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 intake 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 intake air temperature sensor are the same as those of the battery temperature sensors. (For details, Click here.) The battery smart unit uses signals from the intake air temperature sensor to control the air volume of the battery cooling blower assembly.

DTC Code	DTC Detection Condition	Trouble Area
P0AAE-123	When the temperature indicated by the intake air temperature sensor is 95°C (203°F) or more (short to GND).	Harness or connector HV battery (Intake air temperature sensor) Battery smart unit
P0AAF-123	When the temperature indicated by the intake air temperature sensor is -45°C (-49°F) or less (open circuit or short to +B).

Tech Tips

After confirming that DTCs P0AAE-123 and P0AAF-123 are output, use the intelligent tester to check "Inhaling Air Temp" in the hybrid control system data list.

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

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A9D-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 disconnecting 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.

Tech Tips

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

PROCEDURE

CHECK FOR DTCS (DTC P0AFC-123 IS OUTPUT)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result
Result	Proceed to
P0AFC-123 is not output.	A
P0AFC-123 is output.	B

GO TO DTC (P0AFC-123) Click here

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

Be sure to wear insulated gloves.
1. Remove the HV battery Click here.
2. Check the connection of the intake air temperature sensor connector (intermediate connector).
  
  OK
  
  The connector is connected securely and there are no contact problems.
NG
CONNECT SECURELY

OK
CHECK CONNECTOR CONNECTION CONDITION (BATTERY SMART UNIT)
CAUTION:

Be sure to wear insulated gloves.
1. Check the connection of connector z87 of the battery smart unit.
  
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Tech Tips
  
  For the removal and installation procedures related to the battery smart unit connector inspection, Click here.
NG
CONNECT SECURELY

OK

OK
The connector is connected securely and there are no contact problems.

OK
The connector is connected securely and there are no contact problems.

CHECK HV BATTERY (INTAKE AIR TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves.

*1 Rear view of wire harness connector: (to Battery Smart Unit)

Disconnect the z87 battery smart unit connector.

Tech Tips

For the removal and installation procedures related to the battery smart unit connector inspection, Click here.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
z87-1 (TC0) - z87-11 (GC0)	Thermistor temperature: 0°C (32°F)	27.3 to 28.4 kΩ
z87-1 (TC0) - z87-11 (GC0)	Thermistor temperature: 25°C (77°F)	9.9 to 10.1 kΩ
z87-1 (TC0) - z87-11 (GC0)	Thermistor temperature: 40°C (104°F)	5.72 to 5.90 kΩ

Disconnect the z36 battery smart unit connector.


*1	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
z87-7 (TB0) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-7 (TB0) - z36-5 (GND)	Always	10 kΩ or higher
z87-6 (TB1) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-6 (TB1) - z36-5 (GND)	Always	10 kΩ or higher
z87-5 (TB2) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-5 (TB2) - z36-5 (GND)	Always	10 kΩ or higher
z87-4 (TB3) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-4 (TB3) - z36-5 (GND)	Always	10 kΩ or higher
z87-3 (TB4) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-3 (TB4) - z36-5 (GND)	Always	10 kΩ or higher
z87-2 (TB5) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-2 (TB5) - z36-5 (GND)	Always	10 kΩ or higher


*1	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
z87-1 (TC0) - z36-1 (IGCT)	Always	10 kΩ or higher
z87-1 (TC0) - z36-5 (GND)	Always	10 kΩ or higher

REPLACE BATTERY SMART UNIT Click here

CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - INTAKE AIR TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves.

Disconnect the A battery temperature sensor connector.


*1	HV Battery Side
*2	Battery Smart Unit Side

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

Standard Resistance

Tester Connection	Condition	Specified Condition
z87-7 (TB0) - A-2	Always	Below 1 Ω
z87-6 (TB1) - A-3	Always	Below 1 Ω
z87-5 (TB2) - A-4	Always	Below 1 Ω
z87-1 (TC0) - A-1	Always	Below 1 Ω
z87-17 (GB0) - A-6	Always	Below 1 Ω
z87-16 (GB1) - A-7	Always	Below 1 Ω
z87-15 (GB2) - A-8	Always	Below 1 Ω
z87-11 (GC0) - A-5	Always	Below 1 Ω

Standard Resistance

Tester Connection	Condition	Specified Condition
z87-7 (TB0) - Body ground and other terminals	Always	10 kΩ or higher
z87-6 (TB1) - Body ground and other terminals	Always	10 kΩ or higher
z87-5 (TB2) - Body ground and other terminals	Always	10 kΩ or higher
z87-1 (TC0) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE HV BATTERY Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR