P0A7F
P0A7F-123Description
The battery smart unit and the hybrid vehicle control ECU calculate the SOC (state of charge) of the HV battery based on the accumulated amperage in the HV battery. The battery smart unit sends a signal indicating the condition of the HV battery to the hybrid vehicle control ECU. The hybrid vehicle control ECU then calculates the SOC based on this information and controls HV battery charge and discharge according to the driving conditions.
DTC Logic
DTC Detection Logic
The battery smart unit calculates the resistance of the HV battery using amperage and voltage, and uses this resistance to determine the extent of deterioration of the HV battery. If the battery smart unit detects that the resistance of the HV battery has exceeded the standard, it determines that a malfunction has occurred. In addition, the battery smart unit monitors the SOC, and if the difference between the maximum and minimum SOC values exceeds the standard, it determines that a malfunction has occurred. When either of the DTC detection conditions is met, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
NOTE: P0A7F cannot be set unless the vehicle is driven for approximately 10 minutes after clearing the DTCs. (For 2 trip detection, turn ignition switch OFF and perform a road test again after the first road test.)
Diagnostic Procedure
Step 1-2:
Step 2 (Continued):
