Checking, removing and installing the coolant temperature sensor [Toyota Corolla E80]

The sensor measures the temperature of the coolant and transmits the corresponding signal to the temperature indicator on the dashboard kit of the front panel ("dashboard"). The sensor contains a sensor element with a negative temperature coefficient, the resistance of which decreases with increasing temperature. If the sensor element fails, the indicator on the front panel gives a false reading.

Checking the temperature sensor

Remove the sensor plug. In doing so, pull not the cable, but the plug itself.

Turn on the ignition with the help of an assistant and monitor the instrument readings.

Short the temperature sensor plug to ground. The indicator on the control panel should show the maximum temperature value.

If the maximum value is not recorded, check the reliability of the connection of the plug to the temperature sensor. Check the electrical wires and connections in the sensor circuit. If the maximum temperature value is recorded, replace the temperature sensor.

Note: To prevent coolant from leaking when removing the sensor, first drain some of the coolant into a container.

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Screw in the sensor without tightening it too much. Insert the plug.

Fill with coolant and bleed air from the system.

Conduct a test drive and check the tightness of the sensor connection.