Code No. P1A52: CMU01 Battery Cell Low Voltage Abnormal,
Code No. P1A53: CMU02 Battery Cell Low Voltage Abnormal,
Code No. P1A54: CMU03 Battery Cell Low Voltage Abnormal,
Code No. P1A55: CMU04 Battery Cell Low Voltage Abnormal,
Code No. P1A56: CMU05 Battery Cell Low Voltage Abnormal,
Code No. P1A58: CMU07 Battery Cell Low Voltage Abnormal,
Code No. P1A59: CMU08 Battery Cell Low Voltage Abnormal,
Code No. P1A5A: CMU09 Battery Cell Low Voltage Abnormal,
Code No. P1A5B: CMU10 Battery Cell Low Voltage Abnormal,
Code No. P1A5C: CMU11 Battery Cell Low Voltage Abnormal




TROUBLE JUDGEMENT


Check Conditions
  • The power supply mode of the electric motor switch is ON, or the drive battery starts to be charged.
  • The following diagnosis code is not stored.

  1. P1AA8: Local CAN (for drive battery) signal time-out
Judgement Criterion
  • The battery cell voltage is less than or equal to the specified value.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSE



  • The module (battery cell and CMU) in the drive battery is failed.

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Check the data list reference table corresponding to the diagnosis code (Refer to ).

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. M.U.T.-III data list



  • Check the CMU having an abnormality.
  • Reset the information about the malfunction of the CMU (Refer to GROUP 00 - Precautions Before Service - CMU EEPROM Failure Information Reset ).

  • CMU Data List Reference Table (Refer to )

  1. Item 4: Cell 01 voltage
  2. Item 5: Cell 02 voltage
  3. Item 6: Cell 03 voltage
  4. Item 7: Cell 04 voltage
  5. Item 8: Cell 05 voltage
  6. Item 9: Cell 06 voltage
  7. Item 10: Cell 07 voltage
  8. Item 11: Cell 08 voltage

Q. Are the diagnosis code stored?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 3.

STEP 3. M.U.T.-III data list



  • CMU Data List Reference Table (Refer to )

  1. Item 22: Cell monitor IC 1
  2. Item 23: Cell monitor IC 2
  3. Item 24: Cell monitor IC 3
  4. Item 25: Cell monitor IC 4
  5. Item 26: Cell monitor IC 5
  6. Item 27: Cell monitor IC 6
  7. Item 28: Voltage sensor
  8. Item 29: Microcomputer reference voltage
  9. Item 30: IC reference voltage
  10. Item 79: EEPROM Fail (numbering data read
  11. Item 80: EEPROM Fail (learning data read)
  12. Item 81: CAN controller
  13. Item 88: A/D conversion (reference voltage)
  14. Item 89: A/D conversion (temperature sensor 1)
  15. Item 90: A/D conversion (temperature sensor 2)
  16. Item 91: A/D conversion (temperature sensor 3)
  17. Item 92: A/D conversion (temperature sensor 4)
  18. Item 93: A/D conversion (temperature sensor 5)
  19. Item 95: A/D conversion (module voltage)
  20. Item 98: Bat-CAN (bus off)

Q. Are the check result normal?

Remove the battery tray cover (Refer to ). Replace the battery module having the abnormal battery cell. Then, assemble the drive battery assembly (Refer to ).
Remove the battery tray cover (Refer to ). Replace the CMU where the CMU ID is not numbered. Then, assemble the drive battery assembly (Refer to ).