Evaporative Emission (EVAP) Canister Vent Valve Inspection

1. Remove the EVAP canister vent valve. Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement.




2. Using a DMM, measure the resistance of the EVAP canister vent valve between both terminals. The resistance should be 25-30 ohms at 20°C (68°F).
3. Replace the EVAP canister vent valve if the resistance is not 25-30 ohms at 20°C (68°F). If the resistance is within specification, proceed to Step 4.




4. Blow air into the vent valve port that was connected to the EVAP canister air filter. Air should pass through the EVAP canister vent valve.




5. Connect 12 volts DC to the terminals of the EVAP canister vent valve.
6. Blow air into the vent valve port that was connected to the EVAP canister air filter. Air should not pass through the vent valve and exit from the other end.
7. Replace the EVAP canister vent valve if the vent valve failed this inspection.
8. Install the EVAP canister vent valve. Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement.