DTC P0DB4:00 [BECM (e-SKYACTIV)]

System malfunction location	BECM internal ASIC No.3 system: Balancing switch circuit malfunction
Detection condition	• The BECM detects that the balancing switch circuit voltage value in ASIC No.3 is 1.8 V or more. Precondition • The monitor voltage at each cell before the discharge switch turns on is less than 4.5 V.
Fail-safe	• Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [BECM (e-SKYACTIV)].)
Possible cause	High voltage battery malfunction • Internal parts malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

System malfunction location

BECM internal ASIC No.3 system: Balancing switch circuit malfunction

Detection condition

• The BECM detects that the balancing switch circuit voltage value in ASIC No.3 is 1.8 V or more.

Precondition

• The monitor voltage at each cell before the discharge switch turns on is less than 4.5 V.

Fail-safe

• Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [BECM (e-SKYACTIV)].)

Possible cause

High voltage battery malfunction

• Internal parts malfunction

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

<<High voltage>>

• If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.

• Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the BECM. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BECM (e-SKYACTIV)].)
No	Go to the next step.
3	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS HIGH VOLTAGE BATTERY • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Warning • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. • While performing this step, always operate the vehicle in a safe and lawful manner. ― Drive the vehicle under the snapshot data condition. • Perform the DTC inspection for the BECM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, replace the high voltage battery and perform the repair completion verification. (See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)
No	Go to the next step.
Repair completion verification	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

• Record the snapshot data.

Note

• Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

INSPECT FOR OTHER RELATED DTCs

• Perform the DTC inspection for the BECM.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [BECM (e-SKYACTIV)].)

Go to the next step.

PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS HIGH VOLTAGE BATTERY

• Clear the DTC recorded in the memory.

(See CLEARING DTC.)

• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

Warning

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

• While performing this step, always operate the vehicle in a safe and lawful manner.

― Drive the vehicle under the snapshot data condition.

• Perform the DTC inspection for the BECM.

(See DTC INSPECTION.)

• Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, replace the high voltage battery and perform the repair completion verification.

(See HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION.)

Go to the next step.

Repair completion verification

VERIFY IF OTHER DTCs DISPLAYED

• Perform the DTC inspection.

(See DTC INSPECTION.)

• Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

DTC troubleshooting completed.