Note. Before performing test, ensure fuel tank is 1/4-3/4 full and vehicle is parked on a level surface.
- Drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See SYSTEM READINESS TEST (SRT) CODES under ADDITIONAL SYSTEM FEATURES in SELF-DIAGNOSTICS - INTRODUCTION article. Stop vehicle and go to next step.
- Select MODE 1 on scan tool and check SRT status of EVAP system. If EVAP system SRT is complete, system is okay at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If EVAP system SRT is incomplete, turn ignition off, wait at least 5 seconds and go to next step.
- Perform driving pattern again. Stop vehicle and select MODE 3 on scan tool. If DTC P0440 or P1447 is set, perform appropriate diagnostic procedure. If DTC P0440 or P1447 is not set, go back to step 2 .