Code No.U1100: Engine Time-out Error

  • If diagnosis code U1100 is set in the transfer-ECU, always diagnose the CAN main bus line.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.


Current trouble
Past trouble



STEP 1. M.U.T.-III CAN bus diagnostics

Using M.U.T.-III, perform CAN bus line diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ). and then go to Step 4.

STEP 2. M.U.T.-III other system diagnosis codes

Check whether the fuel system diagnosis codes are set or not.

Q. Is the diagnosis code set?

YES : Diagnose the fuel system (Refer to GROUP 13A - Troubleshooting <6G7>, or GROUP 13B - Troubleshooting <4M4>).
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code

Reconfirm whether the diagnosis codes are set from transfer-ECU.
(1)Erase the diagnosis code.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Go to Step 4.
Intermittent malfunction in CAN bus line between engine-ECU <4M4> or engine-A/T-ECU <6G7> and transfer-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 4. Replace the engine-ECU <4M4> or engine-A/T-ECU <6G7>

After replacing the engine-ECU <4M4> or engine-A/T-ECU <6G7>, re-check the transfer diagnosis code output.

Q. Is the diagnosis code set?

Replace the transfer-ECU.
The check is end.