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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> IMA System >> DTC Troubleshooting >> DTC U1220: DC-DC Converter Lost Communication with Motor Control Module (MCM)

DTC U1220: DC-DC Converter Lost Communication with Motor Control Module (MCM)

NOTE:
  • Before you troubleshoot, record all freeze data, and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  • If the DTC cannot be cleared, do the troubleshooting for DTC U1204.
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS (see DTC CLEAR  ).
  3. Start the engine.
  4. Monitor the OBD STATUS for U1220 in the DTCs MENU with the HDS.

    Does the HDS indicate FAILED? 

    YES  -Go to step  5.

    NO  -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter and the MCM. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

  5. Turn the ignition switch to LOCK (0).
  6. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  7. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  8. Remove the MCM (see IPU CASE REMOVAL/INSTALLATION  ).
  9. Disconnect the DC-DC converter 4P connector (A).
    Fig 1: Identifying DC-DC Converter 4P Connector Components Location
    G06950492Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between MCM connector terminal A27 and body ground.
    Fig 2: Checking Continuity Between MCM Connector Terminal A27 And Body Ground
    G06950493Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the MCM (A27) and the DC-DC converter, then go to step  22.

    NO  -Go to step  11.

  11. Reconnect the DC-DC converter 4P connector.
  12. Turn the ignition switch to ON (II).
  13. Measure the voltage between MCM connector terminal A27 and body ground.
    Fig 3: Measuring Voltage Between MCM Connector Terminal A27 And Body Ground
    G06950494Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 8-12 V? 

    YES  -Go to step  29.

    NO  -Go to step  14.

  14. Measure the voltage between DC-DC converter 4P connector terminal No. 3 and body ground.
    Fig 4: Measuring Voltage Between DC-DC Converter 4P Connector Terminal No. 3 And Body Ground
    G06950495Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 8-12 V? 

    YES  -Repair an open in the wire between the MCM (A27) and the DC-DC converter, then go to step  22.

    NO  -Go to step  15.

  15. Substitute a known-good DC-DC converter (see DC-DC CONVERTER REMOVAL/INSTALLATION  ).
  16. Reconnect all connectors.
  17. Reinstall the MCM (see IPU CASE REMOVAL/INSTALLATION  ).
  18. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  19. Turn the ignition switch to ON (II).
  20. Clear the DTC with the HDS (see DTC CLEAR  ).
  21. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U1220 indicated? 

    YES  -Go to step  32.

    NO  -Replace the original DC-DC converter (see DC-DC CONVERTER REMOVAL/INSTALLATION  ), then go to step  22.

  22. Reconnect all connectors.
  23. Reinstall the MCM (see IPU CASE REMOVAL/INSTALLATION  ).
  24. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  25. Turn the ignition switch to ON (II).
  26. Clear the DTC with the HDS (see DTC CLEAR  ).
  27. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U1220 indicated? 

    YES  -Check for poor connections or loose terminals at the DC-DC converter and the MCM, then go to step  1.

    NO  -Go to step  28.

  28. Monitor the OBD STATUS for U1220 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  27, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the DC-DC converter and the MCM, then go to step  1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

  29. Reconnect all connectors.
  30. Reinstall the MCM (see IPU CASE REMOVAL/INSTALLATION  ).
  31. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  32. Update the MCM if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE  ), or substitute a known-good MCM (see SUBSTITUTING THE MCM  ).
  33. Turn the ignition switch to ON (II).
  34. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U1220 indicated? 

    YES  -Check for poor connections or loose terminals at the DC-DC converter and the MCM. If the MCM was updated, substitute a known-good MCM (see SUBSTITUTING THE MCM  ), then recheck. If the MCM was substituted, go to step  1.

    NO  -Go to step  35.

  35. Monitor the OBD STATUS for U1220 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM (see IPU CASE REMOVAL/INSTALLATION  ). If any other Pending or Confirmed DTCs were indicated in step  34, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the DC-DC converter and the MCM. If the MCM was updated, substitute a known-good MCM (see SUBSTITUTING THE MCM  ), then recheck. If the MCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

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