EVAP Pressure Switching Solenoid 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.
- Remove the EVAP pressure switching solenoid.
- Using DMM, measure the resistance of the EVAP pressure switching solenoid. See Fig 1 . The EVAP pressure switching solenoid resistance should be 37-44 ohms at 68°F (20°C).
- Replace the EVAP pressure switching solenoid if the resistance is not as specified. The solenoid will damage the PCM, if the resistance value is less than 27 ohms.
- Check for continuity on each terminal to the valve body. See Fig 2 .
- Replace the EVAP pressure switching solenoid if continuity is present.
- Blow air into the inboard port. The air should NOT flow through the valve and out of the outboard port.
- Apply battery voltage across the terminals of the EVAP pressure switching solenoid. See Fig 3 .
- Blow air into the inboard port and air should flow through the valve and out of the outboard port. See Fig 3 .
- Replace the EVAP pressure switching solenoid if the solenoid failed either test.