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 CVT fluid temperature into a resistance value for use by the ECM.

The sensor resistance changes with the CVT fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies voltage to the temperature sensor through ECM terminal THO1 and 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 traffic.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input There is a short in the CVT fluid temperature sensor circuit for 0.5 seconds (1 trip detection logic).

  • Wire harness or connector

  • Continuously variable transaxle assembly (CVT fluid temperature sensor)

  • ECM

 Comes on DTC stored
P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input

Either one of the following conditions is met (1 trip detection logic):


  • When 10 seconds or more have elapsed after engine start (engine coolant and intake air temperatures at engine start were higher than -29.375°C (-20.875°F), there is an open in the CVT fluid temperature sensor circuit for more than 0.5 seconds.

  • When 15 minutes or more have elapsed after engine start (engine coolant and intake air temperatures were lower than -29.375°C (-20.875°F) at engine start, there is an open in the CVT fluid temperature sensor circuit for 0.5 seconds.

  • Wire harness or connector

  • Continuously variable transaxle assembly (CVT fluid temperature sensor)

  • ECM

 Comes on DTC stored

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 can detect an open or short 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 malfunction of the CVT fluid temperature sensor or wiring, illuminates the MIL and stores a 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 in the Data List.

WIRING DIAGRAM

A004AFNE01

CAUTION / NOTICE / HINT

Note


  • Perform initialization after replacing any parts related to the continuously variable transaxle system.

    Click here


  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)


    1. A0048QDC31
      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the B115 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) - 7 (E2) Always 79 Ω to 156 kΩ
      1 (THO) - Body ground and other terminals Always 10 kΩ or higher
      7 (E2) - Body ground and other terminals Always 10 kΩ or higher

      Tech Tips

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

      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

    3. Connect the B115 transmission wire connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY Click here

    OK

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


    1. Disconnect the B112*1 or B118*2 ECM connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance (for LHD)
      Tester Connection Condition Specified Condition
      B112-129 (THO1) - B112-130 (ETHO) Always 79 Ω to 156 kΩ
      B112-129 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      B112-130 (ETHO) - Body ground and other terminals Always 10 kΩ or higher
      Standard Resistance (for RHD)
      Tester Connection Condition Specified Condition
      B118-129 (THO1) - B112-130 (ETHO) Always 79 Ω to 156 kΩ
      B118-129 (THO1) - Body ground and other terminals Always 10 kΩ or higher
      B118-130 (ETHO) - Body ground and other terminals Always 10 kΩ or higher

    3. Connect the B112*1 or B118*2 ECM connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  4. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here