENGINE CONTROL COMPONENTS
Cylinder Head Temperature (CHT) Sensor
The CHT sensor is a thermistor device in which resistance changes with the temperature. The electrical resistance of a thermistor decreases as
temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor
terminals and provides electrical signals to the PCM corresponding to temperature.
The CHT sensor is installed in the cylinder head and measures the metal temperature. The CHT sensor provides complete engine temperature
information and is used to infer coolant temperature. If the CHT sensor conveys an overheating condition to the PCM, the PCM initiates a fail-safe
cooling strategy based on information from the CHT sensor. A cooling system concern, such as low coolant or coolant loss, could cause an
overheating condition. As a result, damage to major engine components could occur. Using both the CHT sensor and fail-safe cooling strategy, the
PCM prevents damage by allowing air cooling of the engine and limp home capability. For additional information, refer to Powertrain Control
Software for Fail-Safe Cooling Strategy. See: Computers and Control Systems/Description and Operation/Powertrain Control Software
Typical CHT Sensor
