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.
1998 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Throttle Position (TP) Sensor: Es300
- Manufacturer does not list procedure for Throttle Position (TP) sensor adjustment at time of publication. Only information available is for checking resistance of 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 THROTTLE POSITION SENSOR RESISTANCE (ES300) table. Replace components as necessary if resistance is not within specification.
THROTTLE POSITION SENSOR RESISTANCE (ES300) (1)
| Throttle Position | Terminals | Ohmmeter Reading | ||
|---|---|---|---|---|
| Fully Closed | VTA & E2 | 200-6,300 | ||
| Fully Open | VTA & E2 | 2,000-10,200 | ||
| " | VC & E2 | 2,500-5,900 | ||
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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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