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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 P1462 >> Circuit/System Verification

Circuit/System Verification

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  1. Vehicle in Service Mode.
  2. Verify the scan tool EVAP Leak Detection Pump Pressure sensor reading is within the range specified in the Altitude Versus Barometric Pressure table.
  3. Record the EVAP Leak Detection Pump Pressure sensor reading.
  4. Command the scan tool EVAP Leak Detection Pump ON.
  5. Record the EVAP Leak Detection Pump Pressure sensor reading after 6 min. The reading should be 1.18 - 4 kPa (0.17-0.58 PSI) less than the initial reading from step 2.
    • If not within the specified range 

      Refer to Circuit/System Testing

    • Go to next step: If within specified range 
  6. Record the EVAP Leak Detection Pump Pressure sensor reading after monitoring for an additional 5-10 min.
  7. The reading should be 1.18 - 4.5 kPa (0.17-0.58 PSI) less than the initial reading from step 2, and the difference between the step 4 and step 5 readings less than 0.51 kpa (.07 PSI)
    • If not within the specified range 

      Refer to Circuit/System Testing

    • Go to next step: If within specified range 
  8. 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.
  9. 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 
  10. All OK.
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