AUTOMATIC TRANSMISSION SYSTEM(for 1VD-FTV), 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 ATF temperature sensor converts the fluid 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 becomes higher, the sensor resistance decreases.

One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.

The ECM calculates the fluid temperature based on the voltage signal.

DTC Code DTC Detection Condition Trouble Area
P0712 The No. 1 ATF temperature sensor resistance is below 79 Ω for 0.5 seconds or more (1 trip detection logic).

  • Short in No. 1 ATF temperature sensor circuit

  • No. 1 transmission wire (No. 1 ATF temperature sensor)

  • ECM
P0713

The No. 1 ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more, and one of the following conditions is met (1 trip detection logic).

Condition A:

15 minutes or more have elapsed.

Condition B:

If the conditions needed to detect DTC P0711 have been met, P0713 can be detected immediately following engine start.

  • Open in No. 1 ATF temperature sensor circuit

  • No. 1 transmission wire (No. 1 ATF temperature sensor)

  • ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the Automatic Transmission Fluid (ATF) temperature sensor circuit. The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn on the MIL and store the DTC.

Tech Tips


  • The ATF temperature can be checked on the intelligent tester display.

  • *1: 150°C (302°F) or higher is indicated regardless of the actual ATF temperature.

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

WIRING DIAGRAM

A01X2LIE23

CAUTION / NOTICE / HINT


  1. DATA LIST

    Tech Tips

    Using the intelligent tester 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.

    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.


    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 / ECT / Data List.

    7. According to the display on the tester, read the Data List.

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

      No. 1 ATF temperature sensor value/

      Min.: -40°C (-40°F)

      Max.: 150°C (302°F)

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

      • With engine cold: Equal to ambient temperature

      		 If the value is -40°C (-40°F) or 150°C (302°F), the No. 1 ATF temperature sensor circuit is open or shorted.

      Tech Tips

      When DTC P0712 is stored and the intelligent tester output is 150°C (302°F) or higher, there is a short circuit.

      When DTC P0713 is stored and the intelligent tester output is -40°C (-40°F), there is an open circuit.

      Check the temperature displayed on the tester in order to check if a malfunction exists.

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

      If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately stored (in 0.5 seconds). When P0713 is stored, P0711 cannot be stored. It is not necessary to inspect the circuit when P0711 is stored.

PROCEDURE


  1. INSPECT NO. 1 TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)


    1. A01WZGUE54
      *1 Component without harness connected: (No. 1 Transmission Wire)

      Disconnect the No. 1 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (OT1-) - 9 (OT1+) Always 79 Ω to 156 kΩ
      1 (OT1-) - Body ground Always 10 kΩ or higher
      9 (OT1+) - Body ground Always 10 kΩ or higher

      Tech Tips

      If the resistance is out of the specified range of one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.

      Resistance (Reference)
      ATF 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

    NG

    REPAIR OR REPLACE NO. 1 ATF TEMPERATURE SENSOR (NO. 1 TRANSMISSION WIRE) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)


    1. A01X5EVE02

      Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C45-123 (THO1) - C45-122 (ETHA) Always 79 Ω to 156 kΩ
      C45-123 (THO1) - Body ground Always 10 kΩ or higher
      C45-122 (ETHA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      C46-123 (THO1) - C46-122 (ETHA) Always 79 Ω to 156 kΩ
      C46-123 (THO1) - Body ground Always 10 kΩ or higher
      C46-122 (ETHA) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR