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.
2000 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Accelerator Pedal Position Sensor
- Disconnect accelerator position sensor connector. Do not confuse accelerator position sensor with throttle position sensor. Both sensors have 4-pin connectors and are mounted on throttle body. Check wire colors to help identify accelerator position sensor connector. See appropriate wiring diagram in WIRING DIAGRAMS article.
- Measure resistance between terminals E2 and VC at accelerator pedal position sensor. See Fig 1. If resistance is not as specified, replace accelerator pedal position sensor. See ACCELERATOR PEDAL POSITION SENSOR RESISTANCE table.
ACCELERATOR PEDAL POSITION SENSOR RESISTANCE
| Application | (1) Ohms | ||
|---|---|---|---|
| GS300 & SC300 | 1200-3200 | ||
| GS400, LS400 & SC400 | 1640-3280 | ||
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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.