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DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B8B, P0B90, P0BA9, P0BAE, P0BB3, P0BB8: Cell Voltage Sensor Open,
DTC P32EA, P32EB, P32EC, P32F1, P32F2, P32F3, P32F4, P32F5, P32F6, P32F7, P32FC, P32FD, P32FE, P32FF, P3300, P3301, P3302, P3312, P3313, P3314, P3315, P3316, P3317, P3318, P331D, P331E, P331F, P3320, P3321, P3322, P3323, P3328, P3329, P332A, P332B, P332C, P332D, P332E, P3333, P3334, P3335, P3336, P3337, P3338, P3339, P333E, P333F, P3340, P3341, P3342, P3343, P3344: Cell Voltage Sensor Open
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
  • The battery management unit (BMU) uses transistors which switch on and off to balance the voltage difference between cells.
  • The main drive lithium-ion battery voltage sensor circuit failure is detected using the cell balancing operation.
 
 
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)
  • Main drive lithium-ion battery cell voltage monitor
  • Battery CAN monitor
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • battery management unit (BMU) power supply voltage is 8 volts to 16 volts.
  • Time after above conditions satisfy is more than 2 seconds.
Judgment Criterion
  • When the transistor switch of the failed battery cell number is on, the voltage of the failed battery cell number changes to 2.1 volts or less.
  • When the transistor switch of the failed battery cell number is off, the voltage of the failed battery cell number changes to 4.6 volts or more.
  • When the transistor switch before the failed battery cell number is on, the voltage before the failed battery cell number changes to 4.6 volts or more.
  • When the transistor switch before the failed battery cell number is off, the voltage before the failed battery cell number changes to 2.1 volts or less.
Judgment Criterion
  • When the transistor switch of the failed battery cell number is on, the voltage of the failed battery cell number changes to 4.6 volts or more.
  • When the transistor switch of the failed battery cell number is off, the voltage of the failed battery cell number changes to 2.1 volts or less.
  • When the transistor switch before the failed battery cell number is on, the voltage before the failed battery cell number changes to 2.1 volts or less.
  • When the transistor switch before the failed battery cell number is off, the voltage before the failed battery cell number changes to 4.6 volts or more.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to OBD-II Drive Cycle - Pattern 1 .
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Not available
 
 
PROBABLE CAUSE
  • The module (battery cell and CMU) in the main drive lithium-ion battery is failed.
 
 
 
 
DIAGNOSIS
STEP 1. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle - Pattern 1 .
(2) Check if the DTC is set.
Is the DTC set?
Replace the main drive lithium-ion battery (Refer to ). Then go to Step 2.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
 
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle - Pattern 1 .
(2) Check if the DTC is set.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.