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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0442: Evaporative Emission (EVAP) System Small Leak Detected >> Circuit/System Testing

Circuit/System Testing

NOTE:
  • Refer to the GE41413-A  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 or produce smoke from a leak.
  • Ensure that the underbody temperature of the vehicle and the tester are similar.
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the Q12 Evaporative Emission Canister Purge Solenoid Valve and install the CH48096  .
  2. Connect the GE41413-A  to the CH48096  .
  3. Command the EVAP Purge/Seal function to Not Venting or System Seal with a scan tool to seal the EVAP system.
  4. Use the flow meter on the GE41413-A  calibrated to 0.51 mm (0.020 in) to determine if there is a leak.
    • If a leak is detected 
    1. Use the GE41413-A  to apply smoke to the EVAP system at the purge tube service port until the leak is located using the GE41413-SPT  .
      • If leak is detected, repair or replace the affected component as necessary.
    • If no leak is detected 
  5. All OK.
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