Engine Coolant Temperature Gauge 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 | |
|---|---|---|
| Land Cruiser | Top Front Of Engine | |
| Sienna | Top Of Engine | |
| RAV4 | Rear Of Cylinder Head, Exhaust Side | |
| Tacoma & 4Runner | ||
| 4-Cyl. | Right Side Of Engine, Under Intake Manifold | |
| V6 | Left Cylinder Head | |
| 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 | |
|---|---|---|
| Land Cruiser, Sienna, RAV4 & Tundra | ||
| 122 (50) | 160-240 | |
| 248 (120) | 17-21 | |
| Tacoma & 4Runner | ||
| 122 (50) | 234-314 | |
| 248 (120) | 24-31 | |