Code No. U111C: BMU CAN time-out



caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.


OPERATION



  • BMU communicates with EV-ECU via CAN.

DIAGNOSIS CODE SET CONDITIONS



  • When the time-out of the BMU CAN data is determined, the diagnosis code No. U111C will be set.

PROBABLE CAUSES



  • Damaged wiring harness or connector(s)
  • Malfunction of the BMU CAN data system

DIAGNOSIS PROCEDURE


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


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

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


Check again if the diagnosis code No. U111C is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.


Check if the diagnosis code is set to BMU.

Q. Is the diagnosis code set?

Carry out troubleshooting for the BMU. (Refer to .)
Go to Step 4.

STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.


Check if the diagnosis code No. U111C is set to the compressor & heater controller.

Q. Is the diagnosis code set?

Go to Step 5.
Go to Step 6.

STEP 5. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor 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 BMU. (Refer to .)
A poor connection, open circuit of the wiring harness or other intermittent malfunction is present in the CAN bus line between the BMU and EV-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction)

STEP 6. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor 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 EV-ECU. (Refer to .)
A poor connection, open circuit of the wiring harness or other intermittent malfunction is present in the CAN bus line between the BMU and EV-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction)