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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 321 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P3052, P3054, or P3056: DC/DC Converter Actuator >> Circuit/System Testing

Circuit/System Testing

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NOTE:

You must perform Circuit/System Verification before Circuit/System Testing.

  1. Ign Off and all vehicle systems OFF, disconnect harness connector at T19 Power Supply Transformer. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 ohms between each circuit ground terminal at the T19 Power Supply Transformer listed below and ground:
    • Terminal 7
    • Terminal 12
  3. Disconnect harness connector at the K20 Engine Control Module.
  4. Test for less than 5 Ω between each ground circuit terminal and ground.
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  5. Verify a test lamp illuminates between each of the B+ circuits at the T19 Power Supply Transformer listed below and ground:
    • Terminal 8
    • Terminal 11
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp, remove appropriate fuses.
    2. Test for infinite resistance between the B+ circuit and ground.
      • less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the T19 Power Supply Transformer.
    • If the test lamp illuminates 
  6. Ignition ON.
  7. Verify a test lamp illuminates between each of the Ign circuits at the T19 Power Supply Transformer listed below and ground:
    • Terminal 4
    • Terminal 6
    • 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 OK 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.
    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, replace the T19 Power Supply Transformer.
    • If the test lamp illuminates 
  8. Ignition Off. Reconnect T19 Power Supply Transformer.
  9. Clear codes and operate vehicle in conditions for an autostop.
  10. Verify DTC P3052, P3054, or P3056 does not set.
    • If any of the DTCs are set 

      If DTC sets, replace T19 Power Supply Transformer.

    • If none of the DTCs are set 
  11. All OK
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