Canister Purge Valve Inspection

1. Remove the CPV and blow through it in both directions. Without it being energized, the valve should not allow air to pass through it. Replace the valve if necessary.

2. Check for an intermittent condition. Cycle the CPV several times using the test lead by connecting it to a 12 volt battery source. Disconnect the power source and blow through it again in both directions. Without it being energized, the valve should not allow air to pass through it. Replace the valve if necessary.





3. "Tee" in a vacuum gauge on the "canister" side of the CPV. With a good valve, vacuum is "0" when the CPV is not cycling. The gauge will pulse when it starts to cycle. Touch your hand on the CPV to verify when it stops cycling; the gauge should read "0" vacuum when the valve is not cycling. If the gauge reads any amount of vacuum when it is not cycling, the valve is stuck open and needs replacing.