Jeep Wagoneer/Commando/Cherokee 1984-1998

Coolant Temperature Sensor (CTS)



The coolant temperature sensor is located on the left side of the cylinder block, just below the exhaust manifold. The CTS provides an engine coolant temperature input to the ECU, which will then enrich the air/fuel mixture delivered by the injectors when the engine coolant is cold. Based on the CTS signal, the ECU will also control engine warmup idle speed, increase ignition advance and inhibit EGR operation when the coolant is cold.