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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 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. Verify the reference orifice within the pump does not have a restriction.
    • If restricted 

      Inspect and repair any of the conditions listed below:

    • The EVAP leak detection pump to the vent solenoid tube 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 not restricted 

      Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly.

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