Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
- ECT sensor is located on passenger's side of coolant pipe at front of engine, in front of intake manifold and contains a Green 2-pin connector with Green/Black and Brown/White wires. Manufacturer recommends removing throttle body for access to ECT sensor. See THROTTLE BODY under FUEL SYSTEM in REMOVAL & INSTALLATION - EXCEPT GX470 article. Remove ECT sensor.
- 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 Fig 1. Replace ECT sensor if resistance is not within specification.
- Using NEW gasket, install ECT sensor. Tighten ECT sensor to 15 ft. lbs. (20 N.m). Install throttle body. Fill cooling system.