Code No. P1A4B: Voltage Of Each Battery Cell Abnormal




TROUBLE JUDGEMENT


Check Conditions
  • 3 seconds elapse after the electric motor switch is turned "ON", or 3 seconds elapse after the traction battery starts to be charged.
  • The absolute value of the current is less than 1 A.
  • The energy level gauge is more than 4 segments.
  • None of the following diagnosis codes occur at the same time.

    1. P1AA8: Local CAN (for traction battery) signal time-out
    2. U1082: Local CAN (for traction battery) bus off
Judgement Criterion
  • Difference in voltage values each battery cell is more than 0.08 V.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSE



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

DIAGNOSIS PROCEDURE


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


Reconfirm whether the diagnosis codes are set from BMU.

  1. Erase the diagnosis codes being set.
  2. Electric motor switch: "LOCK" (OFF) → "ON"
  3. After 10 seconds, also the energy level gauge of the combination meter confirm more than 4 segments.

Q. Is the diagnosis code set?

Replace the traction battery.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).




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