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Home >> Acura >> 2012 >> TL Base >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC U0131: F-CAN Malfunction (ECM/PCM-EPS Control Unit)

DTC U0131: F-CAN Malfunction (ECM/PCM-EPS 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), or press the engine start/stop button to select the ON mode.
  2. Check for Pending or Confirmed DTCs with the HDS.

    Are DTC U0029 and U0131 indicated at the same time? 

    YES  - Go to the troubleshooting for DTC U0029 . ■

    NO  - Go to step 3.

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

    Is DTC U0131 indicated? 

    YES  - Go to step 5.

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

  5. Check for communication the EPS system with the HDS.

    Does the HDS communicate with the EPS control unit? 

    YES  - Go to step 6.

    NO  - Go to the symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored (see EPS INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED ). ■

  6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  7. Jump the SCS line with the HDS.
  8. Disconnect EPS control unit connector D (28P).
  9. Disconnect ECM/PCM connector A (49P).
  10. Check for continuity between ECM/PCM connector terminal A48 and EPS control unit connector D (28P) terminal No. 1.
    Fig 1: Checking Continuity Between ECM/PCM Connector Terminal A48 And EPS Control Unit Connector D (28P)
    G08069531Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 11.

    NO  - Repair open in the wire between the ECM/PCM (A48) and the EPS control unit, then go to step  12.

  11. Check for continuity between ECM/PCM connector terminal A49 and EPS control unit connector D (28P) terminal No. 15.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminal A49 And EPS Control Unit Connector D (28P)
    G08069532Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Substitute a known-good EPS control unit (see RACK GUIDE REMOVAL/INSTALLATION ), then go to step 12 and recheck. If DTC U0131 is not indicated, replace the original EPS control unit (see RACK GUIDE REMOVAL/INSTALLATION ), then go to step 12.

    NO  - Repair open in the wire between the ECM/PCM (A49) and the EPS control unit, then go to step 12.

  12. Reconnect all connectors.
  13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  14. Reset the ECM/PCM with the HDS.
  15. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  16. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0131 indicated? 

    YES  - Check for poor connections or loose terminals at the EPS control unit and the ECM/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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