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Home >> Chevrolet >> 2007 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P0442 >> Circuit/System Verification
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Circuit/System Verification

  1. Verify the following conditions do not exist in the EVAP system:
    • Loose, incorrect, missing, or damaged fuel fill cap
    • Loose, missing, or damaged service port Schrader valve
    • A damaged EVAP purge solenoid
    • Disconnected, incorrectly routed, kinked, or damaged EVAP pipes and hoses
    • A damaged EVAP vent valve or EVAP canister
    • If you find any of the above conditions, repair as necessary.
  2. Remove the fuel fill cap. Connect the GE-41415-50  to the fuel tank filler neck. Connect the J 41413-200  to the GE-41415-50  .
    IMPORTANT: Refer to the J 41413-200  operation manual for detailed instructions.
  3. Calibrate the J 41413-200  Flow Meter to the correct leak orifice for the vehicle.
  4. Command the EVAP vent solenoid closed with a scan tool.
  5. Activate the J 41413-200  and compare the flow meter's stable floating indicator position to the red flag. The floating indicator should be below the red flag.
    • If the floating indicator is above the red flag, test for a leak in the EVAP system.
  6. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.
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