HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A9D-123, P0A9E-123, P0AC7-123, P0AC8-123, P0ACC-123, P0ACD-123

DTC Code DTC Name
P0A9D-123 Hybrid Battery Temperature Sensor "A" Circuit Low
P0A9E-123 Hybrid Battery Temperature Sensor "A" Circuit High
P0AC7-123 Hybrid Battery Temperature Sensor "B" Circuit Low
P0AC8-123 Hybrid Battery Temperature Sensor "B" Circuit High
P0ACC-123 Hybrid Battery Temperature Sensor "C" Circuit Low
P0ACD-123 Hybrid Battery Temperature Sensor "C" Circuit High

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area

P0A9D-123

P0A9E-123

P0AC7-123

P0AC8-123

P0ACC-123

P0ACD-123

 When the temperature of the battery temperature sensor is less than the standard value (open) or higher than the standard value (shorted) (1 trip detection).

  • Hybrid battery thermistor

  • Battery smart unit

  • Wire harness or connector

  • Hybrid battery junction block assembly

Tech Tips

After confirming that a DTC is output, use the intelligent tester to check "Temp of BATT TB 1 to 3" in the hybrid vehicle control system ECU data list.

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

WIRING DIAGRAM

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

INSPECTION PROCEDURE

CAUTION:


  • 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.

  • 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.

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.

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check if DTCs are output.

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

    5. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Temp of Batt TB 1 to 3.

      Tech Tips

      Compare the temperature of the 3 battery temperature sensors to determine the sensor with the malfunction (Temp of Batt TB1 to TB3).


    NEXT

  3. CHECK CONNECTOR CONNECTION CONDITION

    CAUTION:

    Be sure to wear insulated gloves.


    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. A003WUPE15

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

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

    NG

    CONNECT SECURELY

    OK

  4. CHECK HYBRID BATTERY THERMISTOR (BATTERY TEMPERATURE SENSOR)

    CAUTION:

    Be sure to wear insulated gloves.


    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. A003WUPE14

      Disconnect connectors z10 and i1 from the battery smart unit.

    3. A003VTDE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Battery Smart Unit)

      Measure the resistance of the circuit for the malfunctioning sensor (battery temperature sensor 0 to 2).

      Tester Connection
      Tester Connection Battery Temperature Sensor No.
      z10-6 (TBO) - z10-12 (GBO) 0
      z10-5 (TB1) - z10-11 (GB1) 1
      z10-4 (TB2) - z10-10 (GB2) 2
      Standard Resistance
      Thermistor Temperature Switch Condition Specified Condition
      0°C (32°F) Power switch off 26.7 to 27.8 kΩ
      25°C (77°F) Power switch off 9.9 to 10.1 kΩ
      40°C (104°F) Power switch off 5.73 to 5.92 kΩ
    4. A003W5ME10
      Text in Illustration
      *a

      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 Switch Condition Standard Resistance
      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
      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

    5. Connect the battery smart unit connectors.


    NG

    Click here

    OK

    REPLACE BATTERY SMART UNIT Click here

  5. CHECK HARNESS AND CONNECTOR (BATTERY 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. Check the wire harness and connectors of the battery temperature sensor for abnormalities by sight and touch.

      A003XHV
      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 OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID BATTERY THERMISTOR Click here