CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0712, P0713

DTC Code DTC Name
P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input
P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input

DESCRIPTION

The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is input into the ECM.

The sensor resistance changes with the transmission fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies a voltage to the temperature sensor through ECM terminal THO1, and the ECM calculates the fluid temperature based on the voltage signal.

Tech Tips

The CVT fluid temperature is likely to increase under conditions such as towing, climbing hills and in heavy traffic.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0712

  1. -

  2. Short in CVT fluid temperature sensor circuit

  3. 0.5 seconds

  4. 1-trip detection logic

  • Short in CVT fluid temperature sensor circuit

  • Continuously variable transaxle assembly

  • ECM
P0713

  1. a. 10 seconds or more after starting engine

    (Engine coolant temperature and intake air temperature at engine start are higher than -29.375°C (-20.9°F))

    b. 15 minutes or more after starting engine

    (Engine coolant temperature and intake air temperature at engine start are at -29.375°C (-20.9°F) or lower)

  2. Open in CVT fluid temperature sensor circuit

  3. 0.5 seconds

  4. 1-trip detection logic

  • Open in CVT fluid temperature sensor circuit

  • Continuously variable transaxle assembly

  • ECM

MONITOR DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the ECM determines the CVT fluid temperature and detects opens or shorts in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the CVT fluid sensor or wiring. The ECM turns on the MIL and stores the DTC.

*1: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.

*2: -40°C (-40°F) is indicated regardless of the actual CVT fluid temperature.

Tech Tips

The CVT fluid temperature can be checked on the intelligent tester display.

WIRING DIAGRAM

A005IVRE01

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (A/T OIL TEMPERATURE 1)


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List.

    7. In accordance with the display on the tester, read the Data List.

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Temperature 1

      CVT Fluid Temperature Sensor Value/

      min.: -40°C (-40°F)

      max.: 215°C (419°F)

      • After Stall Test; Approximately 100°C (212°F)

      • Equal to ambient temperature when cold soak

      		 If value is -40°C (-40°F) or 150°C (302°F) or more, CVT fluid temperature sensor circuit is open or short.
      Result
      Result Proceed to
      Data display is not within Normal Condition range A
      Data display is within Normal Condition range B

    B

    REPLACE ECM Click here

    A

  2. INSPECT CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY (TRANSMISSION WIRE) (CVT FLUID TEMPERATURE SENSOR)


    1. A005LGLE05
      Text in Illustration
      *a

      Component without harness connected:

      (Continuously Variable Transaxle Assembly (Transmission Wire))

      Disconnect the B74 transmission wire connector from the transaxle.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (THO) - 6 (E2) Always 79 Ω to 156 kΩ
      1 (THO) - Body ground Always 10 kΩ or higher
      6 (E2) - Body ground Always 10 kΩ or higher

      Tech Tips

      If the resistance is outside the specified range at either of the CVT fluid temperatures shown in the table below, the driveability of the vehicle may be affected.

      CVT fluid Temperature Specified Condition
      10°C (50°F) 5.6 to 7.3 kΩ
      25°C (77°F) 3.5 kΩ
      110°C (230°F) 0.22 to 0.27 kΩ

    NG

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    1. Disconnect the B22 (for LHD) or B23 (for RHD) ECM connector.

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

      Standard Resistance (Check for Open) (for LHD)
      Tester Connection Condition Specified Condition
      B74-1 (THO) - B22-95 (THO1) Always Below 1 Ω
      B74-6 (E2) - B22-96 (ETHO) Always Below 1 Ω
      Standard Resistance (Check for Open) (for RHD)
      Tester Connection Condition Specified Condition
      B74-1 (THO) - B23-95 (THO1) Always Below 1 Ω
      B74-6 (E2) - B23-96 (ETHO) Always Below 1 Ω
      Standard Resistance (Check for Short) (for LHD)
      Tester Connection Condition Specified Condition
      B22-95 (THO1) - Body ground Always 10 kΩ or higher
      B22-96 (ETHO) - Body ground Always 10 kΩ or higher
      Standard Resistance (Check for Short) (for RHD)
      Tester Connection Condition Specified Condition
      B23-95 (THO1) - Body ground Always 10 kΩ or higher
      B23-96 (ETHO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  5. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Skid control computer (w/o VSC)

      • Oil pressure sensor

      • Deceleration sensor (w/o VSC)

      • Airbag sensor assembly (Yaw rate sensor) (w/ VSC)

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END

  6. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly Click here.


    NEXT

  7. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Skid control computer (w/o VSC)

      • Oil pressure sensor

      • Deceleration sensor (w/o VSC)

      • Airbag sensor assembly (Yaw rate sensor) (w/ VSC)

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END