EVAP Canister Vent Valve Inspection
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
- Disconnect the EVAP vent solenoid harness connector.
- Using DMM, measure the solenoid resistance value. See Fig 1 . The resistance should be between 25-30 ohms at 68°F (20°C).
- Replace the solenoid if the resistance is not within specification.
- Using DMM, check for continuity between each solenoid terminal and solenoid housing. See Fig 2 . The DMM should read infinite (OL).
- Replace the EVAP vent solenoid valve if the resistance is not within specification. A shorted valve will cause damage to the PCM.
- Blow air through the upper port of the EVAP vent valve. Air has to flow freely through the lower port. See Fig 3 .
- Replace the valve if the air does not flow through the upper port.
- Apply battery voltage across the solenoid terminals. See Fig 4 .
- Blow air through the upper port of the solenoid. Air should NOT flow through the valve. See Fig 4 .
- Replace the solenoid if the solenoid fails any of the tests.