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. (As 2 trip detection logic is used, check for DTCs including pending DTCs.)

  • In order to ensure HV battery performance, appropriate cooling performance must be maintained. Perform the following items as necessary:

  
  

  • Make sure the air intake port is not blocked.

  • Make sure there are no gaps between the connecting parts of the ducts.

  • Clean the No. 1 hybrid battery intake filter.

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. READ VALUE USING INTELLIGENT TESTER (VB1 - VB14)

   
   

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

   2. Apply the parking brake and secure the wheels using chocks.

   3. Connect the intelligent tester to the DLC3.

   4. Turn the power switch on (READY).

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

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

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

   8. Move the select lever to D.

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

   10. 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.

       Table 1

       Circuit A Battery Block	Circuit B Battery Block	Condition
       Battery Block Vol -V01 (VB1)	Battery Block Vol -V02 (VB2)	"Battery Block Vol -V01" - "Battery Block Vol -V02" = 0.3 V or more
       Battery Block Vol -V04 (VB4)	Battery Block Vol -V03 (VB3)	"Battery Block Vol -V04" - "Battery Block Vol -V03" = 0.3 V or more
       Battery Block Vol -V05 (VB5)	Battery Block Vol -V06 (VB6)	"Battery Block Vol -V05" - "Battery Block Vol -V06" = 0.3 V or more
       Battery Block Vol -V08 (VB8)	Battery Block Vol -V07 (VB7)	"Battery Block Vol -V08" - "Battery Block Vol -V07" = 0.3 V or more
       Battery Block Vol -V09 (VB9)	Battery Block Vol -V10 (VB10)	"Battery Block Vol -V09" - "Battery Block Vol -V10" = 0.3 V or more
       Battery Block Vol -V12 (VB12)	Battery Block Vol -V11 (VB11)	"Battery Block Vol -V12" - "Battery Block Vol -V11" = 0.3 V or more
       Battery Block Vol -V13 (VB13)	Battery Block Vol -V14 (VB14)	"Battery Block Vol -V13" - "Battery Block Vol -V14" = 0.3 V or more

       Table 2

       Circuit A Battery Block	Circuit B Battery Block	Condition
       Battery Block Vol -V01 (VB1)	Battery Block Vol -V02 (VB2)	"Battery Block Vol -V02" - "Battery Block Vol -V01" = 0.3 V or more
       Battery Block Vol -V04 (VB4)	Battery Block Vol -V03 (VB3)	"Battery Block Vol -V03" - "Battery Block Vol -V04" = 0.3 V or more
       Battery Block Vol -V05 (VB5)	Battery Block Vol -V06 (VB6)	"Battery Block Vol -V06" - "Battery Block Vol -V05" = 0.3 V or more
       Battery Block Vol -V08 (VB8)	Battery Block Vol -V07 (VB7)	"Battery Block Vol -V07" - "Battery Block Vol -V08" = 0.3 V or more
       Battery Block Vol -V09 (VB9)	Battery Block Vol -V10 (VB10)	"Battery Block Vol -V10" - "Battery Block Vol -V09" = 0.3 V or more
       Battery Block Vol -V12 (VB12)	Battery Block Vol -V11 (VB11)	"Battery Block Vol -V11" - "Battery Block Vol -V12" = 0.3 V or more
       Battery Block Vol -V13 (VB13)	Battery Block Vol -V14 (VB14)	"Battery Block Vol -V14" - "Battery Block Vol -V13" = 0.3 V or more

       

       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.

       Result
       Result Proceed to All conditions in table 1 are met. A All conditions in table 2 are met. Other than above. B

   11. Turn the power switch off.

   12. Disconnect the intelligent tester from the DLC3.

   
   

   A

   REPLACE BATTERY SMART UNIT Click here

   B

   REPLACE HV BATTERY Click here