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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333 >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F: Fuel Pump Control Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module and the G12 Fuel Pump inline harness connector X350.
  2. Test for less than 2Ω in the low reference circuit end to end between the following terminals:
    • X350 terminal
    • K111 Fuel Pump Driver Control Module terminal 16
    • If 2Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2Ω 
  3. Connect the harness connector at the K111 Fuel Pump Driver Control Module.
  4. Ignition ON, connect a test lamp between the fuel pump control circuit terminalA and the low reference circuit terminal S on the body side of connector X350.
  5. Verify the test lamp turns ON and OFF when commanding the Fuel Pump Enable On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module.
    2. Test for infinite resistance between the fuel pump control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the fuel pump control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the K111 Fuel Pump Driver Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K111 Fuel Pump Driver Control Module, ignition ON.
    2. Test for less than 1V between the fuel pump control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, test or replace the K111 Fuel Pump Driver Control Module.
    • If the test lamp turns ON and OFF 
  6. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module and at the G16 Fuel Pump. It may take up to 2 minutes for all vehicle systems to power down.
  7. Test for infinite resistance between the low reference circuit and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  8. Test for less than 2Ω in the low reference circuit end to end.
    • If 2Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2Ω 
  9. Test for infinite resistance between the fuel pump control circuit and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  10. Test for less than 2Ω in the fuel pump control circuit end to end.
    • If 2Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2Ω 
  11. Replace the G12 Fuel Pump.
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