Engine Coolant Temperature (ECT) Sensor

DESCRIPTION
Detects the temperature of engine coolant and supplies the information to the powertrain control module. The ECT sensor is threaded into the heater outlet fitting or cooling passage on the engine. For engine control applications, the ECT signal is used to modify ignition timing, EGR flow, and air-to-fuel ratio as a function of engine coolant temperature. On electronic instrument cluster applications, the ECT output is used to control a coolant temperature indicator. The ECT is used to control torque converter clutch operation.

SYMPTOMS
Torque converter clutch will always be off, resulting in reduced fuel economy.

DIAGNOSTIC TROUBLE CODES
P0116, P0117, P0118