Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 60 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)EMISSION SYSTEMS & SUBSYSTEMSEVAPORATIVE EMISSION CONTROL SYSTEM DIAGNOSISEVAP PRESSURE SWITCHING SOLENOID INSPECTION
2001 Chevrolet Cavalier LS, 2.4 T
EVAP Pressure Switching Solenoid Inspection
2001 Chevrolet Cavalier LS, 2.4 TSECTION 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.