Toyota 4Runner: Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

DESCRIPTION

Refer to DTC P0711 (See page
).

DTC Code	DTC Detection Condition	Trouble Area
P0712	ATF temperature sensor resistance is below 79 Ω 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	ATF temperature sensor resistance is higher than 156 kΩ for 0.5 sec. or more and either condition is met (1-trip detection logic): (A) 550 sec. or more have elapsed after the engine start when the 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 the 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 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 ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF temperature sensor or wiring. The ECM will illuminate the MIL and store the DTC.

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
Frequency of operation	Continuous
Duration	0.5 sec.
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

Battery voltage	8 V or higher
Ignition switch	ON
Starter	OFF

P0712: Range Check (Low Voltage)

The monitor will run whenever this DTC is not stored

None

TYPICAL MALFUNCTION THRESHOLDS

P0712: Range Check (Low Voltage)

ATF temperature sensor voltage [ATF temperature]

Less than 0.14 V [Higher than 164°C (327°F)]

P0713: Range Check (High Voltage)

ATF temperature sensor voltage [ATF temperature]

More than 4.91 V [Below -48°C (-54°F)]

COMPONENT OPERATING RANGE

ATF temperature sensor voltage [ATF temperature]

0.14 to 4.91 V [-48°C (-54°F) to 164°C (327°F)]

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (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.

(c) Connect the Techstream to the DLC3.

(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.: 215°C (419°F)	After stall test: Approximately 80°C (176°F) With engine cold: Equal to ambient temperature	If the value is -40°C (-40°F) or 215°C (419°F), the No. 1 ATF temperature sensor circuit is open or shorted.

HINT:

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

When DTC P0713 is output and the Techstream output is -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

If a circuit related to the 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 TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)

(a) Disconnect the B32 transmission wire connector.

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

Standard Resistance:

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

HINT:

If the resistance is out of the specified range at one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.

Resistance (Reference):

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)

NG

REPAIR OR REPLACE NO. 1 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE)

OK

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

(a) Disconnect the B37 and B38 ECM connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B38-5 (THO1) - B37-8 (ETHW)	Always	79 Ω to 156 kΩ
B38-5 (THO1) - Body ground	Always	10 kΩ or higher
B37-8 (ETHW) - Body ground	Always	10 kΩ or higher

Text in Illustration

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

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR