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ENGINE COOLANT TEMPERATURE SENSOR OPERATION The engine coolant temperature sensor provides an input to the powertrain control module (PCM). As coolant tem- When the engine is cold, the PCM will demand slightly richer air-fuel mixtures and higher idle speeds until normal The engine coolant sensor input also determines operation of the radiator fan. REMOVAL REMOVAL 1. Disconnect the negative battery cable. 2. Partially drain the cooling system. (Refer to 7 - COOLING/ENGINE/COOLANT - STANDARD PRO- 3. Remove the engine cover (1). Grasp both corners of the engine cover, and pull up firmly. 4. Disconnect the engine coolant temperature sensor harness connector (1). ZH ENGINE 7 - 39 |