HYBRID CONTROL SYSTEM, Diagnostic DTC:P274A11, P274A15

DTC Code DTC Name
P274A11 Transmission Fluid Temperature Sensor "C" Circuit Short to Ground
P274A15 Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    These DTCs are stored when the transmission fluid temperature sensor output is abnormal. The cause of this malfunction may be one of the following:


      Hybrid vehicle control ECU internal malfunction

    • Hybrid vehicle control ECU malfunction


      Transmission fluid temperature sensor malfunction

    • Internal transmission fluid temperature sensor malfunction

    • Open or short in transmission fluid temperature sensor


      Wire harness between the transmission fluid temperature sensor and hybrid vehicle control ECU

    • The connectors are not connected properly

    • Foreign matter or water on the connector terminals

    • Open or short in wire harness

DESCRIPTION

The resistance of the thermistor built into the transmission fluid temperature sensor changes in accordance with changes in the transmission fluid temperature. The lower the transmission fluid temperature, the higher the thermistor resistance. Conversely, the higher the transmission fluid temperature, the lower the resistance.

B006ICCE02
*a Resistance (kΩ)
*b Temperature (°C (°F))
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P274A11 Transmission Fluid Temperature Sensor "C" Circuit Short to Ground

Line short or short to ground in the transmission fluid temperature sensor circuit

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)

 Come on

Master Warning Light:

Comes on
P274A15 Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open

Open or short to +B in the transmission fluid temperature sensor circuit

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)

 Come on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P274A11 Transaxle Oil Temperature
P274A15

Tech Tips

After confirming that DTC P274A11 or P274A15 is output, use the GTS to check "Transaxle Oil Temperature" 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

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. With power switch on (IG) and wait for 5 seconds or more.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

B006HCQE36

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE 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 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

      B006HM7C01
      *A for LHD *B for RHD
      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 (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR)


    1. B006HCR

      Check the connection condition of the transmission fluid 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 (TRANSAXLE OIL TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Transaxle Oil Temperature.

    4. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Transaxle Oil Temperature
      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

    INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  4. INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)


    1. B006HCR

      Disconnect the C1 transmission fluid temperature sensor connector.

    2. B006HKDC01
      *a

      Component without harness connected

      (Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3(TTA) - 13(ETTA) Power switch OFF 0.3436 to 1442 kΩ

    3. Reconnect the C1 transmission fluid temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

  5. CHECK HYBRID VEHICLE CONTROL ECU


    1. Connect terminals 40 (TTA) and 39 (ETTA) of the A41 hybrid vehicle control ECU connector.

      B006I3NC70
      *a

      Component with harness connected

      (to Hybrid Vehicle 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 / Transaxle Oil Temperature.

    5. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Transaxle Oil Temperature
      OK
      Tester Display Condition Specified Condition
      Transaxle Oil Temperature

      Terminals A41-40 (TTA) and A41-39 (ETTA) 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 (TRANSMISSION FLUID TEMPERATURE SENSOR)


    1. B006HCR

      Disconnect the C1 transmission fluid temperature sensor connector.

    2. B006HKDC01
      *a

      Component without harness connected

      (Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3(TTA) - 13(ETTA) Power switch OFF 0.3436 to 1442 kΩ

    3. Reconnect the C1 transmission fluid temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    OK

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


    1. Disconnect the C1 transmission fluid temperature sensor connector.

    2. Disconnect the A41 hybrid vehicle control ECU connector.

    3. B006J7GC04
      *a

      Front view of wire harness connector

      (to Transmission Fluid Temperature Sensor)
      *b

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C1-3 (TTA) - A41-40 (TTA) Power switch off Below 1 Ω
      C1-13 (ETTA) - A41-39 (ETTA) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C1-3 (TTA) or A41-40 (TTA) - Body ground and other terminals Power switch off 10 kΩ or higher
      C1-13 (ETTA) or A41-39 (ETTA) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A41 hybrid vehicle control ECU connector.

    5. Reconnect the C1 transmission fluid temperature sensor connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR