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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0496 or P146C >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P0451-P0454 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Engine - Idling
  4. Perform the scan tool control function: EVAP Purge/Seal - Not Venting
  5. Verify the scan tool parameter: Fuel Tank Pressure Sensor = Less than 9.3 mmHg (5.0 in. H2O) - After 60 s
    • If 9.3 mmHg (5.0 in. H2O) or greater 

      Refer to: Circuit/System Testing

    • Go to next step: If less than 9.3 mmHg (5.0 in. H2O) 
  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.

    Verify the DTC does not set.

    • If the DTC sets 

      Repeat the procedure starting at step 2

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