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Home >> Pontiac >> 2009 >> Vibe GT, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 2.4L (Lax) - DTC P0443 To DTC P2A00 >> DTC P0443 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EVAP purge solenoid.
  2. Ignition ON, verify a test lamp illuminates between the ignition 1 voltage circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
  3. Ignition OFF, connect a test lamp between the control circuit terminal 1 and the ignition 1 voltage circuit terminal 2.
  4. Ignition ON, command the EVAP purge solenoid ON and OFF with a scan tool. The test lamp should be pulsing ON and OFF when activated.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the PCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the PCM.
  5. If all circuits test normal, test or replace the EVAP purge solenoid valve.
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