AUTOMATIC TRANSAXLE 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 Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the ECM.

A002BYNE01
*1 Resistance
*2 Acceptable range
*3 Temperature

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. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input 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)

  • Wiring harness connector

  • ECM

 Comes on DTC stored
P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input

ATF temperature sensor resistance is more than 156 kΩ for 0.5 seconds or more, and either of the following conditions is met (1-trip detection logic):


  • Condition (A): 314 seconds 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).

  • Open in ATF temperature sensor circuit

  • Transmission wire (ATF temperature sensor)

  • Wiring harness connector

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit. The ATF temperature sensor converts ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and can detect an open or short in the ATF temperature 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 sensor or wiring. The ECM will illuminate the MIL and store a 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

A002AI0E07
*1 OIL
*2 ATF Temperature Sensor
*3 Automatic Transaxle
*4 Wiring Harness Connector

CAUTION / NOTICE / HINT

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.


  1. DATA LIST

    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 GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

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


      Powertrain > Engine > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/T Oil Temperature 1 ATF temperature sensor value

      Min.: -40°C (-40°F)

      Max.: 215°C (419°F)

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

      • While engine is cold:

        Equal to ambient temperature

      		 If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or short circuited

      Powertrain > Engine > Data List
      Tester Display
      A/T Oil Temperature 1

      Tech Tips

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

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

      Measure the resistance between terminal THO1 (OT) and body ground.

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

      Tech Tips

      If the circuit related to the ATF temperature sensor becomes open, P0713 is stored immediately (in 0.5 seconds). When P0713 is stored, P0711 cannot be detected.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR CIRCUIT)


    1. A0027TIC05
      *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
      C1-120 (THO1) - C1-119 (ETHO) Always 79 Ω to 156 kΩ
      C1-120 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      C1-119 (ETHO) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)


    1. Disconnect the connector from the wiring harness connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C1-120 (THO1) - C2-13 (OIL) Always Below 1 Ω
      C1-119 (ETHO) - C2-12 (E2) Always Below 1 Ω
      C1-120 (THO1) or C2-13 (OIL) - Body ground and other terminals Always 10 kΩ or higher
      C1-119 (ETHO) or C2-12 (E2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)


    1. A002C2RC01
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the wiring harness connector from the transaxle.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-17 (E2) - A-18 (THO1) Always 79 Ω to 156 kΩ
      A-17 (E2) - Body ground and other terminals Always 10 kΩ or higher
      A-18 (THO1) - Body ground and other terminals Always 10 kΩ or higher

      Tech Tips

      If the resistance is out of the specified range with 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
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WIRING HARNESS CONNECTOR Click here

    NG

    REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) Click here