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AUTOMATIC TRANSMISSION SYSTEM (for 3UR-FE), Diagnostic DTC:P0712, P0713

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DTC Code DTC Name
P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input
P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input
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DESCRIPTION

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

The ECM applies a voltage to the temperature sensor through ECM terminal THO1.

The sensor resistance changes with the ATF temperature.

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

The ECM calculates the ATF temperature based on the voltage signal.

DTC Code DTC Detection Condition Trouble Area
P0712 No. 1 ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1 trip detection logic).

  • Short in No. 1 ATF temperature sensor circuit

  • No. 1 ATF temperature sensor (No. 1 transmission wire)

  • ECM
P0713 When 15 min. or more have elapsed after engine is started, No. 1 ATF temperature sensor resistance is more than 156 kΩ for 0.5 sec. or more (1 trip detection logic).

  • Open in No. 1 ATF temperature sensor circuit

  • No. 1 ATF temperature sensor (No. 1 transmission wire)

  • ECM
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MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.

Tip:

  • *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.

  • The ATF temperature can be checked on the intelligent tester display.

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WIRING DIAGRAM

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INSPECTION PROCEDURE


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  1. DATA LIST

    Tip:

    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 engine switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the intelligent tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List.

    7. According to the display on the intelligent tester, read the Data List.

      Table 1. Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Temperature 1

      No. 1 ATF temperature sensor value/

      Min.: -40°C (-40°F)

      Max.: 215°C (419°F)

      • After stall test: Approximately 80°C (176°F)

      • Equal to ambient temperature while engine is cold

      		 If the value is -40°C (-40°F) or 215°C (419°F), the No. 1 ATF temperature sensor circuit is open or shorted.
      Tip:

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

      When DTC P0713 is output and the intelligent tester output is -40°C (-40°F), there is an open circuit.

      Measure the resistance between terminal THO1 and the body ground.

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


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    INSPECT NO. 1 TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)


    1. A015739E31

      Disconnect the No. 1 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (OT-) - 9 (OT+) Always 79 Ω to 156 kΩ
      1 (OT-) - Body ground Always 10 kΩ or higher
      9 (OT+) - Body ground Always 10 kΩ or higher
      Tip:

      If the resistance is out of the specified range at one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.

      Standard Resistance
      ATF Temperature Specified Condition
      10°C (50°F) 5 to 8 kΩ
      25°C (77°F) 2.5 to 4.5 kΩ
      110°C (230°F) 0.22 to 0.28 kΩ
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (No. 1 Transmission Wire)

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    CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)


    1. A015CW9E16

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C45-122 (THO1) - C45-98 (ETHA) Always 79 Ω to 156 kΩ
      C45-122 (THO1) - Body ground Always 10 kΩ or higher
      C45-98 (ETHA) - Body ground Always 10 kΩ or higher
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

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    REPAIR OR REPLACE NO. 1 ATF TEMPERATURE SENSOR (NO. 1 TRANSMISSION WIRE)Click here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE ECMClick here