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.
| *1 | Resistance |
| *2 | Acceptable range |
| *3 | Temperature |
The TCM applies a voltage to the temperature sensor through terminal THO1 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) |
|
| P0713 | ATF temperature sensor resistance is more than 156 kΩ for 0.5 seconds or more. Either of the following conditions is met (1 trip detection logic): |
|
| Condition (A): 394 seconds or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. | ||
| Condition (B): 10 seconds or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (- 20.875°F). |
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 GTS display.
WIRING DIAGRAM
| *1 | ATF Temperature Sensor |
| *2 | Transaxle Assembly |
CAUTION / NOTICE / HINT
Tech Tips
Using the GTS 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.
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Warm up the engine.
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Turn the engine switch off.
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Connect the GTS to the DLC3.
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Turn the engine switch on (IG).
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Turn the GTS on.
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Enter the following menus: Powertrain / ECT / Data List.
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According to the display on the GTS, 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)
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After stall speed test: Approximately 80°C (176°F)
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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 GTS indicates 150°C (302°F) or more, there is a short circuit.
When DTC P0713 is output and the GTS 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.
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PROCEDURE
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INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)
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Text in Illustration *a Component without harness connected
(Transmission Wire)
Remove the TCM from the transaxle.
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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 and other terminals Always 10 kΩ or higher 18 (THO1) - Body ground and other terminals 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
OK 
REPLACE TCM Click here
NG 
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INSPECT ATF TEMPERATURE SENSOR
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Disconnect the ATF temperature sensor connector from the transmission wire.
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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 and other terminals Always 10 kΩ or higher THO1 - Body ground and other terminals 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
OK
REPLACE TRANSMISSION WIRE Click here
NG
REPLACE ATF TEMPERATURE SENSOR ASSEMBLY Click here
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