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 to GND in the generator temperature sensor circuit

  • Wire harness or connector

  • Power management control ECU

  • Hybrid vehicle transmission 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 GTS 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

A01FSLME45

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. A01FQC6E01
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG

    CONNECT SECURELY

    OK

  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

    READ VALUE USING GTS (CHECK FOR SHORT) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  3. READ VALUE USING GTS (CHECK FOR OPEN)


    1. A01FSLW

      Disconnect the generator temperature sensor connector.

    2. A01FRJ5E05

      Connect terminals 4 (GMT) and 8 (GMTG) of vehicle side connector F50 of the generator temperature sensor.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

    6. Read the Data List.

      OK
      Tester Display Condition Specified Condition
      Motor Temp No2 Terminals F50-4 (GMT) and F50-8 (GMTG) connected, power switch on (IG) 215°C (419°F)
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Generator Temperature Sensor)

      Tech Tips

      The generator temperature sensor is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

    7. Turn the power switch off.

    8. Connect the generator temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - GENERATOR TEMPERATURE SENSOR) Click here

    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - GENERATOR TEMPERATURE SENSOR)


    1. A01FVOIE20
      Text in Illustration
      *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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. READ VALUE USING GTS (CHECK FOR SHORT)


    1. A01FSLW

      Disconnect the generator temperature sensor 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.

      OK
      Tester Display Switch Condition Specified Condition
      Motor Temp No2 Power switch on (IG) -40°C (-40°F)

      Tech Tips

      The generator temperature sensor is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

    6. Turn the power switch off.

    7. Connect the generator temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (GENERATOR TEMPERATURE SENSOR - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (GENERATOR TEMPERATURE SENSOR - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the generator temperature sensor connector.

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

    3. A01FRXLE02
      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)

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      F50-4 (GMT) - A36-27 (GMT) Power switch off Below 1 Ω
      E50-8 (GMTG) - A36-26 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      F50-4 (GMT) or A36-27 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      F50-8 (GMTG) 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 generator temperature sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here