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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 P0496: Evaporative Emission (EVAP) System >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, engine OFF.
  2. Seal the EVAP system using the Purge/Seal function with a scan tool.
  3. Start the engine.
  4. Observe the FTP sensor with a scan tool. The FTP sensor parameter should be less than 1.7V after 90s.
    • If not within specifications 

      Replace the Q12 Evaporative Emission Purge Solenoid Valve

    • If within Specifications 
  5. All OK
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