AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0712, P0713

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

DESCRIPTION

The ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM.

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

The sensor resistance changes with the ATF 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
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

  • Transmission wire (ATF temperature sensor)

  • ECM
P0713 ATF temperature sensor resistance is more than 156 kΩ for 0.5 seconds or more. Either of the following conditions is met (1-trip detection logic):

  • Open in ATF temperature sensor circuit

  • Transmission wire (ATF temperature sensor)

  • ECM
Condition (A): 297 seconds*1 or 15 minutes*2 or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less.
Condition (B): 10 seconds or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (- 20.875°F).

MONITOR DESCRIPTION

These DTCs indicate an open or short in the ATF temperature sensor circuit. The 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*1 or 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 GTS display.

WIRING DIAGRAM

A01FI1RE02

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the GTS 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 GTS to the DLC3.

    4. Turn the engine switch on (IG) position.

    5. Turn the GTS on.

    6. Select the item "Powertrain / Engine and ECT / Data List".

    7. According to the display on the GTS, read the "Data List".

      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 when engine 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.

      Tech Tips

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

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

      Measure the resistance between terminal OIL 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). When P0713 is set, P0711 cannot be detected.

      It is not necessary to inspect the circuit when P0711 is set.

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)


    1. A01FEYSE51
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Wire)

      Disconnect the transmission wire connector from the transmission.

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

      Standard resistance
      Tester Connection Specified Condition
      9 (OIL) - 1 (E2) 79 Ω to 156 kΩ
      9 (OIL) - Body ground 10 kΩ or higher
      1 (E2) - 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.

      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

    NG

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    OK

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


    1. A01FIKXE06
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to ECM)

      Connect the transmission wire connector to the transmission.

    2. Disconnect the ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      F1-29 (THO1) - F1-28 (E2) 79 Ω to 156 kΩ

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

      Standard resistance (Check or short)
      Tester Connection Specified Condition
      F1-29 (THO1) - Body ground 10 kΩ or higher
      F1-28 (E2) - Body ground ↑

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here