Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground (P0ABF11,P0ABF15,P1CBB12,P1CBB14)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground (P0ABF11,P0ABF15,P1CBB12,P1CBB14)

DESCRIPTION

A battery current sensor is installed to the positive (+) terminal side of the HV battery and detects current flowing from the HV battery. The battery current sensor outputs voltage, which changes between 0 and 5 V according to the detected amperage, to the IB0 terminal of the battery voltage sensor. The battery voltage sensor sends signals to the hybrid vehicle control ECU. The hybrid vehicle control ECU determines the charging and discharging amount of the HV battery based on the received signals and calculates the SOC of the HV battery through the accumulated amperage.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0ABF11	Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground	The battery current sensor output voltage is excessively low. (1 trip detection logic)	Battery voltage sensor HV battery junction block assembly Wire harness or connector	Comes on	Master Warning Light: Comes on
P0ABF15	Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open	The battery current sensor output voltage is excessively high. (1 trip detection logic)	Battery voltage sensor HV battery junction block assembly Wire harness or connector	Comes on	Master Warning Light: Comes on
P1CBB12	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery	Power source voltage of the battery current sensor is excessively high. (1 trip detection logic)	Battery voltage sensor HV battery junction block assembly Wire harness or connector	Comes on	Master Warning Light: Comes on
P1CBB14	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open	Power source voltage of the battery current sensor is excessively low. (1 trip detection logic)	Battery voltage sensor HV battery junction block assembly Wire harness or connector	Comes on	Master Warning Light: Comes on

Related Data List

DTC No.	Data List
P0ABF11	Hybrid Battery Current*1
P0ABF15
P1CBB12
P1CBB14

HINT:

*1: The value of "Hybrid Battery Current" will be approximately 0 A when the power switch is on (IG) (READY off).

MONITOR DESCRIPTION

If the battery voltage sensor detects a malfunction in the battery current sensor, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0AC1 (INF P0ABF11): Current sensor circuit malfunction (GND short) P0AC2 (INF P0ABF15): Current sensor circuit malfunction (open) P1CBD (INF P1CBB12): Power supply circuit for current sensor malfunction (+B short) P1CBC (INF P1CBB14): Power supply circuit for current sensor malfunction (GND short)
Required sensors/components	Battery current sensor
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	Immediately
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

Battery voltage sensor

DTC P0AC1 (INF P0ABF11) is not detected

DTC P0AC2 (INF P0ABF15) is not detected

DTC P1CBD (INF P1CBB12) is not detected

DTC P1CBC (INF P1CBB14) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
With power switch on (IG) and wait for 10 seconds or more.[*1]
HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AFC00.

Click here

CAUTION / NOTICE / HINT

CAUTION:

Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
After removing the service plug grip from the HV battery, 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

HINT:

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

*a

Without waiting for 10 minutes

NOTICE:

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

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P0AFC00, P0AFC96 or P308A12 is not output.	A
P0AFC00, P0AFC96 or P308A12 is output.	B

(e) Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

2.	CHECK BATTERY VOLTAGE SENSOR (IGCT VOLTAGE)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR POWER SOURCE CIRCUIT)

3.	CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - HV BATTERY JUNCTION BLOCK ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(d) Remove the No. 1 hybrid battery exhaust duct.

Click here

(e) Disconnect the y6 battery voltage sensor connector.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
y6-5 (IB0) - y7-4 (IB0)	Power switch off	Below 1 Ω
y6-12 (GIB) - y7-3 (GIB)	Power switch off	Below 1 Ω
y6-6 (VIB) - y7-1 (VIB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
y6-5 (IB0) or y7-4 (IB0) - Body ground and other terminals	Power switch off	10 kΩ or higher
y6-12 (GIB) or y7-3 (GIB) - Body ground and other terminals	Power switch off	10 kΩ or higher
y6-6 (VIB) or y7-1 (VIB) - Body ground and other terminals	Power switch off	10 kΩ or higher

HINT:

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

Rear view of wire harness connector

(to Battery Voltage Sensor)

Front view of wire harness connector

(to HV Battery Junction Block Assembly (Battery Current Sensor))

(g) Reconnect the y6 battery voltage sensor connector.

