HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A7F-123

DTC Code	DTC Name
P0A7F-123	Battery Pack Deterioration

DESCRIPTION

The battery voltage sensor and the EV control ECU calculate the SOC (state of charge) of the EV battery through the accumulated amperage in the EV battery. The battery voltage sensor sends the condition of the EV battery to the EV control ECU. Then the EV control ECU calculates the SOC based on the information and controls EV battery charge and discharge according to the driving condition.

Based on the EV battery voltage and current, the battery voltage sensor calculates the resistance and judges that the EV battery has deteriorated.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate
P0A7F-123	Battery Pack Deterioration	Either of the following conditions is met: Resistance of an EV battery block exceeds the specified value. (1 trip detection logic) Difference in capacity between each battery block is larger than the standard. (2 trip detection logic)	Battery voltage sensor EV battery	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

P0A7F-123

Battery Pack Deterioration

Either of the following conditions is met:

Resistance of an EV battery block exceeds the specified value.

(1 trip detection logic)
Difference in capacity between each battery block is larger than the standard.

(2 trip detection logic)

Battery voltage sensor
EV battery

Master Warning Light:

Comes on

DTC Detection Condition Patterns:
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	-	-	-
Malfunction Condition	Resistance of an EV battery block exceeds the specified value	○	-
Malfunction Condition	Difference in capacity between each battery block is larger than the standard	-	○
Duration		-	-
Detection Logic		1 trip	2 trip

Tech Tips

This DTC is output when either of the above detection patterns is met.

Related Data List
DTC No.	Data List
P0A7F-123	Internal Resistance R01 to R17 State of Charge (All Battery) Battery Block Voltage -V01 to V17

The following items can be helpful when performing repairs:

Data List (EV)

Ready Signal
Vehicle Speed
Accelerator Degree
Shift Sensor Shift Position
VB-Battery Voltage
Battery Pack Current Value (IB Correction)
Auxiliary Battery Voltage
Battery Voltage Low Time
DC Discharge Inhibit Time
SOC after IG-ON
Status of Charge Max
Status of Charge Min
Total Distance Traveled

Data List (FC)

FC Mode
FC Intermittent Operation
FC Voltage before Boosting
FC Current
Hydrogen Remaining

Operation History Data

Battery Low Voltage-Last Operation
Battery Low Voltage-Last Trip

Tech Tips

This DTC can be stored after clearing DTCs and driving the vehicle for approximately 10 minutes. (As 2 trip detection logic is also used, check for DTCs including pending DTCs.)
When the internal resistance of the EV battery increases, battery block voltage may drop.
In order to ensure EV battery performance, appropriate cooling performance must be maintained. Perform the following items as necessary. If cooling performance has decreased and "MAINTENANCE REQUIRED FOR HYBRID BATTERY COOLING PARTS AT YOUR DEALER" is displayed on the multi-information display, make sure to perform the following items:

- 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 EV battery intake duct (filter).

Afterwards, clear the DTCs to reset the learning values even if no DTCs are stored.

CAUTION / NOTICE / HINT

Note

When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips

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

Turn the power switch on (READY) and wait for 30 seconds or more.

Drive the vehicle on urban roads at a speed of 40 km/h (25 mph) or more for a total of at least 10 minutes (It is not necessary to maintain the vehicle speed at 40 km/h (25 mph) throughout the road test).

Note

Avoid abrupt acceleration or braking.

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

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

PROCEDURE

CHECK DTC OUTPUT (EV)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / EV / Trouble Codes.
Check and record any hybrid control system DTCs, INF codes and freeze frame data.

Read output DTCs.

Powertrain > EV > Trouble Codes

Result

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

Turn the power switch off.
Disconnect the GTS from the DLC3.

GO TO DTC CHART (P0AFC-123) Click here

READ VALUE USING GTS (VB1 - VB17)

Result

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

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).
Turn the air conditioning off and wait for 5 minutes or more.
Enter the following menus: Powertrain / EV / Data List / Battery Block Voltage -V01 to V17.
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 Voltage -V01 to V17" while fully depressing the accelerator pedal.

Powertrain > EV > Data List

Tester Display
Battery Block Voltage -V01
Battery Block Voltage -V02
Battery Block Voltage -V03
Battery Block Voltage -V04
Battery Block Voltage -V05
Battery Block Voltage -V06
Battery Block Voltage -V07
Battery Block Voltage -V08
Battery Block Voltage -V09
Battery Block Voltage -V10
Battery Block Voltage -V11
Battery Block Voltage -V12
Battery Block Voltage -V13
Battery Block Voltage -V14
Battery Block Voltage -V15
Battery Block Voltage -V16
Battery Block Voltage -V17

Compare the Battery Block Voltages "Battery Block Voltage -V01 to V17" between the even and odd number groups in each combination shown in the tables below.

Table 1
Circuit A Battery Block	Circuit B Battery Block	Condition
Battery Block Voltage -V01 (VB1)	Battery Block Voltage -V02 (VB2)	"Battery Block Voltage -V01" - "Battery Block Voltage -V02" = 0.3 V or more
Battery Block Voltage -V04 (VB4)	Battery Block Voltage -V03 (VB3)	"Battery Block Voltage -V04" - "Battery Block Voltage -V03" = 0.3 V or more
Battery Block Voltage -V05 (VB5)	Battery Block Voltage -V06 (VB6)	"Battery Block Voltage -V05" - "Battery Block Voltage -V06" = 0.3 V or more
Battery Block Voltage -V08 (VB8)	Battery Block Voltage -V07 (VB7)	"Battery Block Voltage -V08" - "Battery Block Voltage -V07" = 0.3 V or more
Battery Block Voltage -V09 (VB9)	Battery Block Voltage -V10 (VB10)	"Battery Block Voltage -V09" - "Battery Block Voltage -V10" = 0.3 V or more
Battery Block Voltage -V12 (VB12)	Battery Block Voltage -V11 (VB11)	"Battery Block Voltage -V12" - "Battery Block Voltage -V11" = 0.3 V or more
Battery Block Voltage -V13 (VB13)	Battery Block Voltage -V14 (VB14)	"Battery Block Voltage -V13" - "Battery Block Voltage -V14" = 0.3 V or more
Battery Block Voltage -V16 (VB16)	Battery Block Voltage -V15 (VB15)	"Battery Block Voltage -V16" - "Battery Block Voltage -V15" = 0.3 V or more
Battery Block Voltage -V17 (VB17)	Battery Block Voltage -V14 (VB14)	"Battery Block Voltage -V17" - "Battery Block Voltage -V14" = 0.3 V or more

Table 2
Circuit A Battery Block	Circuit B Battery Block	Condition
Battery Block Voltage -V01 (VB1)	Battery Block Voltage -V02 (VB2)	"Battery Block Voltage -V02" - "Battery Block Voltage -V01" = 0.3 V or more
Battery Block Voltage -V04 (VB4)	Battery Block Voltage -V03 (VB3)	"Battery Block Voltage -V03" - "Battery Block Voltage -V04" = 0.3 V or more
Battery Block Voltage -V05 (VB5)	Battery Block Voltage -V06 (VB6)	"Battery Block Voltage -V06" - "Battery Block Voltage -V05" = 0.3 V or more
Battery Block Voltage -V08 (VB8)	Battery Block Voltage -V07 (VB7)	"Battery Block Voltage -V07" - "Battery Block Voltage -V08" = 0.3 V or more
Battery Block Voltage -V09 (VB9)	Battery Block Voltage -V10 (VB10)	"Battery Block Voltage -V10" - "Battery Block Voltage -V09" = 0.3 V or more
Battery Block Voltage -V12 (VB12)	Battery Block Voltage -V11 (VB11)	"Battery Block Voltage -V11" - "Battery Block Voltage -V12" = 0.3 V or more
Battery Block Voltage -V13 (VB13)	Battery Block Voltage -V14 (VB14)	"Battery Block Voltage -V14" - "Battery Block Voltage -V13" = 0.3 V or more
Battery Block Voltage -V16 (VB16)	Battery Block Voltage -V15 (VB15)	"Battery Block Voltage -V15" - "Battery Block Voltage -V16" = 0.3 V or more
Battery Block Voltage -V17 (VB17)	Battery Block Voltage -V14 (VB14)	"Battery Block Voltage -V14" - "Battery Block Voltage -V17" = 0.3 V or more

Tech Tips

Make sure to compare Battery Block Voltage -V17 to Battery Block Voltage -V14 in accordance with the tables above.

Tech Tips

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

Result

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

Turn the power switch off.
Disconnect the GTS from the DLC3.

REPLACE BATTERY VOLTAGE SENSOR Click here

REPLACE EV BATTERY Click here