Coolant Temperature Sensor (CTS)

CTS is located in the cooling system water passage in right rear corner of engine compartment. The CTS provides information to ECM which is used for fuel enrichment, ignition timing, EGR operation, canister purge control, air management, early fuel evaporation control, idle speed control and closed loop fuel control. Like the MAT sensor, it is a thermistor that changes value based on temperature. Low temperature produces high resistance values, high temperature produces low resistance values.