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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 P145C or P145D: Evaporative Emission (EVAP) System Leak Detection Pump Stuck >> Circuit/System Testing

Circuit/System Testing

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

P145C Pump Stuck Off 

  1. Vehicle in Service Mode.
  2. Verify the scan tool EVAP Leak Detection Pump Pressure parameter.
  3. Command the EVAP Leak Detection Pump ON with a scan tool
  4. The EVAP Leak Detection Pump Pressure should decrease greater than 1.5 kPa (0.21 PSI) from step 2.
    • If not within specified range 

      Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly

    • If within specified range 
  5. All OK

P145D Pump Stuck On 

  1. Vehicle in Service Mode.
  2. Verify the scan tool EVAP Leak Detection Pump Pressure parameter.
  3. Command the EVAP Leak Detection Pump Switching Valve Command to Not Venting position with a scan tool
  4. The EVAP Leak Detection Pump Pressure should not change from step 2 (within 0.2 kPa / 0.029 PSI).
    • If not within specified range 

      Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly

    • If within specified range 
  5. All OK
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