Dtc P0710/38 Transmission Fluid Temperature Sensor A Circuit


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ATF TEMPERATURE SENSOR

CHECK WIRE HARNESS (ATF TEMPERATURE SENSOR - TCM)

DTC P0710/38 Transmission Fluid Temperature Sensor "A" Circuit

DTC P0712/38 Transmission Fluid Temperature Sensor "A" Circuit Low Input

DTC P0713/38 Transmission Fluid Temperature Sensor "A" Circuit High Input


DESCRIPTION

The Automatic Transmission Fluid (ATF) temperature sensor converts the ATF temperature into a resistance value which is input into the Transmission Control Module (TCM).
The TCM applies a voltage to the temperature sensor through TCM terminal THOC.
The sensor resistance changes with the ATF temperature.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.
The TCM calculates the ATF temperature based on the voltage signal.

DTC Code
DTC Detection Condition
Trouble Area
P0710/38
  1. ATF temperature sensor resistance changes from (a) to (b) or from (b) to (a) in less than 0.5 sec., and P0712/38 and P0713/38 are not detected (1 trip detection logic):
    1. ATF temperature sensor resistance is less than 79 Ω
    2. ATF temperature sensor resistance is more than 156 kΩ
  1. Open or short in ATF temperature sensor circuit
  2. ATF temperature sensor
  3. TCM
P0712/38
ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1 trip detection logic)
  1. Short in ATF temperature sensor circuit
  2. ATF temperature sensor
  3. TCM
P0713/38
ATF temperature sensor resistance is more than 156 kΩ for 15 minutes or more after the engine starts (1 trip detection logic)
  1. Open in ATF temperature sensor circuit
  2. ATF temperature sensor
  3. TCM

MONITOR DESCRIPTION

The ATF temperature sensor converts ATF temperature to 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 sensor 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 illuminate the MIL and store the DTC.
HINT:
  1. *1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
  2. *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
  3. The ATF temperature can be checked on the intelligent tester display.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.A340E Automatic Transmission.Automatic Transmission System. Dtc P0710/38 Transmission Fluid Temperature Sensor A Circuit


INSPECTION PROCEDURE

HINT:
Using the Data List of the intelligent tester allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time.
  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 and push the tester main switch on.
  5. Enter the following menus: Powertrain / ECT / Data List.
  6. Follow the instructions on the tester and read the Data List.

Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
A/T Oil Temperature 3
ATF temperature sensor value/
Min.: -40°C (-40°F)
Max.: 215°C (419°F)
  1. After stall test:
    Approximately 80°C (176°F)
  2. Equal to ambient temperature while engine is cold
If value is -40°C (-40°F) or 215°C (419°F), ATF temperature sensor circuit is open or short circuited
CAUTION:
In the table above, 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.
HINT:
  1. When DTC P0712/38 is output and the intelligent tester output is 150°C (302°F) or more, there is a short circuit.
  2. When DTC P0713/38 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 more
Short circuit
1.INSPECT ATF TEMPERATURE SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.A340E Automatic Transmission.Automatic Transmission System. Dtc P0710/38 Transmission Fluid Temperature Sensor A Circuit

  1. Disconnect the A3 ATF temperature sensor connector from the transmission.

  1. Measure the resistance of the temperature sensor.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Always
    		79 Ω to 156 kΩ
    1 - Body ground
    		Always
    		1 MΩ or higher
    2 - Body ground
    		Always
    		1 MΩ or higher
    HINT:
    If the resistance is not within 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 ATF TEMPERATURE SENSOR
OK


2.CHECK WIRE HARNESS (ATF TEMPERATURE SENSOR - TCM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.A340E Automatic Transmission.Automatic Transmission System. Dtc P0710/38 Transmission Fluid Temperature Sensor A Circuit

  1. Disconnect the T19 TCM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T19-24 (THOC) - T19-23 (E2)
    		Always
    		79 Ω to 156 kΩ
    T19-24 (THOC) - Body ground
    		Always
    		10 kΩ or higher
    T19-23 (E2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TCM