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.
1997 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Throttle Position (TP) Sensor: Adjustment
- Disconnect TP sensor connector. Loosen TP sensor mounting screws. Apply vacuum to throttle opener to allow throttle to fully seat. Insert specified feeler gauge between throttle stop screw and throttle lever. See TP SENSOR ADJUSTMENT table.
- Connect ohmmeter between terminals IDL (or IDL1) and E2 of TP sensor connector. See Fig 1. Rotate TP sensor counterclockwise until there is no continuity, then rotate it clockwise until there is continuity. Tighten TP sensor mounting screws. Inspect TP sensor again.
TP SENSOR ADJUSTMENT
| Application | Feeler Gauge Thickness |
|---|---|
| SC400 | .016" (.41 mm) |
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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