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Home >> Cadillac >> 2016 >> ELR >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - Dc P0010 To DTC P0459 >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F (Chassis Control Module): Fuel Pump Control Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the A7 Fuel Pump and Level Sensor Assembly. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K38 Chassis Control Module.
    • If less than 10 Ω 
  3. Connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2.
  4. Vehicle in Service Mode.
  5. 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. Vehicle OFF, disconnect the harness connector at the K38 Chassis Control Module.
    2. Test for infinite resistance between the 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 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K38 Chassis Control Module.
    • If the test lamp is always ON 
    1. Vehicle OFF, disconnect the harness connector at the K38 Chassis Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K38 Chassis Control Module.
    • If the test lamp turns ON and OFF 
  6. Replace the A7 Fuel Pump and Level Sensor Assembly.
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