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Home >> Hummer >> 2005 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Repair Instructions >> Evaporative Emission (EVAP) System Cleaning >> Inspection Procedure
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Inspection Procedure

NOTE: Use the Evaporative Emissions System Tester (EEST) J41413-200 in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source. Damage may result to the EVAP system.
IMPORTANT: Do not perform this procedure unless instructed by an EVAP diagnostic.
  1. Turn OFF the ignition.
  2. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
  3. Lightly tap the EVAP canister purge solenoid valve on a clean hard surface.
  4. Inspect for carbon particles exiting either of the vacuum ports.