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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0496: Evaporative Emission (EVAP) System Flow During Non-Purge >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Vehicle and service department temperature and fuel level (vapor pressure) can affect the fuel tank pressure sensor parameter. Ensure the vehicle temperature has stabilized to service department temperature to ensure greatest accuracy.
  • Be sure the EVAP Purge Solenoid Valve command is 0% or this test will not work.
  1. Ignition ON.
  2. Command the EVAP Purge/Seal function to System Seal or Not Venting with a scan tool to seal the EVAP system.
  3. Engine Running.
  4. Verify the Fuel Tank Pressure Sensor parameter is less than 1.9 V for greater than 90 s.
    • If greater than 1.9 V 

      Replace the Q12 Evaporative Emission Purge Solenoid Valve

    • Go to next step: If less than 1.9 V 
  5. All OK
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