СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ С ЭЛЕКТРОННЫМ УПРАВЛЕНИЕМ, Diagnostic DTC:P0710/38, P0712/38, P0713/38

DTC Code DTC Name
P0710/38 Transmission Fluid Temperature Sensor "A" Circuit
P0712/38 Transmission Fluid Temperature Sensor "A" Circuit Low Input
P0713/38 Transmission Fluid Temperature Sensor "A" Circuit High Input

DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value which is input into the TCM.

A01BFHGE06

The TCM applies a voltage to the temperature sensor through TCM terminal THOC.

The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.

One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.

The TCM calculates the fluid temperature based on the voltage signal.

DTC No. DTC Detection Condition Trouble Area
P0710/38

  • (a) and (b) are detected momentarily within 0.5 sec. when neither P0712 nor P0713 is detected (1-trip detection logic)


    1. ATF temperature sensor resistance is less than 79 Ω.

    2. ATF temperature sensor resistance is more than 156 kΩ.

Tech Tips

Within 0.5 sec., the malfunction switches from (a) to (b) or from (b) to (a)

  • Open or short in ATF temperature sensor circuit

  • ATF temperature sensor

  • TCM
P0712/38 ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1-trip detection logic)

  • Short in ATF temperature sensor circuit

  • ATF temperature sensor

  • TCM
P0713/38

ATF temperature sensor resistance is more than 156 kΩ when 15 minutes or more have elapsed after the engine start

DTC is detected for 0.5 sec. or more (1-trip detection logic)

  • Open in ATF temperature sensor circuit

  • ATF temperature sensor

  • TCM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature, and the TCM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1or more than 156 kΩ*2, the TCM interprets this as a fault in the ATF sensor or wiring. The TCM will turn on the MIL and store the DTC.

*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.

*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.

Tech Tips

The ATF temperature can be checked on the Intelligent Tester display.

WIRING DIAGRAM

A01BDTCE01

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the Intelligent Tester Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to shorten labor time.

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the Intelligent Tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn on the tester.

    6. Select the item "Enter / Power train / ECT / Data List".

    7. Follow the instructions on the tester and read the Data List.

      Item

      Measurement Item /

      Range (display)

      		 Normal Condition
      A/T Oil Temperature 3

      ATF Temp. Sensor Value/

      min.: -40°C (-40°F)

      max.: 215°C (419°F)

      • After Stall Test;

        Approx. 80°C (176°F)

      • Equal to ambient temperature when cold soak

      Tech Tips

      When DTC P0712 is output and Intelligent Tester output is 150°C (302°F) or more, there is a short circuit.

      When DTC P0713 is output and Intelligent Tester output is -40°C (-40°F), there is an open circuit.

      Measure the resistance between terminal THOC and body ground.

      Temperature Displayed Malfunction
      -40°C (-40°F) Open circuit
      150°C (302°F) or more Short circuit

      Tech Tips

      If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 second).

PROCEDURE


  1. INSPECT ATF TEMPERATURE SENSOR


    1. A01BBAUE01

      Disconnect the ATF temperature sensor connector from the transmission.

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

      Resistance
      Tester Connection Specified Condition
      1 - 2 79 Ω to 156 kΩ
      1 - Body ground 10 kΩ or higher
      2 - Body ground 10 kΩ or higher

      Tech Tips

      If the resistance is out of the specified range with either the ATF temperature shown in the table below, the driveability of the vehicle may decrease.

      Resistance
      ATF Temperature Specified Condition
      20°C (68°F) 10.3 to 13.9 kΩ
      110°C (230°F) 0.68 to 0.88 kΩ

    NG

    REPLACE ATF TEMPERATURE SENSOR

    OK

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)


    1. A01BB2VE09

      Connect the transmission wire connector to the transmission.

    2. Disconnect the TCM connector.

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

      Resistance
      Tester Connection Specified Condition
      O1-25 (THOC) - O1-23 (E2) 79 Ω to 156 kΩ

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

      Resistance
      Tester Connection Specified Condition
      O1-25 (THOC) - Body ground 10 kΩ or higher
      O1-23 (E2) - Body ground ↑

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM