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


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)

  • Hybrid battery thermistor

  • Battery smart unit

  • Wire harness or connector

  • Hybrid battery junction block

Tech Tips

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 P0A9D-123 Click here.

INSPECTION PROCEDURE

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.

    Tech Tips

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

Note

After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal.

PROCEDURE


  1. CHECK FOR DTCS (DTC P0AFC-123 IS OUTPUT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read output DTCs Click here.

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

    5. Disconnect the intelligent tester from the DLC3.


    B

    GO TO DTC CHART

    A

  2. CHECK INSTALLATION OF INLET AIR TEMPERATURE SENSOR

    CAUTION:

    Be sure to wear insulated gloves and protective goggles.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. Check installation of inlet air temperature sensor


      1. Check the connections of the z17 connector of the battery smart unit.

        A01J9DNE06
        OK
        The connectors are connected securely and there are no contact problems.
        Result
        Result Proceed to
        NG B
        OK Go to next step
        Text in Illustration
        *1 Battery Smart Unit

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

        A01JCLH
        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

    5. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    6. Connect the cable to the negative (-) battery terminal.


    B

    CONNECT SECURELY

    C

    REPLACE HYBRID BATTERY THERMISTOR Click here

    D

    INSTALL PARTS CORRECTLY

    A

  3. CHECK HYBRID BATTERY THERMISTOR (INLET AIR TEMPERATURE SENSOR AND BATTERY TEMPERATURE SENSOR)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. A01J9DNE01

      Disconnect the c1 and z17 connectors from the battery smart unit.

    5. A01JBDME01
      Text in Illustration
      *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
      z17-1 (TC0) - z17-7 (GC0) 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

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      z17-1 (TC0) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-1 (TC0) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-7 (GC0) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-7 (GC0) - c1-8 (GND) Power switch off 10 kΩ or higher

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      z17-6 (TB0) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-6 (TB0) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-12 (GB0) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-12 (GB0) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-5 (TB1) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-5 (TB1) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-11 (GB1) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-11 (GB1) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-4 (TB2) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-4 (TB2) - c1-8 (GND) Power switch off 10 kΩ or higher
      z17-10 (GB2) - c1-4 (IGCT) Power switch off 10 kΩ or higher
      z17-10 (GB2) - c1-8 (GND) Power switch off 10 kΩ or higher

    8. Connect the c1 and z17 connectors to the battery smart unit.

    9. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    10. Connect the cable to the negative (-) battery terminal.


    NG

    Click here

    OK

  4. CHECK BATTERY SMART UNIT (VIB VOLTAGE)

    Note

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. Connect the cable to the negative (-) battery terminal.

    5. Turn the power switch on (IG).

      Note

      Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set. Use the intelligent tester to clear the DTCs Click here.

    6. A01JBYOE01
      Text in Illustration
      *1

      Component with harness connected

      (Battery Smart Unit)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c1-5 (VIB) - c1-6 (GIB) Power switch on (IG) 4.6 to 5.4 V

    7. Turn the power switch off.

    8. Disconnect the cable from the negative (-) battery terminal.

    9. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    10. Connect the cable to the negative (-) battery terminal.


    NG

    Click here

    OK

    REPLACE BATTERY SMART UNIT Click here

  5. CHECK HYBRID BATTERY JUNCTION BLOCK

    Note

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. Disconnect the c4 battery current sensor connector from the hybrid battery junction block.

    5. Connect the cable to the negative (-) battery terminal.

    6. Turn the power switch on (IG).

      Note

      Turning the power switch on (IG) with the HV relay assembly (battery current sensor) connector disconnected causes DTC P0AC2-123 to be set. Use the intelligent tester to clear the DTCs Click here.

    7. A01JBQLE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Hybrid Battery Junction Block)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c4-1 (VIB) - c4-2 (GIB) Power switch on (IG) 4.6 to 5.4 V

    8. Turn the power switch off.

    9. Connect the c4 battery current sensor connector to the hybrid battery junction block.

    10. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.


    NG

    Click here

    OK

    REPLACE HYBRID BATTERY JUNCTION BLOCK Click here

  6. CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - HYBRID BATTERY JUNCTION BLOCK)

    Note

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. A01J9DNE03

      Disconnect only the c1 connector of the battery smart unit.

    5. Disconnect the c4 battery current sensor connector from the hybrid battery junction block.

    6. A01J8EXE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Battery Smart Unit)
      *2

      Front view of wire harness connector

      (to Hybrid Battery Junction Block)

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      c1-1 (IB) - c4-3 (IB) Power switch off Below 1 Ω
      c1-6 (GIB) - c4-2 (GIB) Power switch off Below 1 Ω
      c1-5 (VIB) - c4-1 (VIB) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      c1-1 (IB) or c4-3 (IB) - Body ground and other terminals Power switch off 10 kΩ or higher
      c1-6 (GIB) or c4-2 (GIB) - Body ground and other terminals Power switch off 10 kΩ or higher
      c1-5 (VIB) or c4-1 (VIB) - Body ground and other terminals Power switch off 10 kΩ or higher

    7. Connect the c1 connector to the battery smart unit.

    8. Connect the c4 battery current sensor connector to the hybrid battery junction block.

    9. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    10. Connect the cable to the negative (-) battery terminal.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BATTERY SMART UNIT Click here

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

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the upper hybrid battery cover sub-assembly Click here.

    4. 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.

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

    6. Connect the cable to the negative (-) battery terminal.


    NG

    REPAIR HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID BATTERY THERMISTOR Click here