Code No.U0100 Engine CAN timeout


caution
  • If the diagnosis code No. U0100 is set, be sure to diagnose the CAN bus line.
  • Before replacing the ECU or combination meter, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

DIAGNOSTIC FUNCTION


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, the diagnosis code No. U1190 is not stored, 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 to the engine-ECU.

Q. Is the diagnosis code set?

Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart <4B1>, GROUP 13C -Troubleshooting <4J1>, GROUP 13D -Troubleshooting <4N1>)

Go to Step 3

STEP 3. Check the M.U.T.-III Diagnosis code for other systems


Check if the diagnosis code No. U0100 is set to ETACS-ECU.

Q. Is the diagnosis code set?

Go to Step 4

Go to Step 5

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set to 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.

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. Diagnosis code recheck


Check again if the diagnosis code is set to 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.

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 .)