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. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A38-257 Generator Temperature Sensor Circuit Low

Short to ground in the generator temperature sensor circuit

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Hybrid vehicle transaxle 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

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Hybrid vehicle transaxle assembly (Generator temperature sensor)

 Does not come on

Master Warning Light:

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

Tech Tips

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

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

WIRING DIAGRAM

A0001TUE24
*a ADC
*b Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor)
*c No. 1 Engine Room Relay Block Connector
*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
    Proceed to
    A
    B
    C

    1. A0001LZC02
      *A for LHD
      *B for RHD

      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. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)


    1. B002IVA

      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.


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

    4. Read the Data List.

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

    5. Turn the power switch off.


    215°C (419°F)

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

    Same as actual temperature

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    -40°C (-40°F)

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


    1. B002IVA

      Disconnect the C41 generator temperature sensor connector.

    2. A0000OKC01
      *a

      Component without harness connected

      (Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the C41 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  5. CHECK HYBRID VEHICLE CONTROL ECU


    1. B002HDZC45
      *a

      Component with harness connected

      (to Hybrid Vehicle Control ECU)

      Connect terminals 26 (GMT) and 27 (GMTG) of the A60 hybrid vehicle control ECU 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.


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

    5. Read the Data List.

      OK
      Tester Display Condition Specified Condition
      Motor Temp No2

      Terminals A60-26 (GMT) and A60-27 (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 Click here

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


    1. B002IVA

      Disconnect the C41 generator temperature sensor connector.

    2. A0000OKC01
      *a

      Component without harness connected

      (Hybrid Vehicle Transaxle Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the C41 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

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


    1. Disconnect the C41 generator temperature sensor connector.

    2. Disconnect the A60 hybrid vehicle control ECU connector.

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

      A00018KC03
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)

      		 *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)
      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C41-4 (GMT) - A60-26 (GMT) Power switch off Below 1 Ω
      C41-8 (GMTG) - A60-27 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C41-4 (GMT) or A60-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      C41-8 (GMTG) or A60-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A60 hybrid vehicle control ECU connector.

    5. Reconnect the C41 generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR