HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A9C-123, P0AC6-123, P0ACB-123, P0AE9-123, P0BC3-123, P0C34-123, P0C6E-123, P0C70-123, P0C72-123

DTC Code	DTC Name
P0A9C-123	Hybrid Battery Temperature Sensor "A" Range / Performance
P0AC6-123	Hybrid Battery Temperature Sensor "B" Range / Performance
P0ACB-123	Hybrid Battery Temperature Sensor "C" Range / Performance
P0AE9-123	Hybrid Battery Temperature Sensor "D" Range / Performance
P0BC3-123	Hybrid Battery Temperature Sensor "E" Range / Performance
P0C34-123	Hybrid Battery Temperature Sensor "F" Range / Performance
P0C6E-123	Hybrid Battery Temperature Sensor "A" / "B" Correlation
P0C70-123	Hybrid Battery Temperature Sensor "C" / "D" Correlation
P0C72-123	Hybrid Battery Temperature Sensor "E" / "F" Correlation

DESCRIPTION

The battery temperature sensors are provided at 6 locations on the bottom of the HV battery. The resistance of the thermistor, which is built into each battery temperature sensor, varies in accordance with changes in the HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery smart unit uses the battery temperature sensor to detect the HV battery temperature, and sends the detected value to the power management control ECU. Based on the results of this detection, the power management control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises above a predetermined level.)

Temperature Sensor Identification Cross Reference Table

DTC Title Sensor	Battery Temperature Sensor	Intelligent Tester Display
A	0	1
B	1	2
C	2	3
D	3	4
E	4	5
F	5	6

Tech Tips

For example, sensor A in the DTC title is battery temperature sensor (No. 0). This sensor is displayed as Temp of Batt TB1 in the Data List.

DTC No.	DTC Detection Condition	Trouble Area
P0A9C-123 P0AC6-123 P0ACB-123 P0AE9-123 P0BC3-123 P0C34-123 P0C6E-123 P0C70-123 P0C72-123	When the battery temperature sensor performance is abnormal (1 trip detection/2 trip detection)	HV battery assembly Battery smart unit Wire harness or connector

DTC No.

DTC Detection Condition

Trouble Area

P0A9C-123

P0AC6-123

P0ACB-123

P0AE9-123

P0BC3-123

P0C34-123

P0C6E-123

P0C70-123

P0C72-123

When the battery temperature sensor performance is abnormal (1 trip detection/2 trip detection)

HV battery assembly
Battery smart unit
Wire harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

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 disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals.

Tech Tips

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

Note

After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal
Specification	Waiting Time
w/o Telematics transceiver	60 sec.
w/ Telematics transceiver	120 sec.

PROCEDURE

CHECK DTC OUTPUT (DTC P0A1D-390 IS OUTPUT)

Connect the intelligent tester 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
P0A1D-390 is not output.	A
P0A1D-390 is also output.	B

Disconnect the intelligent tester from the DLC3.

GO TO DTC CHART

CHECK DTC OUTPUT (DTC P0AFC-123 IS OUTPUT)

Connect the intelligent tester 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 intelligent tester from the DLC3.

GO TO DTC CHART

CHECK INSTALLATION OF BATTERY TEMPERATURE SENSOR

CAUTION:

Be sure to wear insulated gloves and protective goggles.

Disconnect the cable from the negative (-) battery terminal.
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 battery cover Click here.

Remove the group of HV battery modules which includes the relevant battery temperature sensor.

Battery Temperature Sensor	HV Battery
Battery temperature sensor 0	HV battery RH
Battery temperature sensor 1	HV battery RH
Battery temperature sensor 2	HV battery CTR
Battery temperature sensor 3	HV battery CTR
Battery temperature sensor 4	HV battery LH
Battery temperature sensor 5	HV battery LH

Visually check the installation condition of the relevant battery temperature sensor.

Text in Illustration
*1	HV Battery RH	*2	HV Battery CTR
*3	HV Battery LH	*4	Module
*5	Battery Temperature Sensor	*6	Insulation Plate
*7	Claw	-	-

Standard Condition
The battery temperature sensor is installed in the correct location with the correct orientation and its claws are engaged securely.

Result

Result	Proceed to
The battery temperature sensor is installed in the correct location with the correct orientation and its claws are engaged securely	A
Claws are damaged.	B
Battery temperature sensor is not installed correctly, but claws are not damaged.	C

Note

Do not use a stick or similar object to push on the sensors when inspecting them. Doing so may result in damage to the sensors.

Install the HV battery Click here.
Install the battery cover.
Connect the cable to the negative (-) battery terminal.

REPLACE HV BATTERY ASSEMBLY Click here

INSTALL PARTS CORRECTLY

CHECK HV BATTERY ASSEMBLY (BATTERY TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

Disconnect the cable from the negative (-) battery terminal.
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 battery cover Click here.
Remove the battery smart unit.

Tech Tips

Disconnect the z29 and z30 connectors of the battery smart unit.

Text in Illustration
*1	Rear view of wire harness connector (to Battery Smart Unit)

Measure the resistance of the circuit for the malfunctioning sensor (battery temperature sensor 0 to 5).

Tester Connection
Tester Connection	Battery Temperature Sensor No.
z29-7 (TB0) - z29-17 (GB0)	0
z29-6 (TB1) - z29-16 (GB1)	1
z29-5 (TB2) - z29-15 (GB2)	2
z29-4 (TB3) - z29-14 (GB3)	3
z29-3 (TB4) - z29-13 (GB4)	4
z29-2 (TB5) - z29-12 (GB5)	5

Standard Resistance
Thermistor Temperature	Switch Condition	Specified Condition
0°C (32°F)	Power switch off	27.3 to 28.4 kΩ
25°C (77°F)	Power switch off	9.9 to 10.1 kΩ
40°C (104°F)	Power switch off	5.72 to 5.90 kΩ

Text in Illustration
*1	Rear view of wire harness connector (to Battery Smart Unit)

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

Standard Resistance

Tester Connection	Switch Condition	Standard Resistance
z29-7 (TB0) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-7 (TB0) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-17 (GB0) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-17 (GB0) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-6 (TB1) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-6 (TB1) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-16 (GB1) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-16 (GB1) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-5 (TB2) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-5 (TB2) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-15 (GB2) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-15 (GB2) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-4 (TB3) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-4 (TB3) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-14 (GB3) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-14 (GB3) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-3 (TB4) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-3 (TB4) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-13 (GB4) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-13 (GB4) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-2 (TB5) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-2 (TB5) - z30-5 (GND)	Power switch off	10 kΩ or more
z29-12 (GB5) - z30-1 (IGCT)	Power switch off	10 kΩ or more
z29-12 (GB5) - z30-5 (GND)	Power switch off	10 kΩ or more

Install the battery smart unit Click here.
Install the battery cover.
Connect the cable to the negative (-) battery terminal.

Click here

REPLACE BATTERY SMART UNIT Click here

CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

Disconnect the cable from the negative (-) battery terminal.
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 battery cover Click here.
Remove the group of HV battery modules which includes the malfunctioning battery temperature sensor.

Turn the group of HV battery modules over. Check the wire harness and connectors of the battery temperature sensor for abnormalities by sight and touch.

Specified Condition
There are no open or short circuits in the wire harness and connectors. There are no short circuits to other wire harnesses.

REPAIR HARNESS OR CONNECTOR

REPLACE HV BATTERY ASSEMBLY Click here