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 generator 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

A0043Z0E80

INSPECTION PROCEDURE

PROCEDURE


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


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

      A00444GE01
      OK
      The connectors are connected securely and there are no contact pressure problems.
      Text in Illustration
      *A for LHD *B for RHD

    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. A0040JQ

      Disconnect the D7 generator temperature sensor connector.

    2. A0042IVE05

      Connect terminals 8 (GMT) and 4 (GMTG) of vehicle side connector D7 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 GMT and 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 generator assembly.

    7. Turn the power switch off.

    8. Reconnect the D7 generator temperature sensor connector.


    NG

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

    OK

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

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


    1. A0044B1E48
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      Connect terminals 26 (GMT) and 27 (GMTG) of connector A20 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 GMT and 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. A0040JQ

      Disconnect the D7 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 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 generator assembly.

    6. Turn the power switch off.

    7. Reconnect the D7 generator temperature sensor connector.


    NG

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

    OK

    REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY Click here

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


    1. Disconnect the D7 generator temperature sensor connector.

    2. Disconnect the A20 power management control ECU connector.

    3. A0043GAE11
      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 Condition Specified Condition
      D7-8 (GMT) - A20-26 (GMT) Power switch off Below 1 Ω
      D7-4 (GMTG) - A20-27 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D7-8 (GMT) or A20-26 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      D7-4 (GMTG) or A20-27 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A20 power management control ECU connector.

    5. Reconnect the D7 generator temperature sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here