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.
2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE
Service Data
3MZ-FE ENGINE CONTROL SYSTEM - SERVICE DATA
| Throttle body | Standard throttle valve opening percentage : 60 % or more |
| Mass air flow meter assembly | THA (4) - E2 (5) at -20°C (-4°F): 13.6 to 18.4 kΩ at 20°C (68°F): 2.21 to 2.69 kΩ at 60°C (140°F): 0.49 to 0.67 kΩ |
| Camshaft timing oil control valve assembly | at 20°C (68°F): 6.9 to 7.9 kΩ |
| Throttle body | at 20°C (68°F) M+ (2) - M - (1): 0.3 to 100 kΩ |
| E.F.I., engine coolant temperature sensor | Approx. 20°C (68°F): 2.32 to 2.59 kΩ Approx. 80°C (176°F): 0.310 to 0.326 kΩ |
| Knock sensor | at 20°C (68°F): 120 to 280 Ω |
| A/F relay | 3 - 5 : Blow 1 Ω |
| Circuit opening relay | 3 - 5 : Blow 1 Ω |
Factory Service Tools
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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.
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