The battery smart unit sends HV battery voltage information to the HV control ECU via serial communication.
DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0AIF
129
HV battery voltage circuit malfunction
Battery smart unit
MONITOR DESCRIPTION
The HV control ECU calculates the differences between the received HV battery voltage, boost converter voltage, and inverter voltage. If any of the differences exceed prescribed values, the HV control ECU determines that there is a malfunction in the battery voltage circuit. When the HV control ECU detects a malfunction, it illuminates the MIL and sets a DTC.
INSPECTION PROCEDURE
NOTICE:
Performing the check procedures for a long time with the shift lever in the N position may cause DTC P3000-388 to be output.
HINT:
To determine the normal conditions, put the vehicle into the READY-on state, move the shift lever to the N position, and check HV battery voltage (VB), pre-boost voltage (VL), and post-boost voltage (VH) in the DATA LIST after replacement of the battery smart unit.
