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 GND in the generator temperature sensor circuit

(1 trip detection logic)

  • Wire harness or connector

  • Power management control ECU

  • Hybrid vehicle transmission 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

  • Power management control ECU

  • Hybrid vehicle transmission 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 power management control ECU Data List.

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

Figure 1. for LHD

B003YA2E01
*a ADC
*b Engine Wire Connector
*c Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor)
*d Power Management Control ECU

Figure 2. for RHD

B003YALE64
*a ADC
*b No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Connector
*c Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor)
*d Power Management 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 (POWER MANAGEMENT CONTROL ECU 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 power management 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.
      B003YJQC01
      *A for LHD *B for RHD
      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. 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)

    CHECK GENERATOR TEMPERATURE SENSOR Click here

    Same as actual temperature

    CHECK FOR INTERMITTENT PROBLEMS Click here

    -40°C (-40°F)

  3. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect terminals 27 (GMT) and 26 (GMTG) of connector A63 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.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Motor Temp No2
    5. B003Y40C53
      *a

      Component with harness connected

      (Power Management Control ECU)

      Read the Data List.

      OK
      Tester Display Condition Specified Condition
      Motor Temp No2

      Terminals A63-27 (GMT) and A63-26 (GMTG) connected

      Power switch on (IG)

      		 215°C (419°F)

    6. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  4. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. B003Y5I

      Check the connection condition of the generator temperature sensor connector and the contact pressure of each terminal.

    3. 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

  5. INSPECT HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B003Y5I

      Disconnect the generator temperature sensor connector.

    2. B003YN7C03
      *a

      Component without harness connected

      (Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

  6. CHECK GENERATOR TEMPERATURE SENSOR


    1. B003YO9C01
      *1 Engine Wire Connector

      for LHD:


      1. Disconnect the FA2 and FA3 engine wire connectors.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        FA3-5 - FA2-9 Power switch off 0.3436 to 1442 kΩ
        Standard Resistance (Check for Short)
        Tester Connection Switch Condition Specified Condition
        FA3-5 or FA2-9 - Body ground and other terminals Power switch off 10 kΩ or higher

      3. Reconnect the FA2 and FA3 engine wire connectors.

    2. B003Y8HC05
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Connector

      for RHD:


      1. Disconnect the AF1 No. 1 engine room relay block and No. 1 junction block assembly connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Switch Condition Specified Condition
        AF1-15 - AF1-16 Power switch off 0.3436 to 1442 kΩ
        Standard Resistance (Check for Short)
        Tester Connection Switch Condition Specified Condition
        AF1-15 or AF1-16 - Body ground and other terminals Power switch off 10 kΩ or higher

      3. Reconnect the AF1 No. 1 engine room relay block and No. 1 junction block assembly connector.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - POWER MANAGEMENT CONTROL ECU) Click here

    C

    CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (ENGINE WIRE - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the FA2 and FA3 engine room main wire connectors.

    2. Disconnect the A63 power management control ECU connector.

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

      B003YGIC01
      *1 Engine Room Main Wire Connector - -
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      FA3-5 - A63-27 (GMT) Power switch off Below 1 Ω
      FA2-9 - A63-26 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      FA3-5 or A63-27 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      FA2-9 or A63-26 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A63 power management control ECU connector.

    5. Reconnect the FA2 and FA3 engine room main wire connectors.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE WIRE - POWER MANAGEMENT CONTROL ECU)

  8. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the AF1 No. 1 engine room relay block and No. 1 junction block assembly connector.

    2. Disconnect the A63 power management control ECU connector.

    3. B003XXQC13
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Connector
      *a

      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
      AF1-15 - A63-27 (GMT) Power switch off Below 1 Ω
      AF1-16 - A63-26 (GMTG) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      AF1-15 or A63-27 (GMT) - Body ground and other terminals Power switch off 10 kΩ or higher
      AF1-16 or A63-26 (GMTG) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A63 power management control ECU connector.

    5. Reconnect the AF1 No. 1 engine room relay block and No. 1 junction block assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

  9. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)


    1. Remove the hybrid vehicle transmission assembly.

      Click here

    2. B003Y5I

      Check the connection condition of the generator temperature sensor connector and the contact pressure of each terminal.

    3. 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

  10. INSPECT HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR TEMPERATURE SENSOR)


    1. B003Y5I

      Disconnect the generator temperature sensor connector.

    2. B003YN7C03
      *a

      Component without harness connected

      (Hybrid Vehicle Transmission Assembly (Generator Temperature Sensor))

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

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

    3. Reconnect the generator temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE WIRE)

    NG

    REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here