HYBRID BATTERY SYSTEM, Diagnostic DTC:P0ABF-123, P0AC1-123, P0AC2-123, P0B10-123, P0B11-123

DTC Code	DTC Name
P0ABF-123	Hybrid Battery Pack Current Sensor Circuit
P0AC1-123	Hybrid Battery Pack Current Sensor Circuit Low
P0AC2-123	Hybrid Battery Pack Current Sensor Circuit High
P0B10-123	Hybrid Battery Pack Current Sensor "B" Circuit Low
P0B11-123	Hybrid Battery Pack Current Sensor "B" Circuit High

DESCRIPTION

A battery current sensor, which is mounted on the positive cable side of each hybrid battery junction block assembly, detects the current flowing to or from the battery pack. The battery current sensor sends a voltage, which varies between 0 and 5 V in proportion to the amperage, to the IB0 terminal of the battery smart unit. Similarly, it sends a voltage, which varies between 0 and 5 V in inverse proportion to the amperage, into the IB1 terminal of the battery smart unit. When the voltage of the IB0 terminal is below 2.8 V and the voltage of the IB1 terminal is above 2.2 V, this indicates that the HV battery is being discharged. Meanwhile, when the voltage of the IB0 terminal is above 2.8 V and the voltage of the IB1 terminal is below 2.2 V, this indicates that the HV battery is being charged. The battery smart unit sends the signals from its IB0 and IB1 terminals to the power management control ECU. The power management control ECU determines the charging and discharging amperage of the HV battery based on the received signals and calculates the SOC of the HV battery using the cumulative amperage value.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0ABF	123	When the battery current sensor is abnormal (1 trip detection)	Hybrid battery junction block assembly Battery smart unit Wire harness or connector HV battery
P0AC1
P0AC2
P0B10
P0B11

WIRING DIAGRAM

Refer to the wiring diagram for DTC U029A-123 Click here.

INSPECTION PROCEDURE

CAUTION:

Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly or electric vehicle charger assembly, turn the power switch off. Also, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly and electric vehicle charger assembly.
When disposing of HV batteries and hybrid vehicle supply stack sub-assemblies, make sure to return them through an authorized collection agent who is capable of handling them safely. If they are returned via the manufacturer specified route, they will be returned properly and in a safe manner by an authorized collection agent.
Before returning the HV battery, make sure to perform recovery inspection Click here.
Before returning the hybrid vehicle supply stack sub-assembly, make sure to perform recovery inspection Click here.
Make a note of the output DTCs as some of them may be necessary for recovery inspection of the HV battery and hybrid vehicle supply stack sub-assemblies.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

Tech Tips

If a short to +B occurs in the battery current sensor or intake air temperature sensor, the following DTCs may be output simultaneously.

DTC No.	Relevant Diagnosis
P0ABF-123	Hybrid Battery Pack Current Sensor Circuit
P0A9E-123	Hybrid Battery Temperature Sensor "A" Circuit High
P0AC8-123	Hybrid Battery Temperature Sensor "B" Circuit High
P0ACD-123	Hybrid Battery Temperature Sensor "C" Circuit High
P0AEB-123	Hybrid Battery Temperature Sensor "D" Circuit High
P0BC5-123	Hybrid Battery Temperature Sensor "E" Circuit High
P0C36-123	Hybrid Battery Temperature Sensor "F" Circuit High
P0AAF-123	Hybrid Battery Pack Air Temperature Sensor "A" Circuit High
P0AB4-123	Hybrid Battery Pack Air Temperature Sensor "B" Circuit High

PROCEDURE

CHECK DTC OUTPUT (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 Click here.

Result

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

Disconnect the GTS from the DLC3.

GO TO DTC CHART (P0AFC-123) Click here

CHECK HARNESS AND CONNECTOR (AM AND IGCT VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Remove the No. 1 hybrid battery intake duct Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*a	Component with harness connected (Battery Smart Unit)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
c5-6 (AM) - c5-9 (GND)	Power switch off	8.6 V or more
c5-12 (IGCT) - c5-9 (GND)	Power switch on (IG)	8.6 V or more

Note

Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Tech Tips

As there might be an intermittent malfunction in the battery smart unit power source circuit, inspect the following even if the measured voltage is as specified:

Installation condition of fuse(s) (before removing fuse(s)) (IGCT circuit)
Fuse condition (before and after removing fuse(s)) (IGCT circuit)
Connection condition of connectors (IGCT circuit)
Wire harness condition (IGCT circuit)
Wire harness condition (GND circuit)

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery intake duct.
Install the No. 1 hybrid vehicle battery shield panel.

CHECK POWER SOURCE CIRCUIT

CHECK HARNESS AND CONNECTOR (HYBRID BATTERY JUNCTION BLOCK ASSEMBLY - BATTERY SMART UNIT)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery intake duct Click here.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Disconnect only the c5 battery smart unit connector.
Disconnect the c6 battery current sensor connector from the hybrid battery junction block assembly.

Text in Illustration
*a	Rear view of wire harness connector (to Battery Smart Unit)
*b	Front view of wire harness connector (to Hybrid Battery Junction Block Assembly)

Measure the resistance according to the value(s) in the tables below.

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
c5-7 (IB1) - c6- 2 (IB1)	Power switch off	Below 1 Ω
c5-8 (GIB) - c6- 3 (GIB)	Power switch off	Below 1 Ω
c5-1 (IB0) - c6- 4 (IB0)	Power switch off	Below 1 Ω
c5-2 (VIB) - c6- 1 (VIB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
c5-7 (IB1) or c6- 2 (IB1) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-8 (GIB) or c6- 3 (GIB) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-1 (IB0) or c6- 4 (IB0) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-2 (VIB) or c6- 1 (VIB) - Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the c5 battery smart unit connector.
Reconnect the c6 battery current sensor connector to the hybrid battery junction block assembly.
Install the No. 1 hybrid battery intake duct.
Install the No. 1 hybrid vehicle battery shield panel.

REPAIR HARNESS OR CONNECTOR OR REPLACE HV BATTERY

CHECK BATTERY SMART UNIT (VIB VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Remove the No. 1 hybrid battery intake duct Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*a	Component with harness connected (Battery Smart Unit)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
c5-2 (VIB) - c5-8 (GIB)	Power switch on (IG)	4.6 to 5.4 V

Note

Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery intake duct.
Install the No. 1 hybrid vehicle battery shield panel.

REPLACE BATTERY SMART UNIT Click here

CHECK BATTERY SMART UNIT

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*a	Component with harness connected (Battery Smart Unit)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
c5-7 (IB1) - c5-8 (GIB)	Power switch on (IG)	2.16 to 2.24 V
c5-1 (IB0) - c5-8 (GIB)	Power switch on (IG)	2.76 to 2.84 V

Note

Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid vehicle battery shield panel.

REPLACE HYBRID BATTERY JUNCTION BLOCK ASSEMBLY Click here

REPLACE BATTERY SMART UNIT Click here