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

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. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0122 indicated? 

    YES  -Go to step 4.

    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 ECM/PCM.

  4. Check for a DTC in the DTCs MENU with the HDS.

    Is VSA DTC 86 indicated? 

    YES  -Go to step 5.

    NO  -Go to step  13.

  5. Turn the ignition switch to LOCK (0).
  6. Jump the SCS line with the HDS.
  7. Disconnect the VSA modulator-control unit 47P connector (see REMOVAL ).
  8. Disconnect ECM/PCM connector E (31P).
  9. Connect VSA modulator-control unit 47P connector terminal No. 11 to body ground with a jumper wire.
    Fig 1: Connecting VSA Modulator-Control Unit 47P Connector Terminal No. 11 To Body Ground With Jumper Wire
    G06267448Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between ECM/PCM connector terminal El 1 and body ground.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminal El 1 And Body Ground
    G06267449Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 11.

    NO  -Repair open in the wire between the ECM/PCM (E11) and the VSA modulator-control unit (No. 11), then go to step  20.

  11. Connect VSA modulator-control unit 47P connector terminal No. 15 to body ground with a jumper wire.
    Fig 3: Connecting VSA Modulator-Control Unit 47P Connector Terminal No. 15 To Body Ground With Jumper Wire
    G06267450Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check for continuity between ECM/PCM connector terminal E24 and body ground.
    Fig 4: Checking Continuity Between ECM/PCM Connector Terminal E24 And Body Ground
    G06267451Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good VSA modulator-control unit, then go to step  20 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit, then go to step  20.

    NO  -Repair open in the wire between the ECM/PCM (E24) and the VSA modulator-control unit (No. 15), then go to step  20.

  13. Turn the ignition switch to LOCK (0).
  14. Check for poor connections or loose terminals at the VSA modulator-control unit 47P connector.

    Are the connections and terminals OK? 

    YES  -Go to step 15.

    NO  -Repair the connections or terminals, then go to step  20.

  15. Disconnect the VSA modulator-control unit 47P connector.
  16. Turn the ignition switch to ON (II).
  17. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 4 and body ground.
    Fig 5: Measuring Voltage Between VSA Modulator-Control Unit 47P Connector Terminal No. 4 And Body Ground
    G06267452Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 18.

    NO  -Check the No. 4 ACG (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 4 ACG (10 A) fuse and the VSA modulator-control unit, then go to step  20.

  18. Turn the ignition switch to LOCK (0).
  19. Check for continuity between VSA modulator-control unit 47P connector terminal No. 16 and body ground.
    Fig 6: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 16 And Body Ground
    G06267453Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then go to step 20 and recheck. If U0122 is not indicated, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then go to step 20.

    NO  -Repair open in the wire between the VSA modulator-control unit and G202, then go to step 20.

  20. Reconnect all connectors.
  21. Turn the ignition switch to ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  24. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0122 indicated? 

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

    NO  -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

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