Toyota 89428-21010 Switch, Temperature Detect

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To troubleshoot the coolant temperature gauge, check the fuses. If the gauge is not working, disconnect the wire at the Coolant Temperature Sensor and observe the gauge's behavior and if the reading drops, replace the sending unit. If the reading remains high, there may be a short in the wire. If the gauge fails to show any indication once the engine warms up, disconnect the wire at the sending unit and use a jumper wire to connect it to clean ground on the engine. Then, if the gauge still doesn't respond, there may be an open circuit. In order to remove the sending unit, drain the coolant, disconnect the wiring connector, and remove the unit using a wrench. Once you are installing the new unit, tighten it securely without using thread sealer. Finally, connect the wiring connector, refill the cooling system, and check for any coolant leakage or issues with the gauge's function.

Approximately one gallon of coolant should be drained from the cooling system.

The ECT sensor is a thermistor that sends a voltage signal to the PCM, which is affected by changes in resistance values as the sensor temperature increases or decreases.

The steps for disposing of used coolant are to drain the coolant and then follow the appropriate disposal methods.

Reconnect the wiring connector, refill the cooling system, and check for coolant leakage and proper gauge function.

Depending on the model, either unscrew the ECT sensor from the water outlet housing or, for 2GR-FKS models, carefully remove the retaining clip and pull out the ECT sensor.

Yes, proper disposal of used coolant is still required.

Wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion.

Wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion.

YES 89428-21010