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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System - 4.8L, 5.3L & 6.0L (Introduction)) >> Repair Instructions >> Evaporative Emission (EVAP) System Cleaning >> EVAP Cleaning Procedure

EVAP Cleaning Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (1500 Series)  or Evaporative Emission (EVAP) Canister Replacement (1500 Series - 5.3L (L59) Engine)  or Evaporative Emission (EVAP) Canister Replacement (2500 Series) .
  2. Turn OFF the main valve on J 41413-200  . See Special Tools and Equipment .
  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 (EVAP) Canister Replacement (1500 Series)  or Evaporative Emission (EVAP) Canister Replacement (1500 Series - 5.3L (L59) Engine)  or Evaporative Emission (EVAP) Canister Replacement (2500 Series) .
  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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