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.
Chart C3 - Canister Purge Valve Check
Canister purge is controlled by a solenoid that allows manifold vacuum to purge canister when de-energized. The ECM supplies a ground to energize solenoid (purge off). If diagnostic test terminal is grounded with engine stopped or the following conditions are met with engine running, purge solenoid is energized (purge on).
- Engine has been operating for more than 65 seconds.
- Coolant temperature greater than 133°F (56°C).
- Checks to see if solenoid is opened or closed. The solenoid is normally de-energized in this test and should be open.
- This test checks for a complete circuit. Normally ignition voltage is present at circuit No. 439. ECM provides ground on circuit No. 428.
- Functional test is completed by grounding test terminal. Normally this should energize solenoid, opening valve and allowing vacuum to drop (purge on).
NO RELATED
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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.