HYBRID BATTERY SYSTEM, Diagnostic DTC:P0AAE-123, P0AAF-123

DTC Code	DTC Name
P0AAE-123	Hybrid Battery Pack Air Temperature Sensor "A" Circuit Low
P0AAF-123	Hybrid Battery Pack Air Temperature Sensor "A" Circuit High

DESCRIPTION

The HV battery intake air temperature sensor is mounted on the HV battery. The resistance of the sensor varies in accordance with changes in the intake air temperature. The characteristics of the HV battery intake air temperature sensor are the same as those of the HV battery temperature sensor Click here. The battery smart unit uses signals from the HV battery intake air temperature sensor to control the air volume of the battery cooling blower assembly.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0AAE P0AAF	123	When the temperature indicated by the HV battery intake air temperature sensor is lower than a predetermined limit (open circuit) or is higher than a predetermined limit (short circuit)	HV battery Battery smart unit Wire harness or connector

DTC No.

INF Code

DTC Detection Condition

Trouble Area

P0AAE

P0AAF

123

When the temperature indicated by the HV battery intake air temperature sensor is lower than a predetermined limit (open circuit) or is higher than a predetermined limit (short circuit)

HV battery
Battery smart unit
Wire harness or connector

Tech Tips

After confirming that DTC P0AAE-123 or P0AAF-123 is output, use the GTS to check "Inhaling Air Temp" in the hybrid vehicle control system data list.

Temperature Displayed	Malfunction
-45°C (-49°F) or less	Open or +B short circuit
95°C (203°F) or more	GND short

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A9C-123 Click here.

CAUTION / NOTICE / HINT

CAUTION:

Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, turn the ignition switch off and take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. 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.
When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.

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.

PROCEDURE

CHECK FOR DTCS (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the ignition switch to 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

Turn the ignition switch off.

GO TO DTC CHART (P0AFC-123) Click here

CHECK CONNECTOR CONNECTION CONDITION
CAUTION:

Be sure to wear insulated gloves.
1. 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.
2. Remove the No. 1 hybrid battery shield sub-assembly Click here.
3. Check the connections of the battery smart unit connector.
  
  OK
  
  The connectors are connected securely and there are no contact problems.
4. Install the No. 1 hybrid battery shield sub-assembly.
NG
CONNECT SECURELY

OK

OK
The connectors are connected securely and there are no contact problems.

CHECK INSTALLATION OF HV BATTERY INTAKE AIR 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 2 hybrid battery shield sub-assembly Click here.

Visually check the installation condition of the HV battery intake air temperature sensor.

OK
The HV battery intake air temperature sensor is installed in the correct location and its claws are engaged securely.

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

Install the No. 2 hybrid battery shield sub-assembly.

REPLACE HV BATTERY Click here

INSTALL PARTS CORRECTLY

CHECK HV BATTERY (HV BATTERY INTAKE AIR TEMPERATURE SENSOR AND HV 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 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.
Disconnect the battery smart unit connectors.

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	Condition	Specified Condition
X1-1 (TCO) - X1-7 (GCO)	0°C (32°F)	26.7 to 27.8 kΩ
	25°C (77°F)	9.9 to 10.1 kΩ
	40°C (104°F)	5.73 to 5.92 kΩ

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
X1-1 (TCO) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-1 (TCO) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-7 (GCO) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-7 (GCO) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-4 (TBO) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-4 (TBO) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-10 (GBO) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-10 (GBO) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-3 (TB1) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-3 (TB1) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-9 (GB1) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-9 (GB1) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-2 (TB2) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-2 (TB2) - K32-6 (GND)	Ignition switch off	10 kΩ or higher
X1-8 (GB2) - K32-3 (IGCT)	Ignition switch off	10 kΩ or higher
X1-8 (GB2) - K32-6 (GND)	Ignition switch off	10 kΩ or higher

Connect the battery smart unit connectors.
Install the No. 1 hybrid battery shield sub-assembly.

REPLACE BATTERY SMART UNIT Click here

CHECK HARNESS AND CONNECTOR (HV BATTERY INTAKE AIR TEMPERATURE SENSOR AND HV BATTERY TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves and protective goggle.

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 upper hybrid battery cover sub-assembly Click here.

Check the wire harness and connectors of the HV battery temperature sensor and HV battery intake air temperature sensor for abnormalities by sight and touch.

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

Tech Tips

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

Install the upper hybrid battery cover sub-assembly.

REPLACE HV BATTERY Click here

REPAIR HARNESS OR CONNECTOR (HV BATTERY INTAKE AIR TEMPERATURE SENSOR AND HV BATTERY TEMPERATURE SENSOR)