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DTC P1A4F: ROM fail
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
TROUBLE JUDGMENT
Check Condition
  • The power supply mode of the electric motor switch is ON, or the main drive lithium-ion battery starts to be charged.
Judgment Criterion
  • The ROM checksum error and the data cannot be read.
 
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Not available
 
 
PROBABLE CAUSE
  • The battery management unit (BMU) is failed.
 
 
 
 
DIAGNOSIS
Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.