Code No.U109A: PHEV-ECU CAN lost (Electrical parking lock)



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

TROUBLE JUDGEMENT


The PHEV-ECU stores this diagnosis code when it cannot communicate with the electric parking driver unit via CAN correctly.

PROBABLE CAUSES



  • Malfunction of CAN bus
  • Malfunction of electrical parking driver unit
  • Malfunction of PHEV-ECU

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 lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. M.U.T.-III data list (Electrical parking driver unit)


Check that the following data list display contents are normal (Refer to GROUP 22D - Data List Reference Table ).
Data list
  • Item 14: CAN communication (lost) flag
Check condition
Normal condition
The parking lock status
Normal
OFF
Abnormal
ON

Q. Is the check result normal?

Go to Step 4.
Go to Step 3.

STEP 3. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn on the power supply mode of the electric motor switch.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the electrical parking driver unit (Refer to GROUP 22D - Electrical Parking Drive Unit ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

STEP 4. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn on the power supply mode of the electric motor switch.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).