L-Series Wagon 2WD F4-1781cc 1.8L SOHC (SPFI) (1987)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Engine Coolant Temperature Sensor
Coolant Temperature Sensor
PURPOSE
The ECU utilizes engine temperature information to calculate the following:
^ Injection quantity
^ Ignition timing
^ Canister purge
^ Idle speed
LOCATION
The sensor is located on the rear of the water cross-over tube on the passengers side.
CONSTRUCTION
The sensor is constructed of a thermistor element in a sealed capsule, with an electrical connector.
Coolant Temperature Sensor Range Chart
OPERATION
The coolant temperature sensor contains a thermistor whose resistance changes with the temperature. The ECU sends a reference voltage to the
sensor and measures changes in resistance as the engine temperature varies.