Toyota Tacoma (2015-2018) Service Manual: Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2tr-fe) / Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

DESCRIPTION

The No. 1 ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM.

The ECM applies a voltage to the temperature sensor through terminal THO1 of the ECM.

The sensor resistance changes with the ATF 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 ECM calculates the fluid temperature based on the voltage signal.

DTC No.	DTC Detection Condition	Trouble Area
P0712	The output voltage from the ATF temperature sensor is below 0.14 V for 0.5 sec. or more (1 trip detection logic).	Short in No. 1 ATF temperature sensor circuit No. 1 ATF temperature sensor (transmission wire) ECM
P0713	The output voltage from the ATF temperature sensor is higher than 4.91 V for 0.5 sec. or more, and either condition is met (1 trip detection logic): (A) 600 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. (B) 10 sec. or more have elapsed after the engine start when engine coolant temperature and intake air temperature are higher than -29.375°C (-20.875°F).	Open in No. 1 ATF temperature sensor circuit No. 1 ATF temperature sensor (transmission wire) ECM

DTC No.

DTC Detection Condition

Trouble Area

P0712

The output voltage from the ATF temperature sensor is below 0.14 V for 0.5 sec. or more (1 trip detection logic).

Short in No. 1 ATF temperature sensor circuit
No. 1 ATF temperature sensor (transmission wire)
ECM

P0713

The output voltage from the ATF temperature sensor is higher than 4.91 V for 0.5 sec. or more, and either condition is met (1 trip detection logic):

(A) 600 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.

(B) 10 sec. or more have elapsed after the engine start when engine coolant temperature and intake air temperature are higher than -29.375°C (-20.875°F).

Open in No. 1 ATF temperature sensor circuit
No. 1 ATF temperature sensor (transmission wire)
ECM

MONITOR DESCRIPTION

The No. 1 ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the No. 1 ATF temperature sensor circuit. If the resistance value of the No. 1 ATF temperature sensor is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the No. 1 ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.

*1: 150°C (302°F) or higher 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 voltage) P0713: ATF temperature sensor/Range check (High voltage)
Required sensors/Components	ATF temperature sensor (TFT sensor)
Frequency of operation	Continuous
Duration	0.5 sec.
MIL operation	Immediately
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All:

Battery voltage	8 V or more
Ignition switch	ON
Starter	OFF

P0712:

The monitor will run whenever the following DTCs are not stored

None

P0713:

Either condition is met: Condition (A) or (B)

Condition (A):

The monitor will run whenever the following DTCs are not stored	P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit fail) P00AC, P00AD, P0112, P0113 (IAT (Intake air temperature) sensor circuit fail)
Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start	-29.375°C (-20.875°F) or less
Time after engine start	600 sec. or more
ECT (Engine coolant temperature) sensor circuit fail (P0115, P0117, P0118) (Pending + MIL)	Not detected
IAT (Intake air temperature) sensor circuit fail (P00AC, P00AD, P0112, P0113) (Pending + MIL)	Not detected

Condition (B):

The monitor will run whenever the following DTCs are not stored	P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit fail) P00AC, P00AD, P0112, P0113 (IAT (Intake air temperature) sensor circuit fail)
Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start	Higher than -29.375°C (-20.875°F)
Time after engine start	10 sec. or more
ECT (Engine coolant temperature) sensor circuit fail (P0115, P0117, P0118) (Pending + MIL)	Not detected
IAT (Intake air temperature) sensor circuit fail (P00AC, P00AD, P0112, P0113) (Pending + MIL)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0712:

ATF temperature sensor voltage

(ATF temperature)

Below 0.14 V

(Higher than 164°C (327°F))

P0713:

ATF temperature sensor voltage

(ATF temperature)

Higher than 4.91 V

(Below -48°C (-54°F))

COMPONENT OPERATING RANGE

ATF temperature sensor voltage

(ATF temperature)

0.14 V or higher, and 4.91 V or less (-48°C (-54°F) or higher, and 164°C (327°F) or less)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).
Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Start the engine and wait for 10 minutes or more.
Check for DTCs again (See page ).

1. DATA LIST

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.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Data List.

(g) According to the display on the Techstream, read the Data List.

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
A/T Oil Temperature 1	No. 1 ATF temperature sensor value/ Min.: -40°C (-40°F) Max.: 150°C (302°F)	Approx. 80°C (176°F): After stall test Equal to ambient temperature when cold soak	If the value -40°C (-40°F) or 150°C (302°F), No. 1 ATF temperature sensor circuit is open or shorted.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

A/T Oil Temperature 1

No. 1 ATF temperature sensor value/

Min.: -40°C (-40°F)

Max.: 150°C (302°F)

Approx. 80°C (176°F): After stall test
Equal to ambient temperature when cold soak

If the value -40°C (-40°F) or 150°C (302°F), No. 1 ATF temperature sensor circuit is open or shorted.

HINT:

When DTC P0712 is output and the Techstream indicates 150°C (302°F) or higher, there is a short circuit.

When DTC P0713 is output and the Techstream indicates -40°C (-40°F), there is an open circuit.

Check the temperature displayed on the Techstream in order to check if a malfunction exists.

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

HINT:

If the circuit related to the No. 1 ATF temperature sensor becomes open, P0713 is immediately stored (in 0.5 seconds). When P0713 is stored, P0711 cannot be stored.

It is not necessary to inspect the circuit when P0711 is stored.

PROCEDURE

1.	INSPECT NO. 1 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE)

(a) Disconnect the E1 transmission wire connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (OT+) - 4 (OT-)	Always	79 Ω to 156 kΩ
3 (OT+) or 4 (OT-) - Body ground	Always	10 kΩ or higher

HINT:

If the resistance is out of the specified range at any of the ATF temperatures 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

Text in Illustration

*a	Component without harness connected (Transmission Wire)

REPLACE NO. 1 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE)

2.	CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E19-20 (THO1) - E19-21 (ETHO)	Always	79 Ω to 156 kΩ
E19-20 (THO1) - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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