Highlander, MR2, Matrix, Prius, RAV4 & Tacoma
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
On Prius, read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
- Ensure ignition is off. Disconnect electrical connector from Engine Coolant Temperature (ECT) sensor. See ENGINE COOLANT TEMPERATURE SENSOR LOCATION (HIGHLANDER, MR2, MATRIX, PRIUS, RAV4 & TACOMA) table. Remove ECT sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION - 4-CYLINDER article.
- Place probe end of ECT sensor and thermometer in container of water. Attach ohmmeter between electrical terminals on ECT sensor. Heat water and note that resistance is within specification in relation to temperature. See Figure. Replace ECT sensor if resistance is not within specification.ENGINE COOLANT TEMPERATURE SENSOR LOCATION (HIGHLANDER, MR2, MATRIX, PRIUS, RAV4 & TACOMA)
Model Location Highlander On Flywheel End Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With White/Blue & White Wires MR2 On Flywheel End Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With Red/Blue & Brown Wires Matrix On Flywheel End Of Cylinder Head & Contains 2-Pin Electrical Connector With White & Brown Wires Prius On Flywheel End Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With White & Brown Wires RAV4 On Flywheel End Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With White & Brown Wires Tacoma On Coolant Housing At Rear Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With Green/Red & Blue/Black Wires