Diagnostic Aids
Use EVAP pressure/purge diagnostic station to pressurize EVAP system to aid in locating intermittent leaks. Move all EVAP components while testing using ultrasonic leak detector. A temporary blockage in EVAP purge solenoid, purge pipe or EVAP canister could cause an intermittent condition.
If problem is intermittent, see INTERMITTENT TROUBLE CODE DETERMINATION under SELF-DIAGNOSTIC SYSTEM.