HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A9C-123, P0AC6-123, P0ACB-123, P3065-123

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
P3065-123	Hybrid Battery Temperature Sensor Range/Performance Stuck "A"

DESCRIPTION

The battery temperature sensors are provided at 3 locations 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 sensors 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

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 P3065-123	When the battery temperature sensor performance is abnormal (1 trip detection/2 trip detection)	Hybrid battery thermistor Battery smart unit Wire harness or connector

DTC No.

DTC Detection Condition

Trouble Area

P0A9C-123

P0AC6-123

P0ACB-123

P3065-123

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

Hybrid battery thermistor
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 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.

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 / Trouble Codes.

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 INSTALLATION OF BATTERY TEMPERATURE SENSOR

CAUTION:

Be sure to wear insulated gloves and protective goggles.

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 upper hybrid battery cover sub-assembly Click here.

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

Text in Illustration
*1	Battery Temperature Sensor 0	*2	Battery Temperature Sensor 1
*3	Battery Temperature Sensor 2	-	-

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

Result

Result	Proceed to
Each battery temperature sensor is installed in the correct location with the correct orientation and its claws are engaged securely.	A
Claws are damaged.	B
Any of battery temperature sensors are 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 upper hybrid battery cover sub-assembly Click here.

REPLACE HYBRID BATTERY THERMISTOR Click here

INSTALL PARTS CORRECTLY

CHECK HYBRID BATTERY THERMISTOR (BATTERY TEMPERATURE SENSOR)

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.
Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.
Disconnect connectors z5 and d1 from the battery smart unit.

Text in Illustration
*a	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 2).

Tester Connection
Tester Connection	Battery Temperature Sensor No.
z5-6 (TB0) - z5-12 (GB0)	0
z5-5 (TB1) - z5-11 (GB1)	1
z5-4 (TB2) - z5-10 (GB2)	2

Standard Resistance
Thermistor Temperature	Switch Condition	Specified Condition
0°C (32°F)	Power switch off	26.7 to 27.8 kΩ
25°C (77°F)	Power switch off	9.9 to 10.1 kΩ
40°C (104°F)	Power switch off	5.73 to 5.92 kΩ

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

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

Standard Resistance

Tester Connection	Switch Condition	Standard Resistance
z5-6 (TB0) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-6 (TB0) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-12 (GB0) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-12 (GB0) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-5 (TB1) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-5 (TB1) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-11 (GB1) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-11 (GB1) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-4 (TB2) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-4 (TB2) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-10 (GB2) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-10 (GB2) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-1 (TC0) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-1 (TC0) - d1-8 (GND)	Power switch off	10 kΩ or higher
z5-7 (GC0) - d1-4 (IGCT)	Power switch off	10 kΩ or higher
z5-7 (GC0) - d1-8 (GND)	Power switch off	10 kΩ or higher

Connect the battery smart unit connectors.
Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR) 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.

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 upper hybrid battery cover sub-assembly Click here.

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.

Install the upper hybrid battery cover sub-assembly Click here.

REPAIR HARNESS OR CONNECTOR

REPLACE HYBRID BATTERY THERMISTOR Click here