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 or short to GND in the generator temperature sensor circuit

  • Wire harness or connector

  • Power management 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 intelligent tester to check "Motor Temp No2" in the power management 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

B001LLHE48
*a ADC
*b No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Connector
*c Hybrid Vehicle Generator Assembly(Generator Temperature Sensor)
*d Power Management Control ECU

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT 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 power management 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

      B001M45C01
      *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. B001MW2E05

      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 INTELLIGENT TESTER (MOTOR TEMP NO2)


    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 / 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. B001MW2E04

      Disconnect the D7 generator temperature sensor connector.

    2. B001N3YC17
      *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. CHECK POWER MANAGEMENT CONTROL ECU


    1. B001KSFE03
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      Connect terminals 26 (GMT) and 27 (GMTG) of connector A19 of the power management control ECU.

    2. Connect the intelligent tester 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 POWER MANAGEMENT CONTROL ECU Click here

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


    1. B001MW2E04

      Disconnect the D7 generator temperature sensor connector.

    2. B001N3YC17
      *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 (POWER MANAGEMENT CONTROL ECU - GENERATOR TEMPERATURE SENSOR)


    1. Disconnect the generator temperature sensor connector.

    2. Disconnect connector A19 from the power management control ECU.

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

      B001MV6E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)

      		 *b

      Rear view of wire harness connector

      (to Power Management Control ECU)
      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      D7-4 (GMTG) - A19-27 (GMTG) Power switch off Below 1 Ω
      D7-8 (GMT) - A19-26 (GMT) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      D7-4 (GMTG) or A19-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-8 (GMT) or A19-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)
      *b

      Rear view of wire harness connector

      (to Power Management Control ECU)

    4. Connect the power management control ECU connector.

    5. Connect the generator temperature sensor connector.


    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR