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.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A38-257 Generator Temperature Sensor Circuit Low Short to GND in the generator temperature sensor circuit

  • Wire harness or connector

  • Hybrid vehicle control ECU assembly

  • Hybrid vehicle generator assembly (Generator temperature sensor)

 Does not come on

Master Warning Light:

Comes on
P0A39-259 Generator Temperature Sensor Circuit High Open or short to +B in the generator temperature sensor circuit

  • Wire harness or connector

  • Hybrid vehicle control ECU assembly

  • Hybrid vehicle generator assembly (Generator temperature sensor)

 Does not come on

Master Warning Light:

Comes on

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 assembly 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

A0031XNE49
*a No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Connector
*b Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor)
*c Hybrid Vehicle Control ECU Assembly

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY 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 assembly 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

      A00329CC03
      *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. A003237

      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

  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.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Motor Temp No2
      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 GENERATOR ASSEMBLY (GENERATOR TEMPERATURE SENSOR) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

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


    1. A003237N01

      Disconnect the B166 generator temperature sensor connector.

    2. A00328TC01
      *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
      B166-8(GMT) - B166-4(GMTG) Power switch OFF 0.3436 to 1442 kΩ

    3. Reconnect the B166 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

    OK

  5. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY


    1. A00324IC44
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

      Connect terminals 26 (GMT) and 27 (GMTG) of the A149 hybrid vehicle control ECU assembly connector.

    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.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Motor Temp No2
      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.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY for RHD: Click here

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


    1. A003237N01

      Disconnect the B166 generator temperature sensor connector.

    2. A00328TC01
      *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
      B166-8(GMT) - B166-4(GMTG) Power switch OFF 0.3436 to 1442 kΩ

    3. Reconnect the B166 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

    OK

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


    1. Disconnect the B166 generator temperature sensor connector.

    2. Disconnect the A149 hybrid vehicle control ECU assembly connector.

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

      A0032APC07
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)

      		 *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)
      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B166-8 (GMT) - A149-26 (GMT) Power switch off Below 1 Ω
      B166-4 (GMTG) - A149-27 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B166-8 (GMT) or A149-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      B166-4 (GMTG) or A149-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A149 hybrid vehicle control ECU assembly connector.

    5. Reconnect the B166 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR