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 / Trouble Codes.

   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 / Batt 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 (Batt block Vol -V01 to V14) while fully depressing the accelerator pedal.

   9. Compare the battery block voltages (VB0 to 13 Batt block) between the even and odd number groups in each combination shown in the table below.

      Even Number Group	Odd number group	Battery block voltages to be compared
      V0 BATT BLOCK	V1 BATT BLOCK	VB0 - VB1
      V2 BATT BLOCK	V3 BATT BLOCK	VB2 - VB3
      V4 BATT BLOCK	V5 BATT BLOCK	VB4 - VB5
      V6 BATT BLOCK	V7 BATT BLOCK	VB6 - VB7
      V8 BATT BLOCK	V9 BATT BLOCK	VB8 - VB9
      V10 BATT BLOCK	V11 BATT BLOCK	VB10 - VB11
      V12 BATT BLOCK	V13 BATT BLOCK	VB12 - VB13

   10. Check the difference in voltage of each combination.

       Result

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

       Tech Tips

       If the difference in voltage of each combination is 0.3 V or higher, it is due to a battery smart unit internal error.

   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