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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.6L - DTC P0342 To P0690 >> DTC P0442 >> Circuit/System Verification

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. IMPORTANT: Refer to the J 41413-200  operation manual for detailed instructions. See Special Tools .
  2. Remove the fuel fill cap. Connect the GE-41415-50  to the fuel tank filler neck. See Special Tools . Connect the J 41413-200  to the GE-41415-50  . See Special Tools .
  3. Calibrate the J 41413-200  Flow Meter to the correct leak orifice for the vehicle. See Special Tools .
  4. Lower the EVAP purge canister to gain access to the EVAP vent inlet, and seal it, using a suitable plug or a plug from the J 41413-300  . See Special Tools .
    5. IMPORTANT: Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  5. Activate the J 41413-200  and compare the flow meter's stable floating indicator position to the red flag. See Special Tools . 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 Data List.
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