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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P1462 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
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
    • Go to next step: If not restricted 

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

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