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Home >> GMC >> 2004 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.3L (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 (Pickup)  or Evaporative Emission (EVAP) Canister Replacement (2-Door Utility) .
  2. Turn OFF the main valve on the J 41413 .
  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) Hoses/Pipes Replacement - Chassis/Canister  or Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis .
  8. Return the J 41413 .
  9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (Pickup)  or Evaporative Emission (EVAP) Canister Replacement (2-Door Utility) .
  10. Lower the vehicle.
  11. Continue with the published service manual diagnostic trouble code (DTC) procedure.
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