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 ES 300FACTORY OEM SERVICE PROCEDURE
Throttle Position (TP) Sensor
- Turn ignition off. Ensure throttle linkage moves smoothly. Ensure throttle lever is adjusted properly. See THROTTLE BODY LEVER ADJUSTMENT in ON-VEHICLE ADJUSTMENTS article. Disconnect electrical connector from Throttle Position (TP) sensor on throttle body. Disconnect vacuum hose from throttle body. See Fig 1. Connect a vacuum pump to disconnected vacuum hose and apply vacuum.
- Using ohmmeter, check resistance between specified terminals in relation to throttle position. With throttle fully closed, resistance between terminals VTA and E2 should be 200-6300 ohms. See Fig 1. With throttle fully open, resistance between terminals VAT and E2 should be 2000-10,200 ohms. Resistance between terminals VC and E2 should be 2500-5900 ohms. If resistance is not as specified, replace TP sensor.
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.