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. DTC Detection Condition Trouble Area
P0A38-257

Short to GND in the generator temperature sensor circuit

(1 trip detection logic)

  • Wire harness or connector

  • Power management control ECU

  • Hybrid vehicle transmission assembly (Generator temperature sensor)
P0A39-2599

Open or short to +B in the generator temperature sensor circuit

(1 trip detection logic)

Tech Tips

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

Related Data List
DTC No. Data List
P0A38-257 Motor Temp No2
P0A39-259
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

A000NYNE29
*a ADC
*b Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor)
*c No. 1 Engine Room Relay Block and Junction Block Assembly Connector
*d Power Management 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 (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. A000R79C01
      *A for LHD
      *B for RHD

      Check the connection condition of the power management control ECU connectors and the contact pressure of each terminal.

    2. 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

  2. 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

    CHECK GENERATOR TEMPERATURE SENSOR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  3. CHECK POWER MANAGEMENT CONTROL ECU


    1. A000RL9C35
      *a

      Component with harness connected

      (Power Management Control ECU)

      Connect terminals 27 (GMT) and 26 (GMTG) of connector A36 of the power management 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 A36-27 (GMT) and A36-26 (GMTG) connected, power switch on (IG) 215°C (419°F)

    6. Turn the power switch off.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

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


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. B002BLJ

      Check the connection condition of the generator temperature sensor connector and the contact pressure of each terminal.

    3. 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

  5. INSPECT HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B002BLJ

      Disconnect the generator temperature sensor connector.

    2. B002B72C02
      *a

      Component without harness connected

      (Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the generator temperature sensor connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

  6. CHECK GENERATOR TEMPERATURE SENSOR


    1. A000OPDC02
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly Connector

      Disconnect the No. 1 engine room relay block and junction block assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      AF1-41 - AF1-42 Power switch off 0.3436 to 1442 kΩ
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      AF1-41 or AF1-42 - Body ground and other terminals Power switch off 10 kΩ or higher

    3. Reconnect the No. 1 engine room relay block and junction block assembly connector.


    NG

    CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the No. 1 engine room relay block and junction block assembly connector.

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

    3. A000REEC07
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly Connector
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      AF1-41 - A36-27 (GMT) Power switch off Below 1 Ω
      AF1-42 - A36-26 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      AF1-41 or A36-27 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      AF1-42 or A36-26 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Connect the power management control ECU connector.

    5. Connect the No. 1 engine room relay block and junction block assembly connector.


    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

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


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. B002BLJ

      Check the connection condition of the generator temperature sensor connector and the contact pressure of each terminal.

    3. 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

  9. INSPECT HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B002BLJ

      Disconnect the generator temperature sensor connector.

    2. B002B72C02
      *a

      Component without harness connected

      (Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the generator temperature sensor connector.


    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE TRANSMISSION ASSEMBLY)

    NG

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here