A750E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Drivetrain	Section: Automatic Transmission/Transaxle
Model Year: 2008	Model: Sequoia	Doc ID: RM000000W7Z07AX
Title: A750E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0711

Transmission Fluid Temperature Sensor "A" Performance

DESCRIPTION

Refer to DTC P0710 .

DTC No.

DTC Detection Condition

Trouble Area

P0711

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

Condition (A):

Both (a) and (b) are detected: (2-trip detection logic)

(a) Intake air and engine coolant temperatures are more than -10°C (14°F) at engine start.

(b) After normal driving for 21 minutes and 40 seconds or more and 9 km (5.6 miles) or more, ATF temperature is less than 20°C (68°F).

Condition (B):

Both (a) and (b) are detected (2-trip detection logic)

(a) Engine coolant temperature is less than 35°C (95°F) at engine start.

(b) ATF temperature is 110°C (230°F) or more when engine coolant temperature reaches 60°C (140°F).

Transmission wire (No. 1 ATF temperature sensor)

MONITOR DESCRIPTION

This DTC indicates that there is a problem with 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 circuit or a fault in the ATF temperature sensor.

After running 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 110°C (230°F) or more and engine coolant temperature reaches 60°C (140°F) after 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 check
Required sensors/Components	ATF temperature sensor
Frequency of operation	Continuous
Duration	Condition (A): 3 seconds Condition (B): 10 seconds
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not present	None
ATF temperature sensor "A" circuit	Not circuit malfunction
ECT (Engine coolant temperature) sensor circuit	Not circuit malfunction
IAT (Intake air temperature) sensor circuit	Not circuit malfunction

Condition (A)

Duration time from engine start	21 minutes and 40 seconds or more
Time after engine start	21 minutes and 40 seconds
Driving distance after engine start	9 km (5.6 miles) or more
IAT (12 seconds after engine start)	-10°C (14°F) or more
ECT (12 seconds after engine start)	-10°C (14°F) or more

Condition (B)

Duration time from ECT each to 60°C (140°F)	10 seconds or more
ATF temperature (12 seconds after engine start)	110°C (230°F) or more
ECT (12 seconds after engine start)	Less than 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

Condition (A)

ATF temperature

Less than 20°C (68°F) (ATF temperature = -10°C (14°F) at engine start)

(Conditions vary with ATF temperature at engine start)

Condition (B)

ATF temperature

110°C (230°F) or more

COMPONENT OPERATING RANGE

Condition (A)

ATF temperature

20°C (68°F) or more (ATF temperature = -10°C (14°F) at engine start)

(Conditions vary with ATF temperature at engine start)

Condition (B)

ATF temperature

Less than 110°C (230°F)

WIRING DIAGRAM

Refer to DTC P0710 .

INSPECTION PROCEDURE

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 / ECT / Data List.

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

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)
Equal to ambient temperature while engine is cold

If value is -40°C (-40°F) or 215°C (419°F), 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 more, there is a short circuit.

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

Measure the resistance between terminal THO1 and the body ground.

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

If a 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.	CHECK DTC OUTPUT (IN ADDITION TO DTC P0711)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / 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.

2.	CHECK TRANSMISSION FLUID LEVEL

(a) Check the transmission fluid level .

OK:

Automatic transmission fluid level is correct.