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.
Throttle Valve Control Module
Idle speed is controlled by Throttle Valve Control Module (TVCM). TVCM is not adjustable. If vehicle exhibits idle speed problems, check for vacuum leaks. If no vacuum leaks are present, check fuel pressure, dashpot adjustment and ERG valve (if equipped). Also, perform testing under any TVCM related DTCs in appropriate SELF-DIAGNOSTIC article.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.