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.
2003 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Testing TP Sensor
- Disconnect electrical connector from TP sensor. Note electrical terminals on TP sensor. See Fig 1. Apply vacuum to throttle opener.
- Using ohmmeter, check resistance between specified terminals in relation to throttle position. See TP SENSOR RESISTANCE (RX300) table. Replace TP sensor as necessary if resistance is not within specification.
TP SENSOR RESISTANCE (RX300) (1)
| Throttle Position | Terminals | Ohms | ||
|---|---|---|---|---|
| Fully Closed | VTA & E2 | 200-6300 | ||
| Fully Open | VTA & E2 | 2000-10,200 | ||
| ..... | VC & E2 | 2500-5900 | ||
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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.
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