Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000000W7Z03CX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0711; Transmission Fluid Temperature Sensor "A" Performance; 2007 MY LX470 [08/2006 -        ]

DTC

P0711

Transmission Fluid Temperature Sensor "A" Performance

DESCRIPTION

Refer to DTC P0710 2007 MY LX470 [08/2006 -        ]; A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0710,P0712,P0713; Transmission Fluid Temperature Sensor "A" Circuit+ .

DTC No.

DTC Detection Condition

Trouble Area

P0711
  • Both (a) and (b) are detected (2 trip detection logic):
    1. Intake air and engine coolant temperatures are more than -15°C (5°F) at engine start
    2. After normal driving for over 320 sec. and 9 km (5.6 miles) or more, ATF temperature is less than 20°C (68°F)

No. 1 ATF temperature sensor

MONITOR DESCRIPTION

This DTC indicates that there is a problem with output from the 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 opens or shorts 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 10°C (50°F) after running the vehicle for a certain period, the ECM interprets this as a fault, and illuminates the MIL.

MONITOR STRATEGY

Related DTCs

P0711: ATF temperature sensor/Rationality check

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

The monitor will run whenever this DTC is not present.

None

ATF temperature "A" circuit

Not circuit malfunction

ECT (Engine coolant temperature) sensor circuit

Not circuit malfunction

IAT (Intake air temperature) sensor circuit

Not circuit malfunction

Duration time from engine start

21 min. and 40 sec. or more

ECT

-15°C (5°F) or more

Time after engine start

21 min. and 40 sec.

Driving distance after engine start

9 km (5.6 miles) or more

IAT (12 sec. after engine start)

-10°C (14°F) or more

ECT (12 sec. after engine start)

-10°C (14°F) or more

TYPICAL MALFUNCTION THRESHOLDS

ATF temperature

Less than 20°C (68°F)

(Conditions vary with ATF temperature at engine start)

WIRING DIAGRAM

Refer to DTC P0710 2007 MY LX470 [08/2006 -        ]; A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0710,P0712,P0713; Transmission Fluid Temperature Sensor "A" Circuit+ .

INSPECTION PROCEDURE

HINT:

Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save 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.

  1. Warm up the engine.
  2. Turn the ignition switch OFF.
  3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
  4. Turn the ignition switch ON.
  5. Turn the intelligent tester ON.
  6. Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.
  7. Follow the instructions on the tester and read the DATA LIST.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

A/T OIL TEMP1

ATF temperature sensor No. 1 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), ATF temperature sensor No. 1 circuit is opened or short circuited

HINT:

  • When DTC P0712 is output and the intelligent tester output is 150°C (302°F) or more, there is a short circuit.
  • When DTC P0713 is output and the intelligent tester output is -40°C (-40°F), there is an open circuit.

    Measure the resistance between terminal THO1 (OT) and the body ground.

Temperature Displayed

Malfunction

-40°C (-40°F)

Open circuit

150°C (302°F) or more

Short circuit

HINT:

If a circuit related to the ATF temperature sensor becomes open, P0713 is set in approximately 0.5 seconds. It is not necessary to inspect the circuit when P0711 is set.

PROCEDURE

1.

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0711)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and push the intelligent tester main switch ON.

(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(d) Read the DTCs using the intelligent tester.

Display (DTC output)

Proceed to

Only P0711 is output

A

P0711 and other DTCs

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

OK:

Automatic transmission fluid level is correct.

NG

ADD FLUID

OK

REPLACE TRANSMISSION WIRE