DTC Troubleshooting: U0101 (126)
DTC U0101:
 F-CAN Malfunction (ECM-TCM)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC U0101 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module (tach), the TCM, and the ECM.■
  1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS again.
Are DTC U0028 and U0101 indicated at the same time?
YES -
Go to troubleshooting DTC U0028. ■
NO -
Go to Step 5 .
  1. Turn the ignition switch OFF.
  1. Check the AMT (40 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES -
Go to Step 7 .
NO -
Repair short in the wire between the AMT (40 A) fuse and the TCM. Also replace the AMT (40 A) fuse, then go to Step 20 .
  1. Remove the TCM.
  1. Check for poor connections at TCM connector A (37P).
Are the connections OK?
YES -
Go to Step 9 .
NO -
Repair the poor connections or loose terminals at TCM connector A (37P), then go to Step 20 .
  1. Disconnect TCM connector A (37P).
  1. Reconnect the engine compartment wire harness 10P connector; LHD model, RHD model.
  1. Reconnect the ground cable of the TCM to the transmission.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between TCM connector A (37P) terminal No. 28 and body ground.
Is there battery voltage?
YES -
Go to Step 14 .
NO -
Repair open in the wire between the AMT (40 A) fuse and the TCM, then go to Step 20 .
  1. Turn the ignition switch OFF.