Engine Coolant Temperature (ECT) Sensor - A/T

DESCRIPTION:
The engine coolant temperature (ECT) sensor detects the temperature of engine coolant and supplies the information to the PCM.
The ECT sensor is threaded into the heater outlet fitting or cooling passage on the engine. For automatic transmission applications, the ECT is used to control TCC solenoid operation. For engine control applications, the ECT signal is used to modify ignition timing, exhaust gas recirculation (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.

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

DIAGNOSTIC TROUBLE CODES:
P0117,P0118,P1116,P1117.