AUTOMATIC TRANSMISSION 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 ATF (Automatic Transmission Fluid) temperature sensor converts the ATF temperature into a resistance value which is input into the ECM.

The No. 2 Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline.

Tech Tips

The temperature of the ATF easily rises when towing, climbing hills, in traffic, etc.

Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table below.

No. 2 ATF Temperature Sensor State Detection Condition Symptom Recovery Condition
Sensor is normal ATF temperature higher than 130°C (266°F) Shift point too low ATF temperature below 125°C (257°F)

When conditions (a) and (b) are satisfied:

(a) ATF temperature higher than 130°C (266°F)

(b) Engine coolant temperature higher than 98°C (208°F)

 Lock-up in 4th or 3rd gear* ATF temperature below 110°C (230°F) and engine coolant temperature below 98°C (208°F)
Sensor is short-circuited Any conditions Shift point too low Symptoms still occur
Engine coolant temperature higher than 95°C (203°F) Lock-up in 4th or 3rd gear* Symptoms still occur

Tech Tips

*: When the ATF temperature is normal, transmission lock-up occurs in 4th gear with the shift lever in D and in 3rd gear with the shift lever in 3.

DTC Code DTC Detection Condition Trouble Area
P0712 No. 2 ATF temperature sensor resistance is below 79 Ω for 0.5 sec. or more (1-trip detection logic).

  • Short in No. 2 ATF temperature sensor circuit

  • No. 2 ATF temperature sensor

  • ECM
P0713 When 15 minutes or more have elapsed after the engine is started, No. 2 ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more (1-trip detection logic).

  • Open in No. 2 ATF temperature sensor circuit

  • No. 2 ATF temperature sensor

  • ECM

MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature sensor is below 79 Ω or higher than 156 kΩ, the ECM interprets this as a fault in the ATF sensor or wiring. The ATF temperature warning light blinks and the ECM stores the DTC.

WIRING DIAGRAM

A01DON2E01

INSPECTION PROCEDURE


  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 / Engine and ECT / Data List.

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

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Temperature 3

      No. 2 ATF temperature sensor value/

      Min.: -40°C (-40°F)

      Max.: 150°C (302°F)

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

      • Equal to ambient temperature when engine cold

      		 If the value is -40°C (-40°F) or 150°C (302°F), the No. 2 ATF temperature sensor circuit is open or shorted.

      Tech Tips

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

      When DTC P0713 is output 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).

PROCEDURE


  1. INSPECT NO. 2 ATF TEMPERATURE SENSOR


    1. A01DOB9E01
      Text in Illustration
      *a

      Component without harness connected

      (No. 2 ATF Temperature Sensor)

      Disconnect the C60 No. 2 ATF temperature sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 79 Ω to 156 kΩ
      1 - Body ground Always 10 kΩ or higher
      2 - Body ground Always 10 kΩ or higher

      Tech Tips

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

      Standard Resistance
      ATF Temperature Specified Condition
      20°C (68°F) 10.3 to 13.9 kΩ
      120°C (248°F) 0.58 to 0.65 kΩ

    NG

    REPLACE NO. 2 ATF TEMPERATURE SENSOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 2 ATF TEMPERATURE SENSOR - ECM)


    1. A01DNPOE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the C61 and C62 ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C61-2 (THOC) - C62-16 (E2) Always 79 Ω to 156 kΩ
      C61-2 (THOC) - Body ground Always 10 kΩ or higher
      C62-16 (E2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here