Engine Coolant Temperature (ECT) Sensor
- Ensure ignition is off. Disconnect electrical connector from ECT sensor. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION table. To verify wire colors for proper sensor identification, see appropriate wiring diagram in WIRING DIAGRAMS
article.NOTE: The ECT sensor may be also identified using appropriate illustration in THEORY/OPERATION article.
- Drain cooling system and 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.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION
| Model | Location |
|---|---|
| Avalon | On Coolant Housing In Front Of Intake Manifold, At Timing Belt End Of Engine & Contains Dark Gray 2-Pin Electrical Connector |