Code No. U1100: EV-ECU 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.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • The CAN bus line is defective.
  • Malfunction of the MCU
  • Malfunction of the EV-ECU

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 lines. (Refer to GROUP 54C - Troubleshooting .) After the repair, go to Step 2.

STEP 2. Diagnosis code recheck
Check again if the diagnosis code No. U1100 is set to the MCU.
(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. M.U.T.-III Diagnosis code of other systems
Check if the diagnosis code is set to the EV-ECU.

Q. Is the diagnosis code set?
Carry out troubleshooting for the EV-ECU. (Refer to .)
Go to Step 4.

STEP 4. M.U.T.-III Diagnosis code of other systems
Check if the combination meter-related diagnosis code is set.

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 MCU.
(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 EV-ECU and MCU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .)

STEP 6. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(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 MCU. (Refer to .)
A poor connection, open circuit of the wiring harness or other intermittent malfunction is present in the CAN bus line between the EV-ECU and MCU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .)