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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010 To P0459) >> Diagnostic Information and Procedures >> DTC P043E, P043F or P145F: Evaporative Emission (EVAP) System Reference Orifice >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
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
    • If all components test normal 

      Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly.

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