DTC P0A7F-123: Hybrid Battery Pack Deterioration: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read output DTCs. Refer to DTC CHECK / CLEAR .

   Result

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

5. Turn the power switch off.
6. Disconnect the Techstream from the DLC3.

B → See step   5 

A: Go to next step 

1. Ensure the safety of the areas in front and at the back of the vehicle.
2. Connect the Techstream 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 V17.
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 V17) while fully depressing the accelerator pedal.
9. Compare the battery block voltages (Battery block Vol -V01 to V17) 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
   Battery block Vol - V15	Battery block Vol - V16	V15 - V16
   Battery block Vol - V17	Battery block Vol - V14	V17 - V14

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

    Result

    Result	Proceed to
    Difference in voltage of all 9 pairs of blocks is 0.3 V or more.	A
    Other than above.	B

    HINT: 

    When an internal malfunction occurs in the battery smart unit, this symptom (difference in voltage of 0.3 V or more for all 9 pairs of blocks) will occur.

    Fig 1: Identifying Battery Smart Unit Block Voltage Graph

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
11. Turn the power switch off.
12. Disconnect the Techstream from the DLC3.

B → See step   4 

A → See step   3