Coolant Temperature Sensor/Switch (For Computer): Description and Operation

The Engine Coolant Temperature (ECT) sensor:
- Sends the PCM a signal indicating engine temperature.
- Resistance decreases as coolant temperature increases.

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.