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 P0A2C-247 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 transmission assembly
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 HV ECU data list.

Displayed Temperature Malfunction
-50°C (-58° F) Open circuit or short to +B
205°C (401° F) Short to GND

WIRING DIAGRAM

A000ZZRE03
*a Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor)
*b Hybrid Vehicle Control ECU

PROCEDURE


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


    1. A000XH7E01
      *1 Hybrid Vehicle Control ECU

      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

      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 INTELLIGENT TESTER (MOTOR2 TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Data List / Motor Temp No2.

    4. Read the data list.

      Result
      Result Proceed to
      -50°C (-58° F) A
      205°C (401° F) B
      Same as actual temperature C

    B

    CHECK GENERATOR TEMPERATURE SENSOR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  3. CHECK HYBRID VEHICLE CONTROL ECU


    1. Turn the power switch off.

    2. A000Y8OE02
      *1 Component with harness connected: (Hybrid Vehicle Control ECU)

      Connect terminals 25 (GMT) and 24 (GMTG) of connector E58 of the hybrid vehicle control ECU.

    3. Turn the power switch on (IG).

    4. Select the following menu items: 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)

      		 205°C (401° F)

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    OK

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


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. A000WW2

      Check the connection condition of the 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

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


    1. A000WW2

      Disconnect the generator temperature sensor connector.

    2. A000Z19C02
      *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. A000TGSE04
      *1 Rear view of wire harness connector: (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU 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
      E58-24 (GMTG) - E58-25 (GMT) Power switch off 0.3436 to 1442 kΩ
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      E58-24 (GMTG) or E58-25 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher

    3. Reconnect the hybrid vehicle control ECU connector.


    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

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


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. A000WW2

      Check the connection condition of the 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

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


    1. A000WW2

      Disconnect the generator temperature sensor connector.

    2. A000Z19C02
      *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