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EVAP Control System Diagnosis (3.1L Lumina)

  1. Perform powertrain diagnostic system check. See appropriate POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
  2. If any DTC is set, perform appropriate DTC test in appropriate SELF-DIAGNOSTICS article. If DTC is not set, go to next step.
  3. Check EVAP system for the following conditions:
    • Loose, incorrect, defective or missing fuel fill cap.
    • Improperly routed, kinked or damaged EVAP system purge or vapor pipes.
    • Pinched off or damaged fresh air vent hose.
    • Damaged EVAP system components.
    • Loose, missing or damaged service port dust cap and/or Schrader valve.

    Repair as necessary. After repairs, go to step  9. If above system checks are okay, go to next step.

  4. Disconnect EVAP vapor pipe from fuel tank or EVAP canister. Turn ignition on, engine off. Using scan tool, observe fuel tank pressure parameter. If fuel tank pressure is about zero, go to next step. If fuel tank pressure is not about zero, see DTC P0453 in appropriate SELF-DIAGNOSTICS article.
  5. Reconnect all EVAP hardware. Install Fuel Tank Cap Adapter (J 41415-40) to fuel fill neck and fuel fill cap. Connect EVAP Pressure/Purge Diagnostic Station (J 41413) to fuel tank cap adaptor. Using scan tool, select SEAL option to seal EVAP system. Using EVAP station, pressurize system to 5 in. H2O (1.25 kPa) by slowly turning rotary switch to PRESSURE position. DO NOT exceed 5 in. H2O (1.25 kPa) pressure. If 5 in. H2O (1.25 kPa) is achieved, go to next step. If 5 in. H2O (1.25 kPa) is not achieved, see DTC P0440 in appropriate SELF-DIAGNOSTICS article.
  6. Using EVAP diagnostic station, maintain fuel tank pressure at 5 in. H2O (1.25 kPa). If scan tool indicates fuel tank pressure of 5 in. H2O (1.25 kPa), go to next step. If fuel tank pressure is not 5 in. H2O (1.25 kPa), see DTC P0452 in appropriate SELF-DIAGNOSTICS article.
  7. Using scan tool, command vent valve off. If pressure decrease is about 0 in. H2O (0 kPa) within 2 minutes with rotary switch in OFF/HOLD position, go to next step. If pressure decrease is not as specified, see DTC P0446 in appropriate SELF-DIAGNOSTICS article.
  8. Using EVAP station, increase fuel tank pressure to 5 in. H2O (1.25 kPa). Using scan tool, observe fuel tank pressure. If scan tool indicates fuel tank pressure decrease to 0 in. H2O (0 kPa) within 15 seconds, see DTC P1441 in appropriate SELF-DIAGNOSTICS article. If fuel tank pressure is not as specified, go to next step.
  9. Reconnect all EVAP hardware. Turn ignition on, engine off. Using scan tool, select SEAL option to seal EVAP system. Do not exceed 15 in H2O pressure. Using EVAP station, pressurize system to 15 in. H2O by slowly turning rotary switch to PRESSURE position. Monitor pressure with gauge on cart with rotary switch in OFF/HOLD position. If EVAP pressure decrease is less than 10 in. H2O within 2 minutes, see DTC P0442 in appropriate SELF-DIAGNOSTICS article. If pressure is as specified, system is okay.
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