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CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0712, P0713

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

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

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

Tip:

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

DTC Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0712

  1. -

  2. There is a short circuit in the 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. 15 minutes or more after starting the engine.

  2. There is an open circuit in the 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
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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 open or short circuits in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature sensor is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the CVT fluid temperature 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.

Tip:

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

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    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 intelligent 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.

      Table 1. Engine and ECT
      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 speed test: Approx. 80°C (176°F)

      • Equal to ambient temperature after cold soak

      		 If the value is -40°C (-40°F) or 150°C (302°F) or more, the CVT fluid temperature sensor circuit is open or shorted.
      Table 2. Result
      Result Proceed to
      Data displayed is not as specified under Normal Condition A
      Data displayed is as specified under Normal Condition B

  2. Click here

    INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)


    1. A01IPWEE01

      Disconnect the transmission wire connector.

    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
      Tip:

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

      Resistance (Reference)
      CVT Fluid 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
      Table 3. Text in Illustration
      *1

      Component without harness connected

      (Transmission Wire)

  3. Click here

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    1. A01IUJYE43

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C68-70 (THO1) - C68-71 (ETHO) Always 79 Ω to 156 kΩ
      C68-70 (THO1) - Body ground Always 10 kΩ or higher
      C68-71 (ETHO) - Body ground Always 10 kΩ or higher
      Table 4. Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

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    REPLACE ECM


    1. Replace the ECM (Click here).


  5. Click here

    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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (inclination: 0 +/-0.25°).

    • 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.


  6. Click here

    END

  7. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  8. Click here

    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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (inclination: 0 +/-0.25°).

    • 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.


  9. Click here

    END

  10. Click here

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly (Click here).


  11. Click here

    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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (inclination: 0 +/-0.25°).

    • 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.


  12. Click here

    END

  13. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR