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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 948 (Engine Controls - 8.1L (Introduction)) >> Repair Instructions >> Evaporative Emission (EVAP) System Cleaning >> EVAP Cleaning Procedure

EVAP Cleaning Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (Pickup)  or Evaporative Emission (EVAP) Canister Replacement (Cab/Chassis) .
  2. Turn OFF the main valve on the J 41413-200  .
  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 J 41413-200  to its original condition.
  9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (Pickup)  or Evaporative Emission (EVAP) Canister Replacement (Cab/Chassis) .
  10. Install the EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
  11. Lower the vehicle.
  12. Continue with the published service manual diagnostic DTC procedure.
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