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DTC No. P0B24-00 Cell Voltage difference diagnosis(stack1)
 
 
 
 
MONITOR EXECUTION
Once per driving cycle (During the BMU activation)
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • BMU monitor
  • Drive battery voltage sensor circuit monitor
Sensor (The sensor below is determined to be normal)
  • Drive battery current sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
  • The BMU power supply voltage is more than 7.578 volts.
  • The average cell voltage is 3.56 volts or more.
  • The soaking time is 360 seconds or more.
Judgment Criterion
  • The value subtracting the minimum cell voltage of the battery module No. 1 from the average cell voltage of the battery module No. 1 deviates from the specified value.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the BMU
  • Looseness or foreign material attached on the bus bar
  • Malfunction of the drive battery (battery module No. 1)
  • Malfunction of the cell voltage wiring harness (battery module No. 1 system)
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.Check of other DTC
Check whether the BMU and BMU2 set other DTC.
Is the DTC set?
Troubleshoot the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART). Then,
 
2.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
3.Check the looseness or foreign material attached on the bus bar
(1) Diaseemble the drive battery (Refer to SERVICE PROCEDURE).
(2) Check that there is no looseness or foreign material attached on the bus bar of the battery module No. 1.
Is the check result normal?
Repair or replace the faulty part. Then,
 
4.Cell voltage harness check
(1) Disassemble the drive battery (Refer to SERVICE PROCEDURE).
(2) Check the cell voltage wiring harness of the battery module No. 1 (Refer to CELL VOLTAGE HARNESS CHECK).
Is the check result normal?
Replace the cell voltage harness (Refer to SERVICE PROCEDURE). Then,
 
5.Battery module No. 1 check
Check the battery module No. 1 (Refer to BATTERY MODULE CHECK).
Is the check result normal?
Replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION). Then,
Replace the drive battery (Refer to DRIVE BATTERY REMOVAL AND INSTALLATION). Then,
 
6.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.