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HYBRID BATTERY SYSTEM, Diagnostic DTC:P0AAC11, P0AAC15

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DTC Code DTC Name
P0AAC11 Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Ground
P0AAC15 Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Auxiliary Battery or Open
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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 battery temperature sensors (Click here). The battery ECU assembly uses signals from the HV battery intake air temperature sensor to control the air volume of the battery cooling blower assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0AAC11 Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Ground

The HV battery intake 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)

  • No.2 HV battery pack wire(HV battery intake air temperature sensor)

  • Battery ECU assembly

  • Wire harness or connector

  • HV battery junction block assembly

 Does not come on

Master Warning Light:

Comes on
P0AAC15 Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Auxiliary Battery or Open

The HV battery intake 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)

  • No.2 HV battery pack wire(HV battery intake air temperature sensor)

  • Battery ECU assembly

  • Wire harness or connector

  • HV battery junction block assembly

 Does not come on

Master Warning Light:

Comes on
Tip:

After checking for the above DTCs, check the hybrid system Data List item "Hybrid Battery Cooling Fan Intake Air Temperature 1" 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
Table 1. Related Data List
DTC No. Data List
P0AAC11 Hybrid Battery Cooling Fan Intake Air Temperature 1
P0AAC15
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CONFIRMATION DRIVING PATTERN

Tip:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. With power switch on (IG) and wait for 5 seconds.

  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE, perform driving pattern again.

Table 2. *1 HV Battery Intake Air Temperature Sensor *2 HV Battery *3 Battery ECU Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

CAUTION:

  • B004STG

    Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the HV battery

  • B004Y5N

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.

  • B004SX1

    After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • B004W3JC06
    *a Without waiting for 10 minutes

    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.

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    Tip:

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

  • Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.

    If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.

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.

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check for DTCs.


      1. Powertrain > HV Battery > Trouble Codes



      1. Powertrain > Hybrid Control > Trouble Codes


      Result
      Result Proceed to
      "P0AAC11 or P0AAC15" only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid battery system in the table below are output. B
      DTCs of hybrid control system in the table below are output. C
      System Relevant DTC
      Hybrid battery system P060A47 Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060B49 Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
      P060687 Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
      Hybrid control system P0A1F94 Hybrid/EV Battery Energy Control Module Unexpected Operation

    5. Turn the power switch off.


  2. Click here

    CHECK FREEZE FRAME DATA


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / HV battery / Trouble Codes.

    4. Check and record the "Hybrid Battery Current Sensor Power Supply Voltage" freeze frame data.


      1. Powertrain > HV Battery > Trouble Codes


      Tip:

      Use this for reference when measuring the hybrid battery current sensor power supply voltage.

    5. Turn the power switch off.

      Result
      Proceed to
      NEXT

  3. Click here

    CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY CONNECTOR)

    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 No. 1 hybrid battery cover sub-assembly.

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    3. B004V2KN04

      Check the connections of the e4 battery ECU assembly connector.

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

    4. Install the upper No. 1 hybrid battery cover sub-assembly.

      Result
      Result
      OK
      NG

  4. Click here

    CHECK INSTALLATION OF HV BATTERY INTAKE 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 HV battery cover panel.

      Click here

    3. B004Y8J

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

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

    4. Install the upper HV battery cover panel.


    • AClick here
    • B

      REPLACE NO. 2 HV BATTERY PACK WIRE (HV BATTERY INTAKE AIR TEMPERATURE SENSOR)Click here

    • C

      INSTALL PARTS CORRECTLY

  5. Click here

    CHECK HV BATTERY (HV BATTERY INTAKE 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 No.1 hybrid battery cover sub-assembly.

      Click here

    3. B004V2KN04

      Disconnect the e4 battery ECU assembly connector.

      Note:

      Before disconnecting the connector, check that it is not loose or disconnected.

