HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A7F-123

DTC Code	DTC Name
P0A7F-123	Hybrid Battery Pack Deterioration

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.	INF Code	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

CAUTION:

When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.

Tech Tips

After the repair, clear the DTCs, perform the following operations, and check that no DTCs (including pending DTCs) are output.

Drive the vehicle on urban roads for approximately 10 minutes or more.

This DTC may not be stored if the vehicle is stopped or being driven at a constant speed.

PROCEDURE

CHECK FOR DTCS (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Read output DTCs.

Result

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

Turn the power switch off.

GO TO DTC CHART (P0AFC-123) Click here

READ VALUE USING GTS (VB01 - VB20)

Ensure the safety of the areas in front and at the back of the vehicle.
Apply the parking brake and secure the wheels using chocks.
Connect the GTS to the DLC3.
Turn the power switch on (READY).
Fully warm up the engine and turn the air conditioning off.
Enter the following menus: Powertrain / Hybrid Control / Data List / Battery Block Vol -V01 to V20.
Firmly depress the brake pedal with your left foot.
Move the shift lever to D.
Record each battery block voltage from the Data List "Battery Block Vol -V01 to V20" while fully depressing the accelerator pedal.

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.

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 mor
Battery Block Vol - V13 (VB13)	Battery Block Vol - V14 (VB14)	"Battery Block Vol - V13" - "Battery Block Vol - V14" = 0.3 V or more
Battery Block Vol - V16 (VB16)	Battery Block Vol - V15 (VB15)	"Battery Block Vol - V16" - "Battery Block Vol - V15" = 0.3 V or more
Battery Block Vol - V17 (VB17)	Battery Block Vol - V18 (VB18)	"Battery Block Vol - V17" - "Battery Block Vol - V18" = 0.3 V or more
Battery Block Vol - V20 (VB20)	Battery Block Vol - V19 (VB19)	"Battery Block Vol - V20" - "Battery Block Vol - V19" = 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 - V12" = 0.3 V or more
Battery Block Vol - V16 (VB16)	Battery Block Vol - V15 (VB15)	"Battery Block Vol - V15" - "Battery Block Vol - V16" = 0.3 V or more
Battery Block Vol - V17 (VB17)	Battery Block Vol - V18 (VB18)	"Battery Block Vol - V17" - "Battery Block Vol - V18" = 0.3 V or more
Battery Block Vol - V20 (VB20)	Battery Block Vol - V19 (VB19)	"Battery Block Vol - V20" - "Battery Block Vol - V19" = 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 10pairs of blocks) will occur.

Result

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

Turn the power switch off.

REPLACE HV BATTERY Click here

REPLACE BATTERY SMART UNIT Click here