AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P071000

DTC Code DTC Name
P071000 Transmission Fluid Temperature Sensor "A" Circuit Range/Performance

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
P071000 Transmission Fluid Temperature Sensor "A" Circuit Range/Performance

Either condition is met: (2-trip detection logic)


  • (a) Certain monitor enabling conditions are met and the ATF temperature is below 20°C (68°F)

  • (b) Certain monitor enabling conditions are met and the ATF temperature is 110°C (230°F) or higher

 ATF temperature sensor (ATF temperature sensor assembly) Comes on DTC stored SAE: P0711

MONITOR DESCRIPTION

This DTC indicates that there is a problem with output signals from the automatic transmission fluid (ATF) temperature sensor and that the sensor itself is defective. 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 or a fault of the ATF temperature sensor.

After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the ECM interprets this as a malfunction, illuminates the MIL and stores the DTC.

When the ATF temperature is 110°C (230°F) or higher and the engine coolant temperature takes 10 sec. or more to reach 60°C (140°F) after a cold start, the ECM also determines this as a fault, illuminates the MIL and stores the DTC.

CAUTION / NOTICE / HINT

Note

If DTCs P071000 and P261029 or P261093 are output simultaneously, confirm that the ATF temperature is as specified in "Normal Condition" using the GTS first. When the ATF temperature is as specified in "Normal Condition", perform troubleshooting for DTC P261029 or 261093.

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  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 value listed under "Normal Condition" are reference values.


    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 a circuit related to the ATF temperature sensor becomes open, P071015 is immediately set (in 0.5 seconds). When P071015 is set, P071000 cannot be detected.

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

PROCEDURE


  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P071000)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Trouble Codes.


      Powertrain > Transmission > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC P071000 is output A
      P071000 and other DTCs are output B

      Tech Tips

      If any DTCs other than P071000 are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK TRANSMISSION FLUID LEVEL


    1. Check the transmission fluid level.

      Click here

      OK
      Automatic transmission fluid level is correct.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    ADJUST FLUID LEVEL Click here