DTC P0A80-123: Replace Hybrid Battery Pack [08/2013 - ]: Description

• The HV battery uses nickel metal-hydride batteries and does not require external charging. The power management control ECU controls the SOC (state of charge) of the HV battery at a constant level during driving. The HV battery is composed of 34 modules, and each module consists of six 1.2 V cells in series. The battery smart unit monitors battery block voltage at 17 locations. Each battery block is composed of 2 modules in a set.
  Fig 1: Identifying HV Battery Modules & Cells Diagram (1 Of 2)

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Fig 2: Identifying HV Battery Modules & Cells Diagram (2 Of 2)

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  DTC No.	INF Code	DTC Detection Condition	Trouble Area
  P0A80	123	Difference in voltage between battery blocks is larger than the standard (2 trip detection)	HV battery Battery smart unit

HINT: 

• P0A80-123 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.)
• DTC P0A80-123 is stored when a malfunction is detected in the HV battery or battery smart unit. If the HV supply battery is malfunctioning, the malfunction may not be reproduced when the condition of HV supply battery changes due to difference in the driving load (amperage), battery SOC and battery temperature. Therefore, use the freeze frame data when performing a repair.
  1. When the HV battery is malfunctioning:
     • - Voltage of 1 or a few battery blocks are dropped. (voltage difference from that of next block is 1 V or more.)
     • - Voltage of all battery blocks is output randomly with no pattern.
  2. When the battery smart unit is malfunctioning:
     • - Differences in battery block voltages have a certain pattern.