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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 501 (Engine Controls/Fuel - Hybrid (LZ1) - Repair Instructions) >> Repair Instructions >> Evaporative Emission System Cleaning >> EVAP Cleaning Procedure

EVAP Cleaning Procedure

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement .
  2. Turn OFF the main valve on the J 41413-200  evaporative emissions system tester (EEST).
  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.
  8. Return the EVAP pressure/purge diagnostic station to the stations original condition.
  9. Install a new EVAP canister. Refer to Evaporative Emission Canister Replacement .
  10. Connect all previously disconnected EVAP pipe connectors.
  11. Lower the vehicle.
  12. Continue with the published service information diagnostic DTC procedure.
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