AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0710/38, P0712/38, P0713/38

DTC Code	DTC Name
P0710/38	Transmission Fluid Temperature Sensor "A" Circuit
P0712/38	Transmission Fluid Temperature Sensor "A" Circuit Low Input
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 Engine Control Module (ECM).

The ECM applies a voltage to the temperature sensor through ECM 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 ECM calculates the ATF based on the voltage signal.

DTC No.	DTC Detection Condition	Trouble Area
P0710/38	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): (a) ATF temperature sensor resistance is less than 79 Ω (b) ATF temperature sensor resistance is more than 156 kΩ	Open or short in ATF temperature sensor circuit ATF temperature sensor ECM
P0712/38	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 ATF temperature sensor ECM
P0713/38	ATF temperature sensor resistance is more than 156 kΩ for 15 minutes or more after the engine starts DTC is detected for 0.5 sec. or more (1 trip detection logic)	Open in ATF temperature sensor circuit ATF temperature sensor ECM

DTC No.

DTC Detection Condition

Trouble Area

P0710/38

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):

(a) ATF temperature sensor resistance is less than 79 Ω

(b) ATF temperature sensor resistance is more than 156 kΩ

Open or short in ATF temperature sensor circuit
ATF temperature sensor
ECM

P0712/38

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
ATF temperature sensor
ECM

P0713/38

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

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

Open in ATF temperature sensor circuit
ATF temperature sensor
ECM

MONITOR DESCRIPTION

ATF temperature sensor converts 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 less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and store the DTC.

Tech Tips

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

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Using the intelligent tester's Data List 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.

Warm up the engine.
Turn the ignition switch OFF.
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and push the tester main switch ON.
Enter the following menus: Powertrain / Engine and ECT / Data List.
Follow the instructions on the tester and read the Data List.

Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
A/T Oil Temperature 3	ATF temperature sensor value/ Min.: -40°C (-40°F) Max.: 215°C (419°F)	After stall test: Approximately 80°C (176°F) Equal to ambient temperature during engine is cold	If value is -40°C (-40°F) or 215°C (419°F), ATF temperature sensor circuit is open or short circuited

Item

Measurement Item/

Range (Display)

Normal Condition

Diagnostic Note

A/T Oil Temperature 3

ATF temperature sensor value/

Min.: -40°C (-40°F)

Max.: 215°C (419°F)

After stall test:

Approximately 80°C (176°F)
Equal to ambient temperature during 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.

Tech Tips

When DTC P0712/38 is output and the intelligent tester output is 150°C (302°F) or more, there is a short circuit.
When DTC P0713/38 is output and the intelligent tester output is -40°C (-40°F), there is an open circuit.

Measure the resistance between terminal THOC and body ground.

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

PROCEDURE

INSPECT ATF TEMPERATURE SENSOR

Disconnect the A3 ATF temperature sensor connector from the transmission.

Measure the resistance of the temperature sensor.

Standard resistance

Tester Connection	Specified Condition
1 - 2	79 Ω to 156 kΩ
1 - Body ground	1 MΩ or higher
2 - Body ground	1 MΩ or higher

Tech Tips

If the resistance is not within the specified range for 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
110°C (230°F)	0.68 to 0.88 kΩ

REPLACE ATF TEMPERATURE SENSOR

CHECK WIRE HARNESS (ATF TEMPERATURE SENSOR - ECM)

Disconnect the E11 ECM connectors.

Measure the resistance of the wire harness side connector.

Standard resistance

Tester Connection	Specified Condition
E11-22 (THOC) - E11-28 (E2)	79 Ω to 156 kΩ
E11-22 (THOC) - Body ground	10 kΩ or higher
E11-28 (E2) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE ECM