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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Control System & Component Testing - 4-Cylinder) >> Engine Sensors & Switches >> Engine Coolant Temperature Sensor >> Highlander, MR2, Prius, RAV4 & Tacoma

Highlander, MR2, Prius, RAV4 & Tacoma

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tacoma, 2002 Toyota RAV4, 2002 Toyota Prius, 2002 Toyota MR2, and 2002 Toyota Highlander. 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 .
  1. Ensure ignition is off. Disconnect electrical connector from Engine Coolant Temperature (ECT) sensor. See ENGINE COOLANT TEMPERATURE SENSOR LOCATION  table. Remove ECT sensor. See ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
  2. 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

    Model Location
    Camry & Camry Solara On Flywheel End Of Cylinder Head & Contains Dark Gray Electrical Connector With Green/Yellow & Brown Wires
    Celica On Flywheel End Of Cylinder Head & Contains Gray Electrical Connector With Green & Brown Wires
    Corolla On Flywheel End Of Cylinder Head & Contains Dark Gray Electrical Connector With White & Brown Wires
    ECHO On Flywheel End Of Cylinder Head & Contains Gray Electrical Connector With Red/Blue & Brown Wires
    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
    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
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