Toyota Venza: Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

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)	Short in ATF temperature sensor circuit Transmission wire ATF temperature sensor TCM
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):	Open in ATF temperature sensor circuit Transmission wire ATF temperature sensor TCM
	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

ALL

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

P0712: Range check (Low voltage)

The monitor will run whenever these DTCs are not present.

None

P0713: Range check (High voltage)

One of the following conditions is met: Condition (A) or (B) Condition (A)

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

Condition (B)

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)

P0713: Range check (High voltage)

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.

Warm up the engine.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / ECT / Data List.

According to the display on the Techstream, 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)	After stall speed test: Approximately 80°C (176°F) 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

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)

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

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

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

REPLACE TRANSMISSION WIRE

REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

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Battery voltage	8 V or more
Ignition switch	ON
Starter	OFF