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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Charging System And Starting System - Hybrid >> Diagnostic Information and Procedures >> DTC P1F59, P1F5A or P1F5B: 14 Volt Power Module Status Terminal Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle OFF, disconnect the X2 harness connector at the K1 14V Power Module and X3 at the K20 Engine Control Module, Vehicle in Service Mode.
  2. Test for less than 1 V between the signal circuit 3 X2 at K1 14V Power Module and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V
  3. Vehicle OFF.
  4. Test for infinite resistance between the signal circuit and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance
  5. Test for less than 2 Ω in the circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the K20 Engine Control Module.
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  7. Verify the DTC does not set.
    • If the DTC sets 

      Test or Replace K1 14V Power Module.

    • If the DTC does not set 
  8. All OK.
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