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

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

DESCRIPTION

The battery current sensor, which is mounted on the positive cable side of the HV battery, detects the amperage that flows into the HV battery. The battery smart unit receives a voltage, which varies between 0 and 5 V in proportion to the amperage, at its IB terminal from the battery current sensor. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery is being discharged, and above 2.5 V indicates that the HV battery is being charged. The power management control ECU determines the charging and discharging amperage of the HV battery based on the signals that are input to its IB terminal from the battery smart unit, and calculates the SOC (state of charge) of the HV battery through the accumulated amperage.

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

DTC No.

DTC Detection Condition

Trouble Area

P0ABF-123

P0AC1-123

P0AC2-123

When the battery current sensor is abnormal (1 trip detection)

Hybrid battery junction block assembly
Battery smart unit
Wire harness or connector

WIRING DIAGRAM


*a	i4 Battery Current Sensor
*b	i1 Battery Smart Unit
*c	(Hybrid Battery Junction Block Assembly)

Tech Tips

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

CAUTION / NOTICE / HINT

CAUTION:

Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. 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.

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.

PROCEDURE

CHECK DTC OUTPUT (HV)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / DTC.

Check if DTCs are output.

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 Click here

CHECK BATTERY SMART UNIT (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.
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
i1-4 (IGCT) - i1-8 (GND)	Power switch on (IG)	11 to 14 V

Note

Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set. Use the intelligent tester to clear the DTCs Click here.

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.

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY SMART UNIT POWER SOURCE CIRCUIT)

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

Note

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.
Disconnect connector i1 from the battery smart unit.
Disconnect connector i4 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	Switch Condition	Specified Condition
i1-1 (IB) - i4-3 (IB)	Power switch off	Below 1 Ω
i1-6 (GIB) - i4-2 (GIB)	Power switch off	Below 1 Ω
i1-5 (VIB) - i4-1 (VIB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
i1-1 (IB) or i4-3 (IB) - Body ground and other terminals	Power switch off	10 kΩ or higher
i1-6 (GIB) or i4-2 (GIB) - Body ground and other terminals	Power switch off	10 kΩ or higher
i1-5 (VIB) or i4-1 (VIB) - Body ground and other terminals	Power switch off	10 kΩ or higher

Connect the battery smart unit connector.
Connect the hybrid battery junction block assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK BATTERY SMART UNIT (VIB VOLTAGE)

Note

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.
Turn the power switch on (IG).

Note

Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC to be set. Use the intelligent tester to clear the DTCs Click here.

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	Switch Condition	Specified Condition
i1-5 (VIB) - i1-6 (GIB)	Power switch on (IG)	4.6 to 5.4 V

Turn the power switch off.

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.
Turn the power switch on (IG).

Note

Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC to be set. Use the intelligent tester to clear the DTCs Click here.

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	Switch Condition	Specified Condition
i1-1 (IB) - i1-6 (GIB)	Power switch on (IG)	2.46 to 2.54 V

Turn the power switch off.

REPLACE BATTERY SMART UNIT Click here

REPLACE HYBRID BATTERY JUNCTION BLOCK ASSEMBLY Click here