LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2009 >> Allure Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449 >> DTC P0442 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

IMPORTANT:
  • Refer to the J 41413-200  operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  • Ensure that the underbody temperature of the vehicle and the tester are similar.
  1. Connect the J 41413-200  to the vehicle at the EVAP service port. 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  . See Special Tools .
  2. Using a scan tool close the EVAP canister vent valve to seal the EVAP system.
  3. Use the flow meter on the J 41413-200  , calibrated to 0.51 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 purge tube until the leak is located using the J 41413-SPT  .
scientia non olet · About LEMON Manuals