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EVAP Canister Purge 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.
  1. Disconnect the EVAP vent solenoid electrical connector.
  2. Using DMM, measure the solenoid resistance value. The resistance should be 25-30 ohms at 68°F (20°C). See Fig 1 .
  3. Replace the solenoid if the resistance is not within the specification.
  4. Using DMM, check for continuity between each solenoid terminal and solenoid housing. The DMM should read infinite (OL). See Fig 2 .
  5. Replace the EVAP vent solenoid valve if the resistance is not within specification. A shorted valve will cause damage to the PCM.
  6. Blow air through the upper port of the EVAP vent valve. Air has to flow freely through the lower port.
  7. Replace the valve if the air does not flow through the upper port.
  8. Apply battery voltage across the solenoid terminals. See Fig 3 .
  9. Blow air through the upper port of the solenoid. Air should NOT flow through the valve. See Fig 3 .
  10. Replace the solenoid if the solenoid fails any of the tests.
Fig 1: Measuring EVAP Canister Purge Valve Resistance
G00180597Courtesy of GENERAL MOTORS CORP.
Fig 2: Checking EVAP Canister Purge Valve For Internal Short
G00180598Courtesy of GENERAL MOTORS CORP.
Fig 3: Testing EVAP Canister Purge Valve Operation
G00180599Courtesy of GENERAL MOTORS CORP.
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