XJ-6 L6-3.6L (1989)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temperature Sensor
PURPOSE
Informs ECU of engine coolant temperature fluctuations.
OPERATION
The sensor is a temperature sensitive resistor with a negative temperature coefficient. As engine temperature increases, sensor resistance decreases.
Resistance changes are interpreted by the ECU as engine temperature fluctuations. When temperatures are within ECU programmed parameters,
air/fuel ratio will be enriched during cold start and warm-up by increasing injector "ON" time. Sensor voltage signal at the ECU is approximately
2.06V at 86°F (30°C).
The coolant temperature sensor, idle speed control valve and supplementary air valve perform together as the functional equivalent of a carburetor
automatic choke.
LOCATION
Rear of thermostat housing.
