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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (12 V Starting And Charging - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P3052, P3054, or P3056 >> Circuit/System Testing - T19 Multifunction Power Supply Converter Input/Output Circuit Test

Circuit/System Testing - T19 Multifunction Power Supply Converter Input/Output Circuit Test

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

    NOTE:

    Do not replace the T19 Power Supply control module if you cannot reproduce the codes during a drive cycle.

  1. Ignition Off, disconnect the connector at the T19 Multifunction Power Supply Converter.
  2. Verify a test lamp illuminates between ground circuit terminal 7 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 2550 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Verify a test lamp illuminates between ground circuit terminal 12 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 2550 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  4. Verify a test lamp illuminates between B+ circuit terminal 8 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test circuit 6240 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. 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. Test circuit 6240 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 2173 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    3. Replace the T19 Multifunction Power Supply Converter.
    • Go to next step: If the test lamp illuminates 
  5. Ignition On vehicle in Service mode.
  6. Verify a test lamp does not turn on between control circuit terminal 9 and ground.
    • If the test lamp turns on 

      Repair the short to voltage on circuit 2173.

    • Go to next step: if the test lamp does not turn on 
  7. Ignition OFF.
  8. Test for infinite resistance between control circuit terminal 9 and ground.
    • If less than infinite resistance 

      Repair the short to ground on circuit 2173.

    • Go to next step: If infinite resistance 
  9. Connect all connectors.
  10. Clear all DTCs.
  11. Road test the vehicle allowing a minimum of 5 engine auto stop/start events to occur.
  12. Verify DTC P3052, P3054, or P3054 does not reset.
    • If any of the DTCs reset 
    1. Verify the Ignition circuit 439 at the K20 Engine Control Module is within 1 V of control circuit 2173 at the T19 Multifunction Power Supply Converter.
      • if not within the specified value 

        Repair the open/high resistance in circuit 439.

      • Go to next step: If within the specified value 
    2. Replace the T19 Multifunction Power Supply Converter.
    • Go to next step: If any of the DTC did not reset 
  13. A fault is not currently present and may be an intermittent condition.
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