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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P24B9-P24BB >> Circuit/System Verification

Circuit/System Verification

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  1. Vehicle in Service Mode.
  2. Verify the BARO reading against the EVAP Leak Detection Pump Pressure reading with a scan tool. Compare this to the Altitude vs. Barometric Pressure Table referenced here Altitude Versus Barometric Pressure
    • A variance of greater than 3 kPa (0.44 PSI) 

      Indicates a skewed BARO or EVAP leak detection pump sensor. Refer to:DTC P2227-P2230 

    • Go to next step: A variance of less than 3 kPa (0.44 PSI) 
  3. 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.
  4. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If the DTC do not set 
  5. All OK.
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