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DTC P1E4A: ROM fail [BMU (SUB)], P1E4B: Arithmetic processing [BMU (SUB)]
 
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • 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. <P1E4A>
  • The RAM data error is detected. <P1E4B>
 
 
COMMENT ON TROUBLE SYMPTOM
Past trouble
  • For diagnosis procedures, refer to "How to treat past trouble" (refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble ).
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Not available
 
 
PROBABLE CAUSES
  • The sub-battery management unit [BMU (SUB)] is failed.
 
 
DIAGNOSIS
Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
(1) Erase the set DTC.
(2) Confirm whether the DTC P1E4A or P1E4B is set.
Is the DTC set?
Remove the battery tray cover (Refer to ). Replace the sub-battery management unit [BMU (SUB)] on main drive lithium-ion battery (Refer to ). Then, assemble the main drive lithium-ion battery assembly (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).