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.
Circuit Description
The Evaporative Emission (EVAP) system is used to store fuel vapors to reduce amount of unburned fuel from escaping into atmosphere. EVAP purge solenoid is used to control flow of fuel vapors from EVAP canister to intake manifold. EVAP purge solenoid is commanded on whenever EVAP system is in purge mode. Fuel vapors can be purged at anytime PCM is in closed-loop and vehicle is not in decel mode. EVAP purge solenoid circuit is monitored for low and high voltage faults. DTC will set when EVAP purge solenoid is commanded off and feedback voltage at PCM is low.
DTC will set if EVAP purge solenoid voltage is less than 1.25 volts when EVAP purge solenoid is commanded off. Diagnostic runs continuously with ignition on and EVAP purge solenoid commanded off.
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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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