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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010-DTC P0459) >> Diagnostic Information and Procedures >> DTC P043E, P043F, or P145F >> Circuit/System Testing

Circuit/System Testing

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NOTE:

The reference orifice is a small opening at the 2 o'clock position in the pump vacuum opening.

  1. Vehicle OFF, remove the Q63 Evaporative Emission System Leak Detection Pump Assembly.
  2. Inspect the reference orifice within the pump for a restriction/blockage. There should be no restriction.
    • If the reference orifice is restricted 

      Inspect and repair any of the conditions listed below:

    • The EVAP leak detection pump tubes and clamps for damage
    • A missing or damage EVAP leak detection pump O-rings
    • The fresh air tube near the fuel fill pocket for a restriction
    • The fresh air tube for a restriction
    • Go to next step: If all components test normal 

      Go to next step: Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly.

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