Code No. P1AF5: CMU ID automatic numbering error (BMU)


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 diagnosis code No. P1A9A, No. U1925 is set to the BMU, the diagnosis code No. P1AF5 will be set.

PROBABLE CAUSES



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

STEP 2. Diagnosis code recheck after resetting CAN bus lines
Check again if the diagnosis code No. P1AF5 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 No. P1A9A or U1925 is set to the BMU.

Q. Is the diagnosis code set?
Carry out troubleshooting for the diagnosis code No.P1A9A, No. U1925. Erase the diagnosis code, and then go to Step 4.
Go to Step 4.

STEP 4. 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?
Return to Step 1.
The diagnosis is complete.