ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0710, P0712, P0713

DTC Code DTC Name
P0710 Transmission Fluid Temperature Sensor "A" Circuit
P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input
P0713 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 ECM.

A003ECTE06

The ECM applies a voltage to the temperature sensor through ECM 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 ECM calculates the fluid temperature based on the voltage signal.

DTC No. DTC Detection Condition Trouble Area
P0710

  • (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

  • ECM
P0712 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

  • ECM
P0713

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

  • ECM

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 ECM determines the ATF temperature, and the ECM 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 ECM interprets this as a fault in the ATF sensor or wiring. The ECM 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

A003FPWE03

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic 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 / Powertrain / Engine and 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. A003B93E01
      Text in Illustration
      *a

      Component without harness connected

      (ATF temperature sensor)

      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 at either of the ATF temperatures 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 (ATF TEMPERATURE SENSOR - ECM)


    1. A003BS9E09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Connect the ATF temperature sensor connector to the transmission.

    2. Disconnect the ECM connector.

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

      Resistance
      Tester Connection Specified Condition
      D97-114 (THOC) - D97-72 (E2) 79 Ω to 156 kΩ

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

      Resistance
      Tester Connection Specified Condition
      D97-114 (THOC) - Body ground 10 kΩ or higher
      D97-72 (E2) - Body ground ↑

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM