Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2004LX 470 V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)TESTING AND INSPECTION
2004 Lexus LX 470 V8-4.7L (2UZ-FE)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
2004 Lexus LX 470 V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE V-BANK COVER
3. REMOVE INTAKE AIR CONNECTOR
4. DISCONNECT THROTTLE BODY FROM INTAKE MANIFOLDS
5. REMOVE ECT SENSOR
a. Disconnect the ECT sensor connector.
b. Remove the ECT sensor and the gasket.
6. INSPECT ECT SENSOR
Using an ohmmeter, measure the resistance between the terminals.
Resistance: Refer to the graph
If the resistance is not as specified, replace the ECT sensor.
7. REINSTALL ECT SENSOR
a. Install a new gasket and the ECT sensor.
Torque: 19.6 N.m (200 kgf.cm, 14 ft.lbf)
b. Connect the ECT sensor connector.
8. REINSTALL THROTTLE BODY TO INTAKE MANIFOLDS
Install a new gasket and the throttle body with the 2 bolts and 2 nuts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
9. REINSTALL INTAKE AIR CONNECTOR
10. REFILL WITH ENGINE COOLANT
11. REINSTALL V-BANK COVER
1. DRAIN ENGINE COOLANT
2. REMOVE V-BANK COVER
3. REMOVE INTAKE AIR CONNECTOR
4. DISCONNECT THROTTLE BODY FROM INTAKE MANIFOLDS
5. REMOVE ECT SENSOR
a. Disconnect the ECT sensor connector.
b. Remove the ECT sensor and the gasket.
6. INSPECT ECT SENSOR
Using an ohmmeter, measure the resistance between the terminals.
Resistance: Refer to the graph
If the resistance is not as specified, replace the ECT sensor.
7. REINSTALL ECT SENSOR
a. Install a new gasket and the ECT sensor.
Torque: 19.6 N.m (200 kgf.cm, 14 ft.lbf)
b. Connect the ECT sensor connector.
8. REINSTALL THROTTLE BODY TO INTAKE MANIFOLDS
Install a new gasket and the throttle body with the 2 bolts and 2 nuts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
9. REINSTALL INTAKE AIR CONNECTOR
10. REFILL WITH ENGINE COOLANT
11. REINSTALL V-BANK COVER
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.