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

A01H26AE03

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01GW3PE01

      Check the connections of the hybrid vehicle control ECU connectors.

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

    NG

    CONNECT SECURELY

    OK

  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

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN)


    1. Turn the power switch off.

    2. Disconnect the generator temperature sensor connector.

    3. A01H067E03

      Connect terminals 4 (GMT) and 8 (GMTG) of vehicle side connector E62 of the generator temperature sensor.

    4. Turn the power switch on (IG).

    5. Select the following menu items: 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)

      		 205°C (401° F)

    NG

    CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR) Click here

    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

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


    1. Turn the power switch off.

    2. A01GY7QE11

      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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT)


    1. Turn the power switch off.

    2. Disconnect the generator temperature sensor connector.

    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 Switch Condition Specified Condition
      Motor Temp No2 Power switch on (IG) -50°C (-58° F)

    NG

    CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR) Click here

    OK

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

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


    1. Turn the power switch off.

    2. Disconnect connector E58 from the hybrid vehicle control ECU.

    3. A01H1ROE04

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

      Standard resistance (Check for open)
      Tester Connection Switch Condition Specified Condition
      E58-25 (GMT) - E62-4 (GMT) Power switch off Below 1 Ω
      E58-24 (GMTG) - E62-8 (GMTG) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      E58-25 (GMT) or E62-4 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      E58-24 (GMTG) or E62-8 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here