AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P071011

DTC Code DTC Name
P071011 Transmission Fluid Temperature Sensor "A" Circuit Short To Ground

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. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P071011 Transmission Fluid Temperature Sensor "A" Circuit Short To Ground The output voltage from the ATF temperature sensor is below 0.142 V for 0.5 sec. or more (1-trip detection logic).

  • Short in ATF temperature sensor circuit

  • Wiring harness connector

  • Transmission wire

  • ATF temperature sensor (ATF temperature sensor assembly)

  • ECM

 Comes on DTC stored SAE: P0712

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 below 79 Ω*1 or higher 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 higher 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

Refer to DTC P071015.

Click here

CAUTION / NOTICE / HINT

Note

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

Click here


  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).

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Transmission / Data List.

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


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/T Oil Temperature No.1 ATF temperature sensor value

      Min.: -40°C (-40°F)

      Max.: 150°C (302°F)

      • After stall test:

        Approx. 80°C (176°F)

      • Equal to ambient temperature when cold soak

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

      Powertrain > Transmission > Data List
      Tester Display
      A/T Oil Temperature No.1

      Tech Tips

      When DTC P071011 is output and the GTS indicates 150°C (302°F) or more, there is a short circuit.

      When DTC P071015 is output and the GTS indicates -40°C (-40°F), there is an open circuit.

      Measure the resistance between terminal THO1 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, P071015 is stored immediately (in 0.5 seconds). When P071015 is stored, P071000 cannot be detected.

      It is not necessary to inspect the circuit when P071000 is stored.

PROCEDURE


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


    1. A01HH0JC63
      *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
      C20-84 (THO1) - C20-83 (ETHO) Always 79 Ω to 156 kΩ
      C20-84 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      C20-83 (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 (WIRING HARNESS CONNECTOR - ECM)


    1. Disconnect the C21 wiring harness connector.

    2. Disconnect the C20 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C21-13 (OIL) or C20-84 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      C21-12 (E2) or C20-83 (ETHO) - 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. A01HJVPC01
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the wiring harness connector.

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

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

      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

  4. INSPECT ATF TEMPERATURE SENSOR


    1. A01HHLAC05
      *a

      Component without harness connected

      (ATF Temperature Sensor Assembly)

      Disconnect the ATF temperature sensor connector.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      THO1 - E2 Always 79 Ω to 156 kΩ
      THO1 - Body ground and other terminals Always 10 kΩ or higher
      E2 - Body ground and other terminals 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.

      Resistance (Reference)
      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 TRANSMISSION WIRE Click here

    NG

    REPLACE ATF TEMPERATURE SENSOR (ATF TEMPERATURE SENSOR ASSEMBLY) Click here