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.
2005 Lexus GX 470FACTORY OEM SERVICE PROCEDURE
Service Data
SERVICE DATA TABLE - ENGINE CONTROL SYSTEM
| Throttle body | ||
| Standard throttle valve opening percentage | 60 % or more | |
| Accelerator pedal position sensor | ||
| Voltage (ACCEL POS) | Accelerator pedal released | 0.5 to 1.1V |
| Accelerator pedal depress | 2.6 to 4.5 V | |
| Voltage (ACCEL POS#2) | Accelerator pedal released | 1.2 to 2.0 V |
| Accelerator pedal depress | 3.4 to 5.3 V | |
| Mass air flow meter | ||
| Resistance | at -20°C (-4°F) | 12.5 to 16.9 kΩ |
| at 20°C (68°F) | 2.19 to 2.67 kΩ | |
| at 60°C (140°F) | 0.50 to 0.68 kΩ | |
| Camshaft timing oil control valve assy | ||
| Resistance | at 20°C (68°F) | 6.9 to 7.9 Ω |
| Throttle w/ motor body | ||
| Resistance | at 20°C (68°F) | 0.3 to 100 Ω |
| Knock control sensor | at 20°C (68°F) | 120 to 280 kΩ |
| Engine coolant temperature sensor | ||
| Resistance | Approx. 20°C (68°F) | 2.32 to 2.59 kΩ |
| Approx. 80°C (176°F) | 0.310 to 0.326 kΩ | |
| Circuit opening relay | ||
| Specified condition | 3 - 5 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω (Apply battery voltage to terminals 1 and 2) | |
| EFI relay | ||
| Specified condition | 3 - 5 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω (Apply battery voltage to terminals 1 and 2) | |
Factory Service Tools
Use the Manual With the Right Hardware
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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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