P0A7F

HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A7F-123: Hybrid Battery Pack Deterioration

DTC P0A7F-123 - Hybrid Battery Pack Deterioration

DESCRIPTION
The battery smart unit and 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.









HINT: P0A7F cannot be set unless the vehicle is driven for approximately 10 minutes after clearing the DTCs. (For 2 trip detection, turn the power switch off and perform a road test again after the first road test.)

MONITOR DESCRIPTION

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 HV control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTCS (DTC P0A1F-123 IS OUTPUT)
(a) Connect the intelligent tester to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: DIAGNOSIS / OBD/MOBD / HV ECU / DTC INFO / CURRENT CODES.
(d) Check if DTCs are output.
Result:
DTC P0A1F-123 is output.
YES -- GO TO INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC
NO -- Continue to next step.
2. READ VALUE ON INTELLIGENT TESTER
(a) Ensure the safety of the areas in front and at the back of the vehicle.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the power switch on (READY).
(d) Select the following menu items: DIAGNOSIS / OBD/MOBD / HV ECU / DATA LIST / V1 to V17 BATT BLOCK.
(e) Fully warm up the engine and turn the air conditioning off.
(f) Firmly depress the brake pedal with your left foot.
(g) Move the shift lever to the D position.
(h) Record each battery block voltage from the data list (V1 to V17 BATT BLOCK) while fully depressing the accelerator pedal.
(i) Compare the battery block voltages (V1 to V17 BATT BLOCK) between the even and odd number groups in each combination shown in the table below.





(j) Check the voltage difference in the all 9 combinations.
OK:
The difference in voltage of all combinations is 0.3 V or more.
YES -- REPLACE BATTERY SMART UNIT
NO -- REPLACE HV BATTERY