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EVAP System Cleaning

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NOTE: Use the EVAP Pressure/Purge Diagnostic Station (J 41413) in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source. Damage may result to the EVAP system. Do not perform this procedure unless instructed by an evaporative emission diagnostic.
  1. Turn ignition OFF. Remove the EVAP canister purge valve. See EVAP CANISTER PURGE VALVE REMOVAL & INSTALLATION . Lightly tap the EVAP canister purge valve on a clean hard surface. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles are found, reinstall the EVAP canister purge valve and go to next step. If carbon particles are found during the inspection procedure, go to next step. If you were instructed to replace the EVAP canister purge valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not go to next step.
  2. Remove the EVAP canister. See EVAP CANISTER REMOVAL & INSTALLATION (PASSENGER/CARGO VAN)  or EVAP CANISTER REMOVAL & INSTALLATION CUTAWAY VAN  . Turn OFF the main valve on the diagnostic station. Disconnect the hose from the diagnostic station pressure regulator. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator. Connect the other end of the vacuum hose to the canister side of the purge pipe. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds. If the nitrogen does not dislodge the carbon particles, replace the EVAP purge pipe.
  3. Return the EVAP pressure/purge diagnostic station to its original condition. Install a NEW EVAP canister. Install a NEW EVAP canister purge valve. Lower the vehicle. Continue with the diagnostic DTC procedure.
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