PGM-FI System

DTC Troubleshooting: U0131 (PGM-FI System)

DTC U0131: F-CAN Malfunction (PCM-EPS Control Unit)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

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. 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 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 DLC circuit troubleshooting. Testing and Inspection


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 PCM connector A (49P).

10. Connect PCM connector terminal A48 to body ground with a jumper wire.






11. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.

Is there continuity?
YES - Go to step 12.

NO - Repair open in the wire between the PCM (A48) and the EPS control unit, then go to step 14.






12. Connect PCM connector terminal A49 to body ground with a jumper wire.






13. Check for continuity between EPS control unit connector D (28P) terminal No. 15 and body ground.

Is there continuity?
YES - Substitute a known-good EPS control unit, Service and Repair then go to step 14 and recheck. If DTC U0131 is not indicated, replace the original EPS control unit, Service and Repair then go to step 14.

NO - Repair open in the wire between the PCM (A49) and the EPS control unit, then go to step 14.






14. Reconnect all connectors.

15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

16. Reset the PCM with the HDS.

17. Do the PCM idle learn procedure. PCM Idle Learn Procedure

18. 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 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.