Toyota 89422-35010 Sensor, Water Temperature

The Engine Coolant Temperature (ECT) sensor is a thermistor that changes its resistance based on temperature variations, affecting the voltage signal sent to the PCM; as the sensor temperature decreases, resistance increases, and as the temperature increases, resistance decreases, with any issues in the ECT sensor circuits triggering a diagnostic trouble code. Begin by ensuring the ignition key is in the OFF position, then drain approximately one gallon of coolant from the cooling system. Next, disconnect the electrical connector and carefully unscrew the sensor. When installing the new sensor, wrap its threads with Teflon sealing tape to prevent leakage and corrosion, and remember that installation follows the reverse order of removal, taking care to handle the ECT sensor delicately, as damage to it can impact the entire fuel injection system.

If the coolant temperature gauge isn't working, check the fuses. If it shows excessive temperature, consult the manual. If it reads HOT on a cold start, disconnect the sender wire. If the gauge drops, replace the unit. If it stays high, the wire or gauge could be faulty. If the gauge doesn't indicate after warming up, disconnect the wire at the unit and connect it to a clean engine ground. Also, reconnect the connector, refill the cooling, and check for leaks.

The Coolant Temperature Sensor has two purposes for your vehicle, it delivers important information to the Powertrain Control Module for engine management and provides information to the temperature gauge on the vehicle's instrument panel. It also detects the engine's coolant temperature and allows for great performance and accurate readings for the driver.

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.

Be careful with the ECT sensor in four-cylinder models as it affects the fuel injection system. It's on the left end of the cylinder head. Disconnect the negative battery cable, partially drain the cooling system, disconnect the sensor's electrical connector, and unscrew it. Apply Teflon tape to the threads and ensure secure tightening during installation. In V6 models, the ECT sensor is on the water outlet casting on 3.0L and 3.3L engines, and under the air filter housing on 3.5L engines. Disconnect the negative battery cable, partially drain the cooling system, and disconnect the sensor's electrical connector. Depending on the model, unscrew the sensor or remove the retaining clip and pull out the sensor. Ensure proper tightening or full seating before reinserting the clip. Refill the cooling system to finish.

The Coolant Temperature Sensor serves two purposes to the vehicle it is equipped to, it delivers important information to the Powertrain Control Module for engine management and also provides data to the temperature gauge that is found on the vehicle's instrument panel. It also detects the engine's coolant temperature and allows for outstanding performance and precise readings for the driver's awareness.

Non-toxic coolant is sold at auto parts stores and requires proper disposal. This applies to 2006 and earlier models. For 2007 and later models, the engine coolant temperature sensor operates the temperature gauge. If the gauge is inoperative, check fuses first. If it shows excessive temperature, refer to Troubleshooting. If it indicates "Hot" on a cold start, disconnect the wire at the coolant temperature sender. If the gauge reading drops, replace the sending unit. If it remains high, the wire or gauge may be faulty. If the gauge doesn't respond after warming up the engine and checking fuses, the circuit or gauge may be faulty. To replace, drain the coolant, disconnect the wiring connector, remove the sending unit, install the new one, and refill the cooling system. Check for leaks and gauge function.

If the coolant temperature gauge isn't working, check the fuses. If it shows excessive temperature, consult the manual. If it reads HOT on a cold start, disconnect the sender wire. If the gauge drops, replace the unit. If it stays high, the wire or gauge could be faulty. If the gauge doesn't indicate after warming up, disconnect the wire at the unit and connect it to a clean engine ground. Also, reconnect the connector, refill the cooling, and check for leaks.

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.

Start by checking the fuses.

Make sure the ignition key is in the OFF position.

The Troubleshooting section in the front of the manual should be checked.

Any issue in the ECT sensor circuit will set a diagnostic trouble code.

The Engine Coolant Temperature (ECT) sensor is a component that monitors the temperature of the engine coolant and relays the information to the Powertrain Control Module (PCM) for engine management and to the temperature gauge on the instrument panel.

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

Yes it is

plug is part of wiring and harness for the engine.

This part is made in Japan

The second part number on the item is the OEM part number

This sensor is for the ECU of the vehicle

Yes, this is a genuine Toyota part

Yes, this is a genuine Toyota part

No, this does not include an o-ring but can be found under part number 90130-12005

This is the part your looking for for your vin 89422-35010. thank you