HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A7F-123

DTC Code DTC Name
P0A7F-123 Hybrid Battery Pack Deterioration

DESCRIPTION

The battery smart unit sends information about the condition of the HV battery to the hybrid vehicle control ECU. The hybrid vehicle control ECU then calculates the SOC (state of charge) based on this information and controls HV battery charge and discharge according to the driving conditions.

A01GXWME01
DTC Code DTC Detection Condition Trouble Area
P0A7F-123

  • The internal resistance of the HV battery is higher than the standard (1 trip detection)

  • The difference in the capacity between battery blocks is larger than the standard (2 trip detection)

  • HV battery

  • Battery smart unit

Tech Tips

This DTC cannot be set unless the vehicle is driven for approximately 10 minutes after clearing the DTCs. Two trip detection logic is used. After the first road test, turn the power switch off and perform a road test again.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTCS (DTC P0AFC-123 IS OUTPUT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0AFC-123 is not output. A
      P0AFC-123 is output. B

    B

    GO TO DTC (P0AFC-123) Click here

    A

  2. CHECK BATTERY SMART UNIT


    1. Make sure the areas in front and at the back of the vehicle are safe.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (READY).

    4. Select the following menu items: Powertrain / Hybrid Control / Data List / Battery Block Vol - V01 to V20.

    5. Fully warm up the engine and turn the air conditioning off.

    6. Firmly depress the brake pedal with your left foot.

    7. Move the shift lever to the D position.

    8. Record each battery block voltage in the data list ("Battery Block Vol - V01 to V20") while fully depressing the accelerator pedal.

    9. Compare the battery block voltages ("Battery Block Vol - V01 to V20") between the even and odd number groups in each combination shown in the table below.

      Odd number group Even number group Battery block voltages to be compared
      Battery Block Vol - V01 Battery Block Vol - V02 Battery Block Vol - V01 - Battery Block Vol - V02
      Battery Block Vol - V03 Battery Block Vol - V04 Battery Block Vol - V03 - Battery Block Vol - V04
      Battery Block Vol - V05 Battery Block Vol - V06 Battery Block Vol - V05 - Battery Block Vol - V06
      Battery Block Vol - V07 Battery Block Vol - V08 Battery Block Vol - V07 - Battery Block Vol - V08
      Battery Block Vol - V09 Battery Block Vol - V10 Battery Block Vol - V09 - Battery Block Vol - V10
      Battery Block Vol - V11 Battery Block Vol - V12 Battery Block Vol - V11 - Battery Block Vol - V12
      Battery Block Vol - V13 Battery Block Vol - V14 Battery Block Vol - V13 - Battery Block Vol - V14
      Battery Block Vol - V15 Battery Block Vol - V16 Battery Block Vol - V15 - Battery Block Vol - V16
      Battery Block Vol - V17 Battery Block Vol - V18 Battery Block Vol - V17 - Battery Block Vol - V18
      Battery Block Vol - V19 Battery Block Vol - V20 Battery Block Vol - V19 - Battery Block Vol - V20

    10. Check if the difference in the voltage of each combination is 0.3 V or more.

      Result
      Result Proceed to
      Difference in voltage of each combination is 0.3 V or more. A
      Other than above B

      Tech Tips


      • The difference in the voltage of each combination may be 0.3 V or more due to a battery smart unit internal error.

      • Refer to the wiring diagram for DTC P0A80-123 Click here.

      A01GY1QE01

    B

    REPLACE HV BATTERY Click here

    A

    REPLACE BATTERY SMART UNIT Click here