Code No. P1A4F: ROM Abnormal (BMU)




TROUBLE JUDGEMENT


Check Condition
  • The power supply mode of the electric motor switch is ON, or the drive battery starts to be charged.
Judgement Criterion
  • The ROM checksum error and the data cannot be read.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSE



  • The BMU is failed.

DIAGNOSIS PROCEDURE


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


Q. Is the diagnosis code stored?

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