Acclaim V6-181 3.0L SOHC (1990)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temperature Sensor (Typical)
The coolant temperature sensor is installed in the thermostat housing where it maintains constant contact with the engine coolant. The engine controller
sends out a reference voltage of approximately five (5) volts to the coolant temperature sensor. As coolant temperature changes, the internal resistance
of the sensor will change, causing a voltage drop across the sensor. The engine controller reads the voltage drop across the sensor, and therefore the
engine temperature. The operating range of the coolant temperature sensor is -40°F to 265°F.
Based on the amount of voltage drop at the coolant sensor, the engine controller will:
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Adjust the fuel injector pulse width. A cold engine will receive a longer pulse width, allowing for a richer mixture.
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Monitor and adjust engine warm-up speed.
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Turn ON the engine cooling fan.
