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 (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 THOC.

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 ATF temperature sensor resistance is below 79 Ω for 0.5 sec. or more (1-trip detection logic).

  • Short in ATF temperature sensor circuit

  • ATF temperature sensor

  • ECM
P0713 When 15 minutes or more have elapsed after the engine is started, ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more (1-trip detection logic).

  • Open in ATF temperature sensor circuit

  • ATF temperature sensor

  • ECM

MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature sensor is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ATF temperature warning light blinks and the ECM stores the DTC.

Tech Tips


  • *1: 150°C (302°F) or higher 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.

WIRING DIAGRAM

A01BHJAE04

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 ON.

    5. Turn the intelligent tester on.

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

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

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Temperature 3

      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 ATF temperature sensor circuit is open or shorted.

      Tech Tips

      When DTC P0712 is output and the intelligent tester output is 150°C (302°F) or higher, 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.

      Check the temperature displayed on the tester in order to check if a malfunction exists.

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

PROCEDURE


  1. INSPECT ATF TEMPERATURE SENSOR


    1. A01BF2HE02
      Text in Illustration
      *a

      Component without harness connected

      (ATF Temperature Sensor)

      Disconnect the ATF temperature sensor connector.

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

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

      Tech Tips

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

      Standard Resistance
      ATF Temperature Specified Condition
      20°C (68°F) 10.3 to 13.9 kΩ
      120°C (248°F) 0.58 to 0.65 kΩ

    NG

    REPLACE ATF TEMPERATURE SENSOR

    OK

  2. CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR - ECM)


    1. A01BB6YE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D97-114 (THOC) - D97-72 (E2) Always 79 Ω to 156 kΩ
      D97-114 (THOC) - Body ground Always 10 kΩ or higher
      D97-72 (E2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM