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AUTOMATIC TRANSAXLE SYSTEM, 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
Table 1. *1 Resistance *2 Acceptable Range *3 Temperature
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DESCRIPTION

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

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

The sensor resistance changes with the ATF temperature. As the temperature rises, the sensor resistance decreases.

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

The ECM calculates the ATF 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 When the battery voltage is 8 V or more and the ignition switch is ON, the ATF temperature sensor resistance is less than 79 Ω for 0.5 seconds. (1-trip detection logic)

  • Wiring harness connector

  • Short in ATF temperature sensor circuit

  • Transmission wire (ATF temperature sensor)

  • ECM

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

The ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds when either of the following conditions is met (1-trip detection logic):


  • 900 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were -29.375°C (-20.875°F) or less at engine start).

  • 10 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were higher than -29.375°C (-20.875°F) at engine start).

  • Wiring harness connector

  • Open in ATF temperature sensor circuit

  • Transmission wire (ATF temperature sensor)

  • ECM

 Comes on DTC stored
Table 2. DTC Detection Condition Patterns (P0713):
  Vehicle Condition
Pattern 1 Pattern 2
Diagnostic Condition 900 seconds or more have elapsed since the engine was started when the engine coolant temperature and intake air temperature were -29.375°C (-20.875°F) or less. ○ -
10 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were higher than -29.375°C (-20.875°F) at engine start). - ○
Malfunction Condition The ATF temperature sensor resistance is higher than 156 kΩ. ○ ○
Duration 0.5 seconds or more 0.5 seconds or more
Detection Logic 1-trip detection logic 1-trip detection logic
Tip:

DTC P0713 is stored when either of the above detection patterns are met.

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MONITOR DESCRIPTION

These DTCs indicate an open or short in the 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 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 malfunction of the ATF temperature sensor or in the wiring harness, illuminates the MIL and stores 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.

Tip:

The ATF temperature can be checked on the GTS display.

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CONFIRMATION DRIVING PATTERN

Tip:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for 2 minutes or more.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine and wait for 15 minutes or more.

  7. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  8. Input the DTC: P0712 or P0713.

  9. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

Table 3. *1 OIL *2 ATF Temperature Sensor *3 Wiring Harness Connector *4 Transmission Wire
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

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Tip:

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.


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  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. Read the Data List according to the display on the GTS.


      1. Powertrain > Engine and ECT > 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.: 150°C (302°F)

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

        • Equal to ambient temperature: When engine is cold

        		 If the value is -40°C (-40°F) or 150°C (302°F), the ATF temperature sensor circuit is open or shorted.



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




      Tip:

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

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

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

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

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

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

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR CIRCUIT)


    1. Disconnect the C58 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C58-127 (THO1) - C58-128 (ETHO) Always 79 Ω to 156 kΩ
      C58-127 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      C58-128 (ETHO) - Body ground and other terminals Always 10 kΩ or higher
      Tip:

      If the resistance is out of the specified range at any of the ATF temperatures shown in the table below, the drivability 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

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    CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)


    1. Disconnect the C54 wiring harness connector connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C58-127 (THO1) - C54-13 (OIL) Always Below 1 Ω
      C58-128 (ETHO) - C54-12 (E2) Always Below 1 Ω
      C58-127 (THO1) or C54-13 (OIL) - Body ground and other terminals Always 10 kΩ or higher
      C58-128 (ETHO) or C54-12 (E2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)


    1. B006XMZC01
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the wiring harness connector.

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    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
      Tip:

      If the resistance is out of the specified range at any of the ATF temperatures shown in the table below, the drivability 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 CONNECTORClick here

    • NG

      REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)Click here