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.
Test Conditions
PCM Codes E021, E022 and E024 not set. Vehicle in coast down condition. Throttle switch open, brakes applied, throttle angle 16.5 degrees or less and RPM greater than desired.
Under these conditions, PCM commands ISC to retract and extend and monitors TPS for a corresponding decrease and increase in throttle position. If PCM detects a decrease and increase in throttle position twice in succession, code will set and SERVICE ENGINE SOON light will turn on.
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.