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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0385 To DTC P2119 >> DTC P0442 >> Circuit/System Testing
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Circuit/System Testing

    IMPORTANT:
    • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
    • Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. The system flow will be less with higher temperatures.
    • Refer to J 41413-200  operation manual for detailed instructions. See Special Tools .
  1. Connect the J 41413-200  to the vehicle at the EVAP service port. See Special Tools . For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  .
  2. Using a scan tool, close the EVAP canister vent valve.
  3. Seal the system and use the flow meter on the J 41413-200  , calibrated to 0. See Special Tools .51 mm (0.020 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the J 41413-200  to apply smoke to the EVAP system at the service port or the filler neck until the leak is located. See Special Tools . For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  .
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