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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance >> Circuit/System Verification

Circuit/System Verification

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  1. Vehicle in Service Mode
  2. Verify any DTC's are set.
    • If no DTC's are set 
  3. Verify that the Fuel Tank Pressure Sensor voltage parameter is between 1.3 - 1.7 V.
    • If between the 1.3 - 1.7 V 
  4. Engine running at operating temperature for 5 min,
  5. Verify the scan tool Fuel Tank Pressure Sensor parameter does not increase to greater than 2.50 V when commanding the EVAP Purge Solenoid Valve to 50%.
    • If greater than 2.5 V 

      Refer to Circuit/System Testing.

    • If 2.5 V or less 
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  7. All OK.