( TF09EACK721000U0131FAAT00 )
DTC Troubleshooting: U0131 (126)
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.
  1. Turn the ignition switch to ON (II).
  1. Check for Temporary DTCs or 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 .
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or 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.■
  1. Check for communication to the EPS system with the HDS.
Does the HDS communicate with the EPS control unit?
YES -
Go to Step 6 .
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect EPS control unit C (16P) connector.
  1. Disconnect ECM/PCM connector A (49P).
  1. Connect EPS control unit connector terminal C10 to body ground with a jumper wire.
  1. Check for continuity between ECM/PCM connector terminal A3 and body ground.
Is there continuity?
YES -
Go to Step 12 .
NO -
Repair open in the wire between the ECM/PCM (A3) and the EPS control unit, then go to Step 14 .
  1. Connect EPS control unit connector terminal C9 to body ground with a jumper wire.
  1. Check for continuity between ECM/PCM connector terminal A4 and body ground.
Is there continuity?
YES -
Substitute a known-good EPS control unit, then go to Step 14 and recheck. If DTC U0131 is not indicated after substitution, replace the original EPS control unit, then go to Step 14 .
NO -
Repair open in the wire between the ECM/PCM (A4) and the EPS control unit, then go to Step 14 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Check for Temporary DTCs or 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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■