P0ABF When the battery current sensor is abnormal (1 or 2 trip detection)

DESCRIPTION

1. The battery current sensor, which is mounted on the negative cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery smart unit inputs a voltage, which varies between 0 and 5 V in proportion to the amperage, into the 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 HV 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 P0AC1 P0AC2	When the battery current sensor is abnormal (1 or 2 trip detection)	HV relay assembly (battery current sensor) Battery smart unit Battery pack wire

MONITOR DESCRIPTION

If the battery smart unit detects a malfunction in the battery current sensor, the HV control ECU illuminates the MIL and sets a DTC.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AC0 (Click here)

INSPECTION PROCEDURE

CAUTION:

1. 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 reconnecting it while you are working on the high-voltage system.
   
2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
   

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

1. READ OUTPUT DTC (DTC P0A1F IS OUTPUT)

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to the ON position.

3. Select the following menu items: Powertrain / Hybrid Control / DTC.

4. Read output DTCs. (Click here)

   Result:

   DTC P0A1F is output.
   

YES	REPLACE BATTERY SMART UNIT

NO

2. CHECK BATTERY PACK WIRE (BATTERY SMART UNIT - BATTERY CURRENT SENSOR)

CAUTION:

Be sure to wear insulated gloves.

1. Remove the battery cover. (Click here)

2. Disconnect the B26 connector from the battery smart unit.

3. Disconnect the B25 HV relay assembly (battery current sensor) connector.

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

   Standard Resistance (Check for open):

   Tester Connection	Specified Condition
   IB1 (B26-11) - IB (B25-3)	Below 1 Ω
   GIB (B26-12) - GIB (B25-2)	Below 1 Ω
   VIB (B26-10) - VIB (B25-1)	Below 1 Ω

   Standard Resistance (Check for short):

   Tester Connection	Specified Condition
   IB1 (B26-11) or IB (B25-3) - Body ground	10 kΩ or higher
   GIB (B26-12) or GIB (B25-2) - Body Ground	10 kΩ or higher
   VIB (B26-10) or VIB (B25-1) - Body Ground	10 kΩ or higher

NG	REPLACE BATTERY PACK WIRE

OK

3. INSPECT BATTERY CURRENT SENSOR

1. Disconnect the B26 battery smart unit connector.

   NOTICE:

   Do not disconnect the HV relay assembly (battery current sensor) connector to check for a short in the battery current sensor by using terminals of the B26 connector (vehicle side) of the battery smart unit.

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

   Standard Resistance:

   Tester Connection	Specified Condition
   VIB (B26-10) - IB1 (B26-11)	100 Ω or more
   VIB (B26-10) - GIB (B26-12)	100 Ω or more
   IB1 (B26-11) - GIB (B26-12)	100 Ω or more

NG	REPLACE HV RELAY ASSEMBLY

OK

4. INSPECT BATTERY SMART UNIT

1. Disconnect the B26 battery smart unit connector.

2. Turn the ignition switch to the ON position.

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

   Standard Voltage:

   Tester Connection	Specified Condition
   VIB (B26-10) - GIB (B26-12)	4.6 to 5.4 V

   NOTICE:

   Turning the ignition switch to the ON position with the HV relay assembly (battery current sensor) connector disconnected causes DTC P0AC2 to be detected. Use the intelligent tester to clear the DTCs.

4. Reconnect the battery smart unit connector.

NG	REPLACE BATTERY SMART UNIT

OK

5. INSPECT BATTERY SMART UNIT

1. Disconnect the B25 battery current sensor connector from the HV relay assembly.

2. Turn the ignition switch to the ON position.

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

   Standard Voltage:

   Tester Connection	Specified Condition
   IB (B25-3) - GIB (B25-2)	4.6 to 5.4 V
   VIB (B25-1) - GIB (B25-2)	4.6 to 5.4 V

   NOTICE:

   Turning the ignition switch to the ON position with the HV relay assembly (battery current sensor) connector disconnected causes DTC P0AC2 to be detected. Use the intelligent tester to clear the DTCs.

4. Turn the ignition switch off.

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

   Standard Resistance:

   Tester Connection	Specified Condition
   VIB (B26-10) - IB1 (B26-11)	100 Ω or more

NG	REPLACE BATTERY SMART UNIT

OK
REPLACE HV RELAY ASSEMBLY