Toyota 89428-41010 Switch, Temperature Detect

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To start with, the Coolant Temperature Sensor uses a thermistor that adjusts its resistance based on temperature changes. This resistance variation directly affects the voltage signal sent from the sensor to the PCM. Problems with the ECT sensor circuits will trigger a diagnostic trouble code. To check the ECT sensor, detach the electrical connector and measure the resistance between the sensor's terminals using an ohmmeter. The resistance should be between 2,500 and 3,000 ohms at room temperature. When the sensor is warmed in water, the resistance should decrease to around 250 to 300 ohms at 180 degrees F. If the test results are incorrect, you will need to replace the ECT sensor. Then replace the sensor, drain about one gallon of coolant, wrap the threads of the new sensor with Teflon sealing tape, disconnect the electrical connector, and detach the old sensor. After that, the installation is the reverse step of the removal process. Finally, you can refill the cooling system.

Non-toxic coolant is available at local auto parts stores. Although the coolant is non-toxic when fresh, proper disposal of used coolant is still required. First, drain the coolant. Next, disconnect the electrical connector from the sending unit. On four-cylinder models the Engine Coolant Temperature (ECT) sensor also functions as the coolant temperature sending unit - it's located on the left (driver's) end of the cylinder head. The coolant temperature sending unit no. 2 on V6 engines is located in the water outlet at the passenger's side of the engine - use a deep socket to remove it (sensor no. 1 is threaded into the lower tank of the radiator). Using a deep socket or wrench, remove the sending unit. Install the new unit and tighten it securely. Do not use thread sealer as it may electrically insulate the sending unit. Reconnect the electrical connector, refill the cooling system, and check for coolant leakage and proper gauge function.

Make sure the ignition key is in the OFF position.

Do not use thread sealer and ensure proper gauge function and no coolant leakage.

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.

Handle the ECT sensor with care, as damage to this sensor will affect the operation of the entire fuel injection system.

As the sensor temperature decreases, the resistance values increase. Conversely, as the sensor temperature increases, the resistance values decrease.

Yes, proper disposal of used coolant is still required.

If the temperature gauge is inoperative, check the fuses first.

The circuit may be open or the gauge may be faulty.

If the test results are incorrect, the ECT sensor should be replaced.

there is no o-ring associated with this sensor.