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 inlet air temperature sensor (battery) 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 inlet air temperature sensor are the same as those of the battery temperature sensor Click here. The battery voltage sensor uses signals from the inlet air temperature sensor to control the air volume of the battery cooling blower assembly.

DTC No.	DTC Detection Condition	Trouble Area
P0AAE-123	The inlet air temperature sensor output voltage is lower than the specified value (short circuit) and the detected temperature is higher than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0AAF-123	The inlet air temperature sensor output voltage is higher than the standard value (short to +B or open) and the detected temperature is lower than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector

Tech Tips

After checking for the above DTCs, check the hybrid system Data List item "Inhaling Air Temp" using the GTS.

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

Related Data List
DTC No.	Data List
P0AAE-123 P0AAF-123	Inhaling Air Temp

WIRING DIAGRAM

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

CAUTION / NOTICE / HINT

CAUTION:

Before inspecting the high-voltage system, 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 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.

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the power switch on (IG) and wait for 5 seconds or more.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Read output DTCs.

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 (P0AFC-123) Click here

CHECK CONNECTOR CONNECTION CONDITION (INLET AIR TEMPERATURE SENSOR)
CAUTION:

Be sure to wear insulated gloves and protective goggles.
1. 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.
2. Remove the upper hybrid battery cover sub-assembly Click here.
3. Visually check the installation condition of the inlet air temperature sensor.
  1. Check the connections of the z21 connector of the battery voltage sensor Click here.
    
    OK
    
    The connectors are connected securely and there are no contact problems.
4. Install the upper hybrid battery cover sub-assembly.
NG
CONNECT SECURELY

OK

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

CHECK INSTALLATION OF INLET AIR 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 No. 2 hybrid battery carrier bracket sub-assembly Click here.

Visually check the installation condition of the inlet air temperature sensor.

Result

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

Install the No. 2 hybrid battery carrier bracket sub-assembly.

REPLACE HV BATTERY Click here

INSTALL PARTS CORRECTLY

CHECK HV BATTERY (INLET 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 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.
Disconnect the z21 and m5 battery voltage sensor connectors.

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

Text in Illustration
*a	Rear view of wire harness connector (to Battery Voltage Sensor)	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition
z21-1 (TC0) - z21-7 (GC0)	0°C (32°F)	26.7 to 27.8 kΩ
z21-1 (TC0) - z21-7 (GC0)	25°C (77°F)	9.9 to 10.1 kΩ
z21-1 (TC0) - z21-7 (GC0)	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
z21-1 (TC0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-1 (TC0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-7 (GC0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-7 (GC0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-4 (TB0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-4 (TB0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-10 (GB0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-10 (GB0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-3 (TB1) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-3 (TB1) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-9 (GB1) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-9 (GB1) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-2 (TB2) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-2 (TB2) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-8 (GB2) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-8 (GB2) - m5-6 (GND)	Power switch off	10 kΩ or higher

Reconnect the z21 and m5 battery voltage sensor connectors.
Install the upper hybrid battery cover sub-assembly.

REPLACE BATTERY VOLTAGE SENSOR Click here

CHECK HARNESS AND CONNECTOR (INLET 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 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 and inlet air 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.

Tech Tips

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

Install the upper hybrid battery cover sub-assembly.

REPLACE HV BATTERY Click here

REPAIR HARNESS OR CONNECTOR (INLET AIR TEMPERATURE SENSOR)