Toyota 4Runner: Transmission Fluid Temperature Sensor "A" Performance (P0711)

DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor converts the ATF temperature into a resistance value which is input into the ECM.

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

The sensor resistance changes with the ATF temperature.

One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.

The ECM calculates the ATF temperature based on the voltage signal.

DTC Code	DTC Detection Condition	Trouble Area
P0711	One of the following conditions (A), (B), (C), (D) or (E) is met: (A) (a), (b) and (c) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are 15°C (59°F) or higher at engine start. (b) After normal driving for over 16 min. and 40 sec. and 7.5 km (4.7 miles) or more, ATF temperature is below 20°C (68°F). (c) Soak time is 5 hours or more. (B) Both (a) and (b) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are -10°C (14°F) or higher at engine start. (b) After normal driving for over 21 min. and 40 sec. and 9 km (5.6 miles) or more, ATF temperature is below 20°C (68°F). (C) Both (a) and (b) are detected: (2-trip detection logic) (a) Intake air and engine coolant temperatures are -15°C (5°F) or higher at engine start. (b) After normal driving for over 30 min. and 16 km (9.9 miles) or more, ATF temperature is below 20°C (68°F). (D) After normal driving for over 55 min. and 27 km (16.8 miles) or more, ATF temperature is below 20°C (68°F). (2-trip detection logic) (E) Both (a) and (b) are detected: (2-trip detection logic) (a) Engine coolant temperature is below 35°C (95°F) at engine start. (b) ATF temperature is 95°C (203°F) or higher when engine coolant temperature reaches 60°C (140°F).	No. 1 ATF temperature sensor (transmission wire)

MONITOR DESCRIPTION

This DTC indicates that there is a problem with the output from the Automatic Transmission Fluid (ATF) temperature sensor and that the sensor itself is defective. 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 or a fault in the ATF temperature sensor.

After driving the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the ECM interprets this as a fault, turns on the MIL and stores the DTC.

When the ATF temperature is 95°C (203°F) or higher and the engine coolant temperature reaches 60°C (140°F) after a cold start, the ECM also determines this as a fault, turns on the MIL and stores the DTC.

MONITOR STRATEGY

Related DTCs	P0711: ATF temperature sensor/Rationality fault diagnostics
Required sensors/Components	ATF temperature sensor
Frequency of operation	Continuous
Duration	3 sec.
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored

P0712, P0713, P2740, P2742, P2743 (ATF temperature sensor "A" circuit) P0128 (ECT (Engine Coolant Temperature) sensor circuit) P0111, P0112, P0113, P011B, (IAT (Intake Air Temperature) sensor circuit)

Condition (A)

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Permission flag for ATF temperature rationality check	ON
Time after engine start	16 min. and 40 sec. or more
Accumulated driving time*	4 min. and 50 sec. or more
Driving distance after engine start	7.5 km (4.7 miles) or more
ECT (12 sec. after engine start)	15°C (59°F) or higher
IAT (12 sec. after engine start)	15°C (59°F) or higher
Soak time	5 hours or more

Condition (B)

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Permission flag for ATF temperature rationality check	ON
Time after engine start	21 min. and 40 sec. or more
Accumulated driving time*	6 min. or more
Driving distance after engine start	9 km (5.6 miles) or more
ECT (12 sec. after engine start)	-10°C (14°F) or higher
IAT (12 sec. after engine start)	-10°C (14°F) or higher

Condition (C)

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Permission flag for ATF temperature rationality check	ON
Time after engine start	30 min. or more
Accumulated driving time*	6 min. and 40 sec. or more
Driving distance after engine start	16 km (9.9 miles) or more
ECT (12 sec. after engine start)	-15°C (5°F) or higher
IAT (12 sec. after engine start)	-15°C (5°F) or higher

Condition (D)

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Permission flag for ATF temperature rationality check	ON
Time after engine start	55 min. or more
Accumulated driving time*	12 min. and 30 sec. or more
Driving distance after engine start	27 km (16.8 miles) or more

Condition (E)

Duration time for ECT to reach 60°C (140°F)	10 sec. or more
ATF temperature (12 sec. after engine start)	95°C (203°F) or higher
ECT (12 sec. after engine start)	Below 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

Condition (A), (B), (C) and (D)

ATF temperature

Below 20°C (68°F)

Condition (E)

ATF temperature

95°C (203°F) or higher

COMPONENT OPERATING RANGE

All

ATF temperature

20°C (68°F) or higher, and below 95°C (203°F)

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.	CHECK DTC OUTPUT (IN ADDITION TO DTC P0711)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result

Result	Proceed to
Only P0711 is output	A
P0711 and other DTCs are output	B

HINT:

If any other codes besides P0711 are output, perform troubleshooting for those DTCs first.

B

GO TO DTC CHART

A

2.	CHECK TRANSMISSION FLUID LEVEL

(a) Check the transmission fluid level (See page ).

OK:

Automatic transmission fluid level is correct.

OK

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

NG

ADD FLUID