HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A38-257, P0A39-259

DTC Code DTC Name
P0A38-257 Generator Temperature Sensor Circuit Low
P0A39-259 Generator Temperature Sensor Circuit High

DESCRIPTION

Refer to the description for DTC P0A37-260 Click here.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A38 257 Short to GND in the generator temperature sensor circuit

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Hybrid vehicle generator assembly (Generator temperature sensor)
P0A39 259 Open or short to +B in the generator temperature sensor circuit

Tech Tips

After confirming that DTC P0A38-257 or P0A39-259 is output, use the GTS to check "Motor Temp No2" in the hybrid vehicle control ECU Data List.

Displayed Temperature Malfunction
-40°C (-40°F) Open circuit or short to +B
215°C (419°F) Short circuit or short to GND

WIRING DIAGRAM

B005YARE92
*a ADC
*b Engine Room Relay Block and Junction Block Assembly Connector
*c Hybrid Vehicle Generator Assembly(Generator Temperature Sensor)
*d Hybrid Vehicle Control ECU

CAUTION / NOTICE / HINT

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the power switch on (IG) and wait for 5 seconds or more.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

    Result
    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    1. Check the connection condition of the hybrid vehicle control ECU connectors and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Click here

      B005ZP3C04
      *A for LHD *B for RHD
      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      Result
      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)


    1. B005Y2ZN07

      Check the connection condition of the D7 generator temperature sensor connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Click here

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      Result
      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. READ VALUE USING GTS (MOTOR TEMP NO2)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

    4. Read the Data List.

      Result
      Result Proceed to
      -40°C (-40°F) A
      215°C (419°F) B
      Same as actual temperature C

    5. Turn the power switch off.


    B

    INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  4. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B005Y9JN05

      Disconnect the D7 generator temperature sensor connector.

    2. B005YPVC17
      *a

      Component without harness connected

      (Generator Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D7-8 (GMT) - D7-4 (GMTG) Power switch off 0.3436 to 1442 kΩ

    3. Connect the D7 generator temperature sensor connector.


    NG

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

    OK

  5. INSPECT HYBRID VEHICLE CONTROL ECU


    1. B005Y57E03
      Text in Illustration
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      Connect terminals 26 (GMT) and 27 (GMTG) of connector A21 of the hybrid vehicle control ECU.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

    5. Read the Data List.

      OK
      Tester Display Condition Specified Condition
      Motor Temp No2

      Terminals GMT and GMTG connected.

      Power switch on (IG)

      		 215°C (419°F)

    6. Turn the power switch off.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  6. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B005Y9JN05

      Disconnect the D7 generator temperature sensor connector.

    2. B005YPVC17
      *a

      Component without harness connected

      (Generator Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D7-8 (GMT) - D7-4 (GMTG) Power switch off 0.3436 to 1442 kΩ

    3. Connect the D7 generator temperature sensor connector.


    NG

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR)


    1. Disconnect the D7 generator temperature sensor connector.

    2. Disconnect the A21 hybrid vehicle control ECU connector.

    3. B005YN8E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)
      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D7-8 (GMT) - A21-26 (GMT) Power switch off Below 1 Ω
      D7-4 (GMTG) - A21-27 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D7-8 (GMT) or A21-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-4 (GMTG) or A21-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A21 hybrid vehicle control ECU connector.

    5. Reconnect the D7 generator temperature sensor connector.


    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR