Code No.U0100 Engine CAN timeout



caution
  • If diagnosis code No. U0100 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

TROUBLE JUDGEMENT


The combination meter sets diagnosis code No.U0100 when it cannot receive signals from the engine-ECU.

JUDGEMENT CRITERIA


With the ignition switch is at ON position, diagnosis code No. U1190 is not set and diagnosis code No. U1195 is not set, if the communication with engine-ECU cannot be established for 5000 ms or more, the combination meter determines that a problem has occurred.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

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


Check if diagnosis code is set in the engine-ECU.

Q. Is the diagnosis code set?

Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart <4G6>, GROUP 13B - Diagnosis Code Chart <6B3>, GROUP 13C - Diagnosis Code Chart <4N1> or GROUP 13E - Diagnosis Code Chart <4D5>).

Go to Step 3.

STEP 3. Diagnosis code recheck


Check again if the diagnosis code is set in the combination meter.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU <4G6>, GROUP 13B - Engine-ECU <6B3>, GROUP 13C - Engine-ECU <4N1> or GROUP 13E - Engine-ECU <4D5>.) and then go to Step 4.

A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set in the combination meter.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the combination meter and then go to Step 5.

A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

STEP 5. Check whether the diagnosis code is set again.


Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not set again.

Q. Is the diagnosis code set?

Go to Step 1.

The procedure is complete.