AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P071000

SYSTEM DESCRIPTION

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

The ECM applies a 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.

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.

CONFIRMATION DRIVING PATTERN

1. Connect the GTS to the DLC3.

2. Turn the engine switch on (IG) and turn the GTS on.

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

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

5. Turn the engine switch on (IG) and turn the GTS on.

6. Start the engine and perform both of the following:




• Drive the vehicle 30 km (19 miles) or more over a period of 17 minutes and 15 seconds or more.

• Wait until 76 minutes and 25 seconds or more have elapsed since the engine was started.

7. Stop the vehicle.

8. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

9. Input the DTC: P071000.

10. 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

    Tech Tips

    
    

    • 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.

WIRING DIAGRAM

Refer to DTC P071011.

Click here

CAUTION / NOTICE / HINT

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.

      
      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)	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.

      
      Powertrain > Transmission > Data List

      Tester Display
      A/T Oil Temperature No.1

      Tech Tips

      
      

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

        If DTC P071011 is output and the GTS indicates 150°C (302°F) or higher, 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 P071015 is stored immediately (in 0.5 seconds). When DTC P071015 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.

      
      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 AUTOMATIC TRANSAXLE FLUID LEVEL

   
   

   1. Check the automatic transaxle fluid level.

      Click here

      OK
      Automatic transaxle fluid level is correct.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) Click here

   NG

   ADJUST AUTOMATIC TRANSAXLE FLUID LEVEL Click here