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DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Check for Pending or Confirmed DTCs with the HDS.

    Are DTC U0029 and U0122 indicated at the same time? 

    YES  -Go to TROUBLESHOOTING FOR DTC U0029  .

    NO  -Go to next step.

  3. Clear the DTC with the HDS.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0122 indicated? 

    YES  -Go to next step.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the VSA modulator-control unit and the PCM.

  5. Check for communication to the VSA system with the HDS.

    Does the HDS communicate with the VSA modulator-control unit? 

    YES  -Go to next step.

    NO  -Go to the symptom troubleshooting for an ABS indicator, brake system indicator, and VSA indicator do not go off (see ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF ).

  6. Turn the ignition switch to LOCK (0).
  7. Jump the SCS line with the HDS.
  8. Disconnect the VSA modulator-control unit 36P connector.
  9. Disconnect PCM connector A (49P).
  10. Check for continuity between PCM connector terminal A48 and VSA modulator-control unit 22P connector terminal No. 10.
    Fig 1: Checking Continuity Between PCM And VSA Modulator-Control Unit 22P Connector Terminal Location
    G06423020Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to next step.

    NO  -Repair an open in the wire between the PCM (A48) and the VSA modulator-control unit, then go to step  12.

  11. Check for continuity between PCM connector terminal A49 and VSA modulator-control unit 22P connector terminal No. 15.
    Fig 2: Checking Continuity Between PCM A49 And VSA Modulator-Control Unit 22P Connector Terminal Location
    G06423021Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ), or substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then go to step 12 and recheck. If DTC U0122 is not indicated after substitution, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then go to step 12.

    NO  -Repair an open in the wire between the PCM (A49) and the VSA modulator-control unit, then go to step 12.

  12. Reconnect all connectors.
  13. Turn the ignition switch to ON (II).
  14. Reset the PCM with the HDS.
  15. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  16. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0122 indicated? 

    YES  -Check for poor connections or loose terminals at the VSA modulator-control unit and the PCM, then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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