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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 P1F5D or P1F5E: 14 Volt Power Module L-Terminal Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF, disconnect the X1 harness connector at the K1 14V Power Module, Vehicle On
  2. Test for 3.0 - 5.5 V between the signal circuit terminal 1 X2 and ground.
    • If less than 3.0 V 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. 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
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If greater the 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 5.5 V 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit 1 X2 and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If between 3.0 - 5.5 V 
  3. Test or replace the K1 14V Power Module.
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