Mustang GT V8-4.6L SOHC VIN X (1998)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
The Engine Coolant Temperature sensor (ECT sensor):
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changes resistance in response to the engine coolant temperature.
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decreases resistance as the surrounding temperature increases, providing a signal to the Powertrain Control Module (PCM) that indicates the
engine coolant temperature.
NOTE: In some applications of the 4.6L engine, the Cylinder Head Temperature (CHT) sensor provides the signal used by the Powertrain Control
Module (PCM) in place of the Coolant Temperature Sensor (CTS) for functions such as, but not limited to, activating the electric cooling fans.
