DTC    P0AAE-123    Hybrid Battery Pack Air Temperature Sensor "A" Circuit Low

DTC    P0AAF-123    Hybrid Battery Pack Air Temperature Sensor "A" Circuit High

for Preparation Click here


DESCRIPTION

  1. 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 smart unit 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
P0AAF-123
When the temperature indicated by the inlet air temperature sensor is lower than a predetermined limit (open circuit) or is higher than a predetermined limit (short circuit)
  1. HV battery
  2. Battery smart unit
  3. Wire harness or connector
  4. Hybrid battery junction block assembly

HINT:
After confirming that DTC P0AAE-123 or P0AAF-123 is output, use the intelligent tester to check "Inhaling Air Temp" in the HV ECU data list.


Displayed Temperature
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).

INSPECTION PROCEDURE

CAUTION:
  1. 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.
  2. 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).

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

NOTICE:
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).

1.CHECK DTC OUTPUT (HV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / DTC.

  1. Check if DTCs are output.

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

  1. Turn the power switch off.



B
GO TO DTC CHART (Click here)
A


2.CHECK INSTALLATION OF INLET AIR TEMPERATURE SENSOR

CAUTION:
Be sure to wear insulated gloves.

  1. Check that the service plug grip is not installed.

    NOTICE:
    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.



  1. Check installation of inlet air temperature sensor



      A217836E15

    1. Check the connections of connector z10 of the battery smart unit.

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

      Result:
      Result
      		Proceed to
      NG
      		B
      OK
      		Go to next step



      2. A219389

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

      OK:
      The inlet air temperature sensor is installed in the correct location and its claws are engaged securely.

      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.
      		C
      Inlet air temperature sensor is not installed correctly, but claws are not damaged.
      		D



B
CONNECT SECURELY

C
REPLACE HV BATTERY (Click here)

D
INSTALL PARTS CORRECTLY
A


3.CHECK HV BATTERY (INLET AIR TEMPERATURE SENSOR AND BATTERY TEMPERATURE SENSOR)

CAUTION:
Be sure to wear insulated gloves.

  1. Check that the service plug grip is not installed.

    NOTICE:
    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.



    A217836E14

  1. Disconnect connectors i1 and z10 from the battery smart unit.



    A216735E10

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z10-1 (TCO) - z10-7 (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

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

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    z10-1 (TCO) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-1 (TCO) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-7 (GCO) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-7 (GCO) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    z10-6 (TBO) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-6 (TBO) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-12 (GBO) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-12 (GBO) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-5 (TB1) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-5 (TB1) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-11 (GB1) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-11 (GB1) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-4 (TB2) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-4 (TB2) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher
    z10-10 (GB2) - i1-4 (IGCT)
    		Power switch off
    		10 kΩ or higher
    z10-10 (GB2) - i1-8 (GND)
    		Power switch off
    		10 kΩ or higher

  1. Connect the battery smart unit connectors.



NG
Go to step 4
OK

REPLACE BATTERY SMART UNIT (Click here)  

4.CHECK HARNESS AND CONNECTOR (INLET AIR TEMPERATURE SENSOR AND BATTERY TEMPERATURE SENSOR)

CAUTION:
Be sure to wear insulated gloves and protective goggles.

  1. Check that the service plug grip is not installed.

    NOTICE:
    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.



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


    A241554

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



NG
REPAIR HARNESS OR CONNECTOR
OK

REPLACE HV BATTERY (Click here)