DTC Troubleshooting: U0131 (184)
DTC U0131:
 F-CAN Malfunction (ECM-EPS Control Unit)
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Are DTC U0028 and U0131 indicated at the same time?
YES -
NO -
Go to Step 3 .
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs in the DTCs MENU 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 gauge control module (tach), the EPS control unit, and the ECM.■
  1. Check for communication to the EPS system.
Does the HDS communicate with the EPS system?
YES -
Go to Step 6 .
NO -
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect EPS control unit connector D (28P).
  1. Disconnect ECM connector No. 2 (58P).
  1. Connect ECM connector No. 2 terminal No. 47 to body ground with a jumper wire.
  1. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the EPS control unit and ECM connector No. 2 terminal No. 47, then go to Step 14 .
  1. Connect ECM connector No. 2 terminal No. 48 to body ground with a jumper wire.
  1. Check for continuity between EPS control unit connector D (28P) terminal No. 15 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the EPS control unit and ECM connector No. 2 terminal No. 48, then go to Step 13 .
  1. Reconnect all connectors.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM 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 gauge control module (tach), the EPS control unit, and the ECM, 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.■