A/T

DTC Troubleshooting: U0131, U0131

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 How to Troubleshoot the Fuel and Emissions Systems.

1. Turn the ignition switch to ON (II).

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 A/T.

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. Start the engine, and watch the EPS indicator.

Does the indicator come on and go off?

YES -

Go to step 6.

NO -

Turn the ignition switch to LOCK (0), and go to the symptom troubleshooting for an EPS indicator does not go off, and no DTCs are stored Symptom Troubleshooting.

6. Turn the ignition switch to LOCK (0).

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 A3 and EPS control unit connector D (28P) terminal No. 1.





Is there continuity?

YES -

Go to step 11.

NO -

Repair an open in the wire between the ECM/PCM(A3) and the EPS control unit, then go to step 12.

11. Check for continuity between ECM/PCM connector terminal A4 and EPS control unit connector D (28P) terminal No. 15.





Is there continuity?

YES -

Substitute a known-good EPS control unit Service and Repair, then go to step 12 and recheck. If DTC U0131 is not indicated, replace the original EPS control unit Service and Repair, then go to step 12.

NO -

Repair an open in the wire between the ECM/PCM(A4) and the EPS control unit, then go to step 12.

12. Reconnect all connectors.

13. Turn the ignition switch to ON (II).

14. Reset the ECM/PCM with the HDS.

15. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (M/T).

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.