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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 P1462: Evaporative Emission (EVAP) System Reference Orifice Flow Erratic >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  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

    • 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

    • 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.

    • If the DTC do not set 
  10. All OK.
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