HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A7F-123

DESCRIPTION

• The battery smart unit and the power management control ECU calculate the SOC (state of charge) of the HV battery through the accumulated amperage in the HV battery. The battery smart unit sends the condition of the HV battery to the power management control ECU. Then the power management control ECU calculates the SOC based on the information and controls HV battery charge and discharge according to the driving condition.

  

  DTC No.	DTC Detection Condition	Trouble Area
  P0A7F-123	Internal resistance of the HV battery is higher than the standard (1 trip detection) Difference in the capacity between battery blocks is larger than the standard (2 trip detection)	HV battery Battery smart unit

  Tech Tips

  P0A7F-123 will not be set unless the vehicle is driven for approximately 10 minutes after clearing the DTC.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (HV)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Enter the following menus: Powertrain / Hybrid Control / DTC.

   4. Check if DTCs are output.

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

   5. Turn the power switch off.

   
   

   B

   GO TO DTC CHART Click here

   A

2. CHECK BATTERY SMART UNIT

   
   

   1. Ensure the safety of the areas in front and at the back of the vehicle.

   2. Connect the intelligent tester to the DLC3.

   3. Turn the power switch on (READY).

   4. Enter the following menus: Powertrain / Hybrid Control / Data List / Battery block Vol -V01 to V14.

   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 select lever to D.

   8. Record each battery block voltage from the data list (Battery block Vol -V01 to V14) while fully depressing the accelerator pedal.

   9. Compare the battery block voltages (Battery block Vol -V01 to V14) 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	V01 - V02
      Battery block Vol - V03	Battery block Vol - V04	V03 - V04
      Battery block Vol - V05	Battery block Vol - V06	V05 - V06
      Battery block Vol - V07	Battery block Vol - V08	V07 - V08
      Battery block Vol - V09	Battery block Vol - V10	V09 - V10
      Battery block Vol - V11	Battery block Vol - V12	V11 - V12
      Battery block Vol - V13	Battery block Vol - V14	V13 - V14

   10. Check the difference between each pair of battery block voltages.

       Result
       Result Proceed to Difference in voltage of all 7 pairs of blocks is 0.3 V or more. A Other than above. B

       Tech Tips

       When an internal malfunction occurs in the battery smart unit, this symptom (difference in voltage of 0.3 V or more for all 7 pairs of blocks) will occur.

       

   11. Turn the power switch off.

   12. Disconnect the intelligent tester from the DLC3.

   
   

   B

   REPLACE HV BATTERY Click here

   A

   REPLACE BATTERY SMART UNIT Click here