Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Reviewing the fail records vehicle mileage since diagnostic test last failed may help determine how often condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Use EVAP Pressure/Purge Diagnostic Station (J-41413) in order to pressurize EVAP system to aid in locating intermittent leaks. Move all EVAP components while testing with Ultrasonic Leak Detector (J-41416). A temporary blockage in EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. Repair blockage in EVAP system.