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DTC No. P0A7F-00 Stack internal resistance deterioration diagnosis (stack1)
 
 
 
 
MONITOR EXECUTION
Continuous
 
 
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
  • EV CAN monitor
Sensor (The sensor below is determined to be normal)
  • Drive battery current sensor
  • Drive battery temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
Check Condition
  • The BMU power supply voltage is more than 7.578 volts for 1 second or more.
  • The vehicle status is in propulsion system active condition.
  • The change of battery current is 30 amperes or more.
  • The minimum drive battery temperature is -6°C (21°F) or less.
  • The SOC is less than 90% and more than 15%.
Judgment Criterion
  • The maximum cell internal resistance (battery module No. 1) exceeds the specified value for 1 second or more ten times.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the cell voltage wiring harness (battery module No. 1 system)
  • Malfunction of the drive battery (battery module No. 1)
  • Looseness or foreign material attached on the bus bar
  • Malfunction of the BMU
 
 
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 the following DTC.
  • DTC No. P0A1F-00 ECU Internal Failure
Is the DTC set?
Troubleshoot the set DTCs (Refer to DIAGNOSTIC TROUBLE CODE CHART). Then,
 
2.Check the looseness or foreign material attached on the bus bar
(1) Disassemble 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 the faulty part. Then,
 
3.Cell voltage harness check
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 drive battery (Refer to DRIVE BATTERY REMOVAL AND INSTALLATION). Then,
Check the cell voltage wiring harness of the battery module No. 1 (Refer to SERVICE PROCEDURE). Then,
 
4.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.