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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC P0449, P0498 or P0499 is not set.
    • Go to next step: If the DTC is not set 
  3. Ignition OFF, remove the fuel tank filler cap. Ignition ON.
  4. Verify the scan tool Fuel Tank Pressure Sensor voltage parameter is between 1.3 - 1.7 V.
    • If not between the 1.3 - 1.7 V 

      Refer to P0452, P0453 within DTC P0451-P0454 .

    • Go to next step: If between the 1.3 - 1.7 V 
  5. Install the fuel tank filler cap. Engine idling at operating temperature for 5 min,
  6. Verify the scan tool Fuel Tank Pressure Sensor parameter does not increase to greater than 2.5 V when commanding the EVAP Purge Solenoid Valve to 50%.
    • If greater than 2.5 V 

      Refer to Circuit System Testing below.

    • Go to next step: If 2.5 V or less 
  7. 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 below.

    • Go to next step: If the DTC does not set 
  8. All OK.
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