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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P129D: Fuel Pump Driver Control Module Ignition 1 Switch Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON.
  2. Verify DTC P0562 is not set.
  3. Ignition OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module, ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp and disconnect all components on the circuit.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Replace the fuse, ignition ON.
    4. Verify the fuse is good after connecting each of the components one at a time.
      • If the fuse opens, replace the component that opens the fuse when connected.
      • If the fuse is good, all OK.
    • If the test lamp illuminates 
  5. Replace the K111 Fuel Pump Driver Control Module.
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