Code No. P1AC7: CMU01 Battery Cell Resistance Abnormal,
Code No. P1AC8: CMU02 Battery Cell Resistance Abnormal,
Code No. P1AC9: CMU03 Battery Cell Resistance Abnormal,
Code No. P1ACA: CMU04 Battery Cell Resistance Abnormal,
Code No. P1ACB: CMU05 Battery Cell Resistance Abnormal,
Code No. P1ACD: CMU07 Battery Cell Resistance Abnormal,
Code No. P1ACE: CMU08 Battery Cell Resistance Abnormal,
Code No. P1ACF: CMU09 Battery Cell Resistance Abnormal,
Code No. P1AD0: CMU10 Battery Cell Resistance Abnormal,
Code No. P1AD1: CMU11 Battery Cell Resistance Abnormal




TROUBLE JUDGEMENT


Check Conditions
  • During the normal charging
  • None of the following diagnosis codes occur at the same time.

  1. P1AA8: Local CAN (for drive battery) signal time-out
  2. P1AAC: Drive battery current sensor signal time-out
  3. P1AAD: Drive battery current sensor fail (CAN)
Judgement Criterion
  • Difference in resistance values inside battery cells is great.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSE



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

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code


(1)Check the value shown on the BMU Data List item No. 10 Module minimum temperature. If the lowest module temperature is less than or equal to 10°C, charge and discharge the drive battery. Increase the module temperature.
(2)Check the value shown on the BMU Data List item No. 1 Charge state (Control). If the value is more than or equal to 70%, discharge it to be less than or equal to 60%.
(3)Erase the stored diagnosis codes.
(4)Charge it so that the value shown on the BMU Data List item No. 1 Charge state (Control) can become more than or equal to 70%.

Q. Is the diagnosis code stored?

Remove the battery tray cover (Refer to ). Replace the battery module having the abnormal battery cell. Then, assemble the drive battery assembly (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).