AUTOMATIC 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 Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.

A01CFA9E14

The TCM applies a voltage to the temperature sensor through terminal OIL of the TCM.

The sensor resistance changes with the transmission fluid 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 TCM calculates the fluid temperature based on the voltage signal.

DTC No. DTC Detection Condition Trouble Area
P0712 ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1-trip detection logic)

  • Short in ATF temperature sensor circuit

  • Transmission wire

  • ATF temperature sensor

  • TCM
P0713

ATF temperature sensor resistance is more than 156 kΩ when 15 minutes or more have elapsed after the engine starts

DTC is detected for 0.5 sec. or more (1-trip detection logic)

  • Open in ATF temperature sensor circuit

  • Transmission wire

  • ATF temperature sensor

  • TCM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature, and the TCM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1 or more than 156 kΩ*2, the TCM interprets this as a fault in the ATF sensor or wiring. The TCM will turn on the MIL and store the DTC.

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

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

Tech Tips

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

WIRING DIAGRAM

A01CCIFE07

INSPECTION PROCEDURE

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 engine switch off.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the engine switch on (IG).

  5. Turn the intelligent tester on.

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

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

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

    ATF temperature sensor value/

    Min.: -40°C (-40°F)

    Max.: 215°C (419°F)

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

    • While engine is cold:

      Equal to ambient temperature

    		 If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or short circuited

    Tech Tips

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

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

    Measure the resistance between terminal THO1 (OT) and body ground.

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

    Tech Tips

    If the circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 seconds). When P0713 is set, P0711 cannot be detected.

    It is not necessary to inspect the circuit when P0711 is set.

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)


    1. A01CE1UE01

      Remove the TCM from the transaxle.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      17 (E2) - 18 (THO1) Always 79 Ω to 156 kΩ
      17 (E2) - Body ground Always 10 kΩ or higher
      18 (THO1) - Body ground Always 10 kΩ or higher

      Tech Tips

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

      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

    INSPECT ATF TEMPERATURE SENSOR Click here

    OK

    REPLACE TCM Click here

  2. INSPECT ATF TEMPERATURE SENSOR


    1. A01CBIIE05

      Disconnect the ATF temperature sensor connector from the transmission wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E2 - THO1 Always 79 Ω to 156 kΩ
      E2 - Body ground Always 10 kΩ or higher
      THO1 - Body ground Always 10 kΩ or higher

      Tech Tips

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

      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

    REPLACE ATF TEMPERATURE SENSOR ASSEMBLY Click here

    OK

    REPLACE TRANSMISSION WIRE Click here