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 ES 300FACTORY OEM SERVICE PROCEDURE
Intake Air Control System (ES300)
- Using 3-way connector, connect vacuum gauge to actuator hose. See Fig 1. Connect hand-held tester to DLC3. See Figure. Start engine. Select ACTIVE TEST mode according to message on hand-held tester. With VSV on, vacuum should be about 7.9 in. Hg (27 kPa). With VSV off, no vacuum should be present.
- Shift transmission into Park and operate accelerator pedal. Check data monitor operation. See Fig 2. Valve shown in illustration is for reference only, throttle valve may operate differently depending on running condition. If operation is not to specification, check intake air control valve assemblies.
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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