(h) Install the No. 1 hybrid battery exhaust duct.

(i) Reconnect the y7 battery current sensor connector.

(j) Install the No. 1 HV battery cover panel RH.

REPLACE HYBRID BATTERY THERMISTOR

4.	CHECK BATTERY VOLTAGE SENSOR (VIB VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here

(d) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
y6-6 (VIB) - y6-12 (GIB)	Power switch on (IG)	4.6 to 5.4 V

NOTICE:

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

*a	Component with harness connected (Battery Voltage Sensor)

(f) Turn the power switch off.

(g) Disconnect the cable from the negative (-) auxiliary battery terminal.

(h) Install the No. 1 hybrid battery exhaust duct.

GO TO STEP 9

5.	CHECK BATTERY VOLTAGE SENSOR (GIB - GND)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
y6-12 (GIB) - K17-5 (GND)	Power switch off	Below 1 Ω

*a	Component without harness connected (Battery Voltage Sensor)

(e) Reconnect the y6 and K17 battery voltage sensor connectors.

(f) Install the No. 1 hybrid battery exhaust duct.

REPLACE BATTERY VOLTAGE SENSOR

6.	CHECK BATTERY VOLTAGE SENSOR (BATTERY CURRENT SENSOR OUTPUT VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here

(d) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
y6-5 (IB0) - y6-12 (GIB)	Power switch on (IG)	2.46 to 2.54 V

NOTICE:

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

*a	Component with harness connected (Battery Voltage Sensor)

(f) Turn the power switch off.

(g) Disconnect the cable from the negative (-) auxiliary battery terminal.

(h) Install the No. 1 hybrid battery exhaust duct.

Result	Proceed to
OK	A
NG(Voltage is outside the specified value and 0.4 V or more.)	B
NG(Voltage is outside the specified value and less than 0.4 V.)	C

REPLACE BATTERY VOLTAGE SENSOR

GO TO STEP 8

7.	CHECK BATTERY VOLTAGE SENSOR (VIB - IB0)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Tester Connection	Condition
y6-6 (VIB) - y6-5 (IB0)	Power switch off

*a	Component without harness connected (Battery Voltage Sensor)

(e) Reconnect the y6 battery voltage sensor connector.

(f) Install the No. 1 hybrid battery exhaust duct.

Result	Proceed to
Below 1 Ω	A
Other than above	B

REPLACE BATTERY VOLTAGE SENSOR

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

8.	CHECK BATTERY VOLTAGE SENSOR (BATTERY CURRENT SENSOR OUTPUT VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(d) Remove the No. 1 hybrid battery exhaust duct.

Click here

(e) Connect the cable to the negative (-) auxiliary battery terminal.

(f) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
y6-5 (IB0) - y6-12 (GIB)	Power switch on (IG)	4.6 to 5.4 V

NOTICE:

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

*a	Component with harness connected (Battery Voltage Sensor)

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

(j) Install the No. 1 hybrid battery exhaust duct.

(k) Reconnect the y7 battery current sensor connector.

(l) Install the No. 1 HV battery cover panel RH.

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

REPLACE BATTERY VOLTAGE SENSOR

9.	CHECK BATTERY VOLTAGE SENSOR (VIB VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

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.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(d) Remove the No. 1 hybrid battery exhaust duct.

Click here

(e) Connect the cable to the negative (-) auxiliary battery terminal.

(f) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
y6-6 (VIB) - y6-12 (GIB)	Power switch on (IG)	4.6 to 5.4 V

NOTICE:

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

*a	Component with harness connected (Battery Voltage Sensor)

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

(j) Install the No. 1 hybrid battery exhaust duct.

(k) Reconnect the y7 battery current sensor connector.

(l) Install the No. 1 HV battery cover panel RH.

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

REPLACE BATTERY VOLTAGE SENSOR

Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range (P0ABF2A)

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