DTC P0A7F-123: Hybrid Battery Pack Deterioration [10/2013 - ]: Description

• The battery voltage sensor and the power management control ECU calculate the SOC (state of charge) of the HV battery through the accumulated amperage in the HV battery. The battery voltage sensor sends the condition of the HV battery to the power management control ECU. Then the power management control ECU calculates the SOC based on the information and controls HV battery charge and discharge according to the driving condition.
• Based on the HV battery voltage and current, the battery voltage sensor calculates the resistance and judges that the HV battery has deteriorated.
  Fig 1: State Of Charge (SOC) Level Chart

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  DTC No.	INF Code	DTC Detection Condition	Trouble Area
  P0A7F	123	When either condition below is met: Resistance of an HV battery block exceeds the standard value (1 trip detection logic) Difference in capacity between each battery block is larger than the standard (2 trip detection logic)	HV battery Battery voltage sensor

  RELATED DATA LIST
  
  

  DTC No.	Data List
  P0A7F-123	Internal Resistance R01 to R17 State of Charge (All Bat) Battery Block Vol -V01 to V17

HINT: 

P0A7F-123 will not be set unless the vehicle is driven for approximately 10 minutes after clearing the DTC. (As 2 trip detection logic is used, check for DTCs including pending DTCs.)