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Home >> Chevrolet >> 2016 >> Volt Premier >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P1F59, P1F5A, or P1F5B: 14 Volt Power Module Status Terminal Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Vehicle On
  2. Test for 4.6 V- 7.0 V between the signal circuit terminal 19 X3 and ground.
    • If less than 4.6 V 
    1. Vehicle OFF, disconnect the harness connector at the K1 14V Power 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 K1 14V Power Module.
    • If greater than 7.0 V 
    1. Vehicle OFF, disconnect the harness connector at the K1 14V Power Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit 19 X3 and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K1 14V Power Module..
    • If between 4.6 V - 7.0 V 
  3. Test or replace the K20 Engine Control Module.
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