    4. B004WWKC17
      *a

      Rear view of wire harness connector

      (to Battery ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Thermistor Temperature Specified Condition
      e4-28 (TC0) - e4-8 (GC0) Always 0 to 10°C (32 to 50°F) 17.7 to 27.8 kΩ
      10 to 20°C (50 to 68°F) 12.0 to 18.2 kΩ
      20 to 30°C (68 to 86°F) 8.22 to 12.2 kΩ
      30 to 40°C (86 to 104°F) 5.74 to 8.41 kΩ
      40 to 50°C (104 to 122°F) 4.09 to 5.91 kΩ

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e4-28 (TC0) - Body ground and other terminals Always 10 kΩ or higher
      e4-8 (GC0) - Body ground and other terminals Always 10 kΩ or higher

    6. Reconnect the e4 battery ECU assembly connectors.

    7. Install the upper No.1 hybrid battery cover sub-assembly.

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE NO. 2 HV BATTERY PACK WIRE (HV BATTERY INTAKE AIR TEMPERATURE SENSOR)Click here

  6. Click here

    CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - HV BATTERY JUNCTION BLOCK ASSEMBLY)

    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 No. 1 hybrid battery cover sub-assembly.

      Click here

    3. B004V2KN04

      Disconnect the e4 battery ECU assembly connector.

      Note:

      Before disconnecting the connector, check that it is not loose or disconnected.

    4. B004XPQN04

      Disconnect the e1 battery current sensor connector from the HV battery junction block assembly.

      Note:

      Before disconnecting the connector, check that it is not loose or disconnected.

    5. B004UNQC08
      *a

      Front view of wire harness connector

      (to HV Battery Junction Block Assembly (Battery Current Sensor))
      *b

      Rear view of wire harness connector

      (to Battery ECU Assembly)

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      e4-19(VIB) - e1-1(VIB) Always Below 1 Ω
      e4-37(GIB) - e1-3(GIB) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      e4-19(VIB) or e1-1(VIB) - Body ground and other terminals Always 10 kΩ or higher
      e4-37(GIB) or e1-3(GIB) - Body ground and other terminals Always 10 kΩ or higher

    6. Reconnect the e1 battery current sensor connector to the HV battery junction block assembly.

    7. Reconnect the e4 battery ECU assembly connector.

    8. Install the upper No. 1 hybrid battery cover sub-assembly.

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    CHECK BATTERY ECU ASSEMBLY (VIB VOLTAGE)

    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 No. 1 hybrid battery cover sub-assembly.

      Click here

    3. B004WQBC04
      *a

      Front view of wire harness connector

      (No. 2 HV Battery Pack Wire Connector)

      Apply auxiliary battery voltage between No. 2 HV battery pack wire connector terminals Le1-14 (IGCT) - Le1-1 (GND).

      Note:

      Make sure that the battery positive and battery negative do not contact one another.

    4. B004SB8C08
      *a

      Component with harness connected

      (to Battery ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      e4-19 (VIB) - e4-37 (GIB)

      Auxiliary battery positive (+) → Le1 -14 (IGCT)

      Auxiliary battery negative (-) → Le1 -1 (GND)

      		 4.6 to 5.4 V

    5. Disconnect the Le1 connector of the No. 2 HV battery pack wire from the auxiliary battery.

    6. Install the upper No. 1 hybrid battery cover sub-assembly.

      Result
      Proceed to
      OK
      NG

  8. Click here

    HV BATTERY JUNCTION BLOCK ASSEMBLY (BATTERY CURRENT SENSOR OUTPUT VOLTAGE)

    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 HV battery cover panel.

      Click here

    3. B004XPQN04

      Disconnect the e1 battery current sensor connector from the HV battery junction block assembly.

      Note:

      Before disconnecting the connector, check that it is not loose or disconnected.

    4. B004WQBC04
      *a

      Front view of wire harness connector

      (No. 2 HV Battery Pack Wire Connector)

      Apply auxiliary battery voltage between No. 2 HV battery pack wire connector terminals Le1-14 (IGCT) - Le1-1 (GND).

      Note:

      Make sure that the battery positive and battery negative do not contact one another.

    5. B004VYXC50
      *a

      Front view of wire harness connector

      (to HV Battery Junction Block Assembly (Battery Current Sensor))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      e1-1(VIB) - e1-3 (GIB)

      Auxiliary battery positive (+) → Le1 -14 (IGCT)

      Auxiliary battery negative (-) → Le1 -1 (GND)

      		 4.6 to 5.4 V

    6. Disconnect the Le1 connector of the No. 2 HV battery pack wire from the auxiliary battery.

    7. Reconnect the e1 battery current sensor connector to the HV battery junction block assembly.

    8. Install the upper HV battery cover panel.

      Result
      Proceed to
      OK
      NG