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Home >> Chevrolet >> 2017 >> City Express LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L >> Diagnostic Information And Procedures >> DTC P0447 or P0448 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EVAP Vent Solenoid Valve.
  2. Ignition ON, test for B+ between the EVAP Vent Solenoid Valve circuit terminal 1 and ground.
    • If less than B+, test the EVAP Vent Solenoid Valve ignition voltage circuit for a short to ground or an open/high resistance.
    • If B+ is found
  3. Connect a test lamp between the control circuit terminal 2 and the EVAP Vent Solenoid Valve circuit terminal 1 voltage circuit.
  4. Command the EVAP vent solenoid valve ON with a scan tool. The test lamp should turn ON.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K 20 Engine Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K 20 Engine Control Module.
    • If all circuits test normal
  5. Test or replace the EVAP Vent Solenoid Valve.
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