Code No. P1A76: CMU01 battery cell voltage sensor abnormal, P1A77: CMU02 battery cell voltage sensor abnormal, P1A78: CMU03 battery cell voltage sensor abnormal, P1A79: CMU04 battery cell voltage sensor abnormal, P1A7A: CMU05 battery cell voltage sensor abnormal, P1A7B: CMU06 battery cell voltage sensor abnormal, P1A7C: CMU07 battery cell voltage sensor abnormal, P1A7D: CMU08 battery cell voltage sensor abnormal, P1A7E: CMU09 battery cell voltage sensor abnormal, P1A7F: CMU10 battery cell voltage sensor abnormal, P1A80: CMU11 battery cell voltage sensor abnormal, P1A81: CMU12 battery cell voltage sensor 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 signal is received from the appropriate module CMU, which shows that one of the battery cell voltage has an invalid value.

FAIL-SAFE AND BACKUP FUNCTION

  • If the CMU detecting abnormalities also detects the module temperature sensor abnormalities, drive the main battery cooling fan for 10 minutes.

PROBABLE CAUSE

  • The module (battery cell, CMU and battery cell voltage sensor) in the main battery is failed.
  • The BMU 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: Not 2.51 V (initial value) (electric motor switch: "LOCK" (OFF) → ON)

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. After replacing the main battery, reconfirm the diagnosis code.

  • After replacing the main battery, reconfirm whether the diagnosis codes are set.

Q. Is the diagnosis code set?
Replace the BMU.
Check end.