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 Circuit Low
P0AC2-123	Hybrid Battery Pack Current Sensor 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 charged, and above 2.5 V indicates that the HV battery is being discharged. The hybrid vehicle 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.	INF Code	DTC Detection Condition	Trouble Area
P0ABF	123	Power source voltage of the battery current sensor is excessively low/high. (1 trip detection logic)	Hybrid battery junction block assembly Battery smart unit Wire harness or connector
P0AC1	The battery current sensor output value is excessively low. (1 trip detection logic)
P0AC2	The battery current sensor output value is excessively high. (1 trip detection logic)

DTC No.

INF Code

DTC Detection Condition

Trouble Area

P0ABF

123

Power source voltage of the battery current sensor is excessively low/high.

(1 trip detection logic)

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

P0AC1

The battery current sensor output value is excessively low.

(1 trip detection logic)

P0AC2

The battery current sensor output value is excessively high.

(1 trip detection logic)

Related Data List
DTC No.	Data List
P0ABF-123 P0AC1-123 P0AC2-123	Batt Pack Current Val

WIRING DIAGRAM


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

Refer to the wiring diagram for DTC P0AFC-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

At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

After turning the ignition 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

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the ignition switch to ON (IG) and wait for 10 seconds or more.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the ignition switch to ON (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Check and record any HV system DTCs, INF codes and freeze frame data.

Read output DTCs Click here.

Result

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

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

GO TO DTC CHART (P0AFC-123) 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery exhaust duct Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch to 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	Switch Condition	Specified Condition
K32-3 (IGCT) - K32-6 (GND)	Ignition switch ON (IG)	11 to 14 V

Note

Turning the ignition switch to ON (IG) with the service plug 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 ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery exhaust duct.

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery shield sub-assembly Click here.
Remove the No. 2 hybrid battery shield sub-assembly Click here.
Disconnect only the X1 connector of the battery smart unit.
Disconnect the 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	Switch Condition	Specified Condition
X1-5 (IB) - X2-3 (IB)	Ignition switch off	Below 1 Ω
X1-12 (GIB) - X2-2 (GIB)	Ignition switch off	Below 1 Ω
X1-6 (VIB) - X2-1 (VIB)	Ignition switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
X1-5 (IB) or X2-3 (IB) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
X1-12 (GIB) or X2-2 (GIB) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
X1-6 (VIB) or X2-1 (VIB) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

Tech Tips

Because the battery harness is not available as a supply part, if the harness cannot be repaired, replace the HV battery assembly.

Connect the battery smart unit connector.
Connect the battery current sensor connector to the hybrid battery junction block assembly.
Install the No. 2 hybrid battery shield sub-assembly.
Install the No. 1 hybrid battery shield sub-assembly.

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery shield sub-assembly Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch to 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	Switch Condition	Specified Condition
X1-6 (VIB) - X1-12 (GIB)	Ignition switch ON (IG)	4.6 to 5.4 V

Note

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

Turn the ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery shield sub-assembly.

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery shield sub-assembly Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch to 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	Switch Condition	Specified Condition
X1-5 (IB) - X1-12 (GIB)	Ignition switch ON (IG)	2.46 to 2.54 V

Note

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

Turn the ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery shield sub-assembly.

REPLACE BATTERY SMART UNIT Click here

REPLACE HYBRID BATTERY JUNCTION BLOCK ASSEMBLY Click here