acura Workshop Repair Guides

Acura (Honda) Workshop Service and Repair Manuals

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Coolant Temperature Sensor/Switch (For Computer): Description and Operation

Engine Coolant Temperature (ECT) Sensor Location

PURPOSE

The Engine Coolant Temperature (ECT) Sensor measures coolant temperature to supply the Engine Control Module (ECM) with engine
temperature data. 

OPERATION

As coolant temperature increases, sensor resistance decreases. The ECM receives sensor information as resistance to ground. Coolant temperature
information is used to determine proper fuel delivery.

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