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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010-DTC P0459) >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F >> 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.
  1. Ignition/Vehicle Off and all vehicle systems OFF, disconnect the harness connector at the G12 Fuel Pump and at the K111 Fuel Pump Driver Control Module.
  2. Test for less than 2 Ω in the low reference circuit end to end between the following terminals.
    • G12 Fuel Pump terminal 3
    • K111 Fuel Pump Driver Control Module terminal 16
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  3. Connect the harness connector at the K111 Fuel Pump Driver Control Module.
  4. Connect a test lamp between the supply voltage circuit terminal 4 and the low reference circuit terminal 3 of the harness connector at the G12 Fuel Pump.
  5. Ignition On/Vehicle in Service Mode.
  6. Verify the test lamp turns ON and OFF when commanding the fuel pump ON and OFF using the scan tool ECM Fuel Pump Enable control function.
    • If the test lamp is always OFF 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K111 Fuel Pump Driver Control Module.
    2. Test for infinite resistance between the supply voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the supply voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the K111 Fuel Pump Driver Control Module.
    • If the test lamp is always ON 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K111 Fuel Pump Driver Control Module, ignition ON.
    2. Test for less than 1 V between the supply voltage circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the K111 Fuel Pump Driver Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  7. Replace the G12 Fuel Pump.
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