Engine Coolant Temperature (ECT) Sender
- Turn ignition switch to OFF position. Disconnect ECT sender 1-pin connector. See ENGINE COOLANT TEMPERATURE SENDER LOCATION table. Drain cooling system and remove ECT sender. Place probe end of ECT sender and thermometer in a container of water. Connect an ohmmeter between ECT sender terminal and ECT sender body.
- Heat water and note resistance reading. See ENGINE COOLANT TEMPERATURE SENDER RESISTANCE table. If resistance is not as specified, replace ECT sender.
ENGINE COOLANT TEMPERATURE SENDER LOCATION
| Application |
Location |
| Highlander |
| 4-Cyl. |
At Rear Of Cylinder Head |
| V6 |
Top Front Of Engine |
| Land Cruiser |
Top Front Of Engine |
| RAV4 |
Rear Of Cylinder Head, Exhaust Side |
| Sequoia, Tacoma & 4Runner |
| 4-Cyl. |
Right Side Of Engine, Under Intake Manifold |
| V6 |
Left Cylinder Head |
| Sienna |
Top Of Engine |
| Tundra |
| V6 |
In Rear Of Intake Manifold |
| V8 |
In Front Water By-Pass Joint, Next To ECT Sensor |
ENGINE COOLANT TEMPERATURE SENDER RESISTANCE
| Application & Water Temp. °F (°C) |
Ohms |
| Highlander |
|
| Land Cruiser, Sequoia, Sienna, Tacoma & Tundra |
| 122 (50) |
160-240 |
| 248 (120) |
17-21 |
| RAV4 |
|
| 4Runner |
| 122 (50) |
234-314 |
| 248 (120) |
24-31 |