DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.
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): 5 minutes and 45 sec. 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.
HINT:
The ATF temperature can be checked on the Techstream display.
MONITOR STRATEGY
Related DTCs |
P0712: ATF temperature sensor/Range check (Low resistance) P0713: ATF temperature sensor/Range check (High resistance) |
Required sensors/Components |
ATF temperature sensor (TFT sensor) |
Frequency of operation |
Continuous |
Duration |
0.5 sec. |
MIL operation |
Immediate |
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
Battery voltage |
8 V or more |
Ignition switch |
ON |
Starter |
OFF |
The monitor will run whenever these DTCs are not present. |
None |
Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start |
-29.375°C (-20.875°F) or less |
Time after engine start |
5 min. and 45 sec. or more |
ECT sensor circuit fail (P0115, P0117, P0118) |
Not detected |
IAT sensor circuit fail (P0097, P0098, P0110, P0112, P0113) |
Not detected |
Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start |
More than -29.375°C (-20.875°F) |
Time after engine start |
10 seconds or more |
ECT sensor circuit fail (P0115, P0117, P0118) |
Not detected |
IAT sensor circuit fail (P0097, P0098, P0110, P0112, P0113) |
Not detected |
TYPICAL MALFUNCTION THRESHOLDS
P0712: Range check (Low voltage)
TFT sensor voltage (ATF temperature) |
Less than 0.14 V Higher than 164°C (327°F) |
TFT sensor voltage (ATF temperature) |
Higher than 4.91 V Less than -48°C (-54°F) |
COMPONENT OPERATING RANGE
ATF (TFT ) sensor resistance |
79 to 156 kΩ |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
).
HINT:
Using the Techstream 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.
NOTICE:
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.
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) |
|
If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or short circuited |
HINT:
When DTC P0712 is output and the Techstream indicates 150°C (302°F) or more, there is a short circuit.
When DTC P0713 is output and the Techstream 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 |
HINT:
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) |
(a) Remove the TCM from the transaxle. |
|
(b) 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 |
HINT:
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 |
|
2. |
INSPECT ATF TEMPERATURE SENSOR |
(a) Disconnect the ATF temperature sensor connector from the transmission wire. |
|
(b) 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 |
HINT:
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 |
NG | ![]() |
REPLACE ATF TEMPERATURE SENSOR ASSEMBLY |
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