AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P071000

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

SYSTEM DESCRIPTION

The ATF temperature sensor converts the automatic transmission fluid (ATF) 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 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 fluid temperature based on the voltage signal.

DTC No. DTC Detection Condition Trouble Area
P071000

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


    DTC Detection Condition 1:

  1. Certain monitor enabling conditions are met.

  2. ATF temperature is less than 20°C (68°F).

  3. 3 seconds

  4. 2-trip detection logic


    DTC Detection Condition 2:

  1. Certain monitor enabling conditions are met.

  2. ATF temperature is 110°C (230°F) or more.

  3. 3 seconds

  4. 2-trip detection logic

 Transmission wire (ATF temperature sensor)

MONITOR DESCRIPTION

This DTC indicates that there is a problem with output signal from the ATF temperature sensor and that the sensor itself is malfunctioning. 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 sensor circuit or a malfunction of the ATF temperature sensor.

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

WIRING DIAGRAM

Refer to DTC P071012 Click here.

INSPECTION PROCEDURE

Note

If DTCs P071000 and P261029 are output simultaneously, using the GTS, check if the ATF temperature is as specified under the "Normal Condition" column of the Data List. If the ATF temperature is as specified under the "Normal Condition" column of the Data List, perform troubleshooting for DTC P261029 Click here.

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Wait for 5 hours with the engine switch off.

  2. Start the engine.

  3. Drive the vehicle 20 km (12.4 mile) or more over a period of 9 minutes and 10 seconds or more.

  4. After 40 minutes or more have elapsed since performing step (2), turn the engine switch off.

  5. Perform steps (1) through (4) again.

  6. Check for DTCs again Click here.


  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.

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

      Transmission
      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)

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

      • Equal to ambient temperature after cold soak

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

      Tech Tips


      • If DTC P071012 is output and the GTS indicates -40°C (-40°F), the circuit is open.

        If DTC P071014 is output and the GTS indicates 150°C (302°F) or more, there is a short in the circuit.

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

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

      • If a circuit related to the ATF temperature sensor becomes open, DTC P071012 is stored immediately (in 0.5 seconds). If DTC P071012 is stored, DTC P071000 cannot be detected.

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

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.

    5. Read the DTCs using the GTS.

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

      Tech Tips

      If any DTCs other than DTC 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 automatic transmission fluid level Click here.

      OK
      Automatic transmission fluid level is correct.

    NG

    ADJUST FLUID LEVEL

    OK

    REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) Click here