Vacuum Hoses & Connections Test

Check the following components for leaks to atmosphere and repair or replace as necessary:

• Fuel tank leak.
• A faulty fuel filler cap.
• Fuel fill pipe.
• EVAP 2-way valve malfunction.
• Fuel tank pressure sensor malfunction.

If above components are okay, substitute a known-good PCM and recheck. See SUBSTITUTING PCM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or problem goes away, replace original PCM.