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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P1400 Through DTC P2635 >> DTC P145C or P145D >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q63 evaporative emission system leak detection pump assembly.
  2. Verify that a test lamp illuminates between the voltage supply circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the Q63 evaporative emission system leak detection pump assembly.
  3. Connect a test lamp between the voltage supply circuit terminal 3 and the control circuit terminal 4.
  4. Command the EVAP leak detection pump ON and OFF with a scan tool. The test lamp should respond to the command.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 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 K20 engine control module.
  5. If all circuits test normal, replace the Q63 evaporative emission system leak detection pump assembly.
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