Toyota 89428-41010 Switch, Temperature Detect

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

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. Installation and Refilling the Cooling System:

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

The engine coolant temperature (ECT) sensor utilizes a thermistor, which is a resistor that adjusts its resistance in response to temperature changes. This variation in resistance directly affects the voltage signal transmitted from the sensor to the PCM. When the sensor temperature decreases, the resistance values increase, and as the temperature rises, the resistance values decrease. Any issues with the ECT sensor circuits will trigger a diagnostic trouble code. To check the ECT sensor, begin by measuring its resistance. Disconnect the electrical connector and use an ohmmeter to measure the resistance between the sensor's terminals. At room temperature (68 degrees F), the resistance should be between 2,500 and 3,000 ohms. Start the engine and monitor the resistance or warm the sensor in a pan of water. At 180 degrees F, the resistance should decrease to approximately 250 to 300 ohms. If the test results are incorrect, it is necessary to replace the ECT sensor. For ECT sensor replacement, ensure the ignition key is in the OFF position and drain around one gallon of coolant from the cooling system. Wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion. Disconnect the electrical connector and carefully unscrew the sensor. Installation involves following the reverse steps of the removal process and refilling the cooling system.

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

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.

Yes, proper disposal of used coolant is still required.

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

there is no o-ring associated with this sensor.