Code No. P1A52: CMU01 battery cell low voltage abnormal, P1A53: CMU02 battery cell low voltage abnormal, P1A54: CMU03 battery cell low voltage abnormal, P1A55: CMU04 battery cell low voltage abnormal, P1A56: CMU05 battery cell low voltage abnormal, P1A57: CMU06 battery cell low voltage abnormal, P1A58: CMU07 battery cell low voltage abnormal, P1A59: CMU08 battery cell low voltage abnormal, P1A5A: CMU09 battery cell low voltage abnormal, P1A5B: CMU10 battery cell low voltage abnormal, P1A5C: CMU11 battery cell low voltage abnormal, P1A5D: CMU12 battery cell low voltage abnormal




TROUBLE JUDGMENT


Check Conditions
  • 3 seconds elapse after the electric motor switch is turned ON, or 3 seconds elapse after the main battery starts to be charged.
  • None of the following diagnosis codes occur at the same time.

  1. P1AA8: Local CAN (for main battery) signal time-out
  2. U1082: Local CAN (for main battery) bus off
Judgement Criterion
  • The battery cell voltage is less than 2.5 V.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSE



  • The module (battery cell, CMU and battery cell voltage sensor) in the main 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 ).
OK: 2.5 V or more

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 ).
Replace the main battery.