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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 › EVAP Cleaning Procedure

EVAP Cleaning Procedure

  1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
  2. Turn OFF the main valve on the J 41413-200  . See Special Tools .
  3. Disconnect the hose from the diagnostic station pressure regulator.
  4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.
  5. Connect the other end of the vacuum hose to the canister side of the purge pipe.
  6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
  7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Refer to Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Engine Compartment EVAP Pipe)  or Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Chassis EVAP Pipe)  or Evaporative Emission (EVAP) System Hoses/Pipes Replacement (EVAP Vent Pipe)  or Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Rear EVAP Fuel Tank Pipe) .
  8. Return the EVAP pressure/purge diagnostic station to the tools original condition.
  9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
  10. Connect all previously disconnected EVAP pipe connectors.
  11. Lower the vehicle.
  12. Continue with the published service manual diagnostic DTC procedure.
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