Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

DESCRIPTION

The ATF temperature sensor converts the automatic transaxle fluid (ATF) 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 rises, the sensor resistance decreases.

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

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P071000	Transmission Fluid Temperature Sensor "A" Circuit Range/Performance	1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other DTC Detection Condition 1 Certain monitor enabling conditions are met. ATF temperature is less than 20°C (68°F). 3 seconds 2-trip detection logic DTC Detection Condition 2 Certain monitor enabling conditions are met. ATF temperature is 110°C (230°F) or higher 3 seconds 2-trip detection logic	Transmission wire (ATF temperature sensor) ATF temperature sensor circuit ECM	Comes on	DTC stored	SAE Code: P0711

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071000

Transmission Fluid Temperature Sensor "A" Circuit Range/Performance

1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other

DTC Detection Condition 1

Certain monitor enabling conditions are met.
ATF temperature is less than 20°C (68°F).
3 seconds
2-trip detection logic

DTC Detection Condition 2

Certain monitor enabling conditions are met.
ATF temperature is 110°C (230°F) or higher
3 seconds
2-trip detection logic

Transmission wire (ATF temperature sensor)
ATF temperature sensor circuit
ECM

Comes on

DTC stored

SAE Code:

P0711

MONITOR DESCRIPTION

This DTC indicates that there is a problem with the output signals from the ATF temperature sensor and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature into 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 malfunction of the ATF temperature sensor.

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

If the ATF temperature is 110°C (230°F) or higher and the engine coolant temperature takes 10 seconds or more to reach 60°C (140°F) after a cold start, the ECM also interprets this as a malfunction, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	P0711: ATF temperature sensor/Rationality check
Required sensors/Components	ATF temperature sensor (TFT 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 present

(Not circuit malfunction)

P0097, P0098, P0112, P0113 (IAT (Intake air temperature) sensor circuit)

P0717, P07BF, P07C0 (Turbine speed sensor circuit)

P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit)

P0335, P0337, P0338 (Crankshaft Position Sensor "A" circuit) (This condition applies only if using fail-safe)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P0798 (Shift solenoid valve SL3 circuit)

P2810 (Shift solenoid valve SL4 circuit)

P2819 (Shift solenoid valve SL5 circuit)

P0973, P0974 (Shift solenoid valve S1 circuit)

P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit)

P0712, P0713 (ATF temperature sensor circuit (TFT sensor))

P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D (KCS sensor circuit)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system)

U0100 (CAN communication system)

P2610 (Soak timer circuit)

Condition (A)

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	10 min. or more
Accumulated driving time *1	2 min. and 10 sec. or more
Driving distance after engine start*3	4.9 km (3.05 miles) or more
IAT*4	15°C (59°F) or higher
ECT (12 sec. after engine start) Duration	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
Time after engine start except for continuing shift position "N" or "P"*2	18 min. and 20 sec. or more
Accumulated driving time*1	3 min. and 20 sec. or more
Driving distance after engine start*3	8 km (4.97 miles) or more
IAT*4	-10°C (14°F) or more
ECT (12 sec. after engine start)	-10°C (14°F) or more

Condition (C):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	30 min. or more
Accumulated driving time*1	6 min. and 40 sec. or more
Driving distance after engine start*3	16 km (10 miles)
IAT*4	-15°C (5°F) or more
ECT (12 sec. after engine start)	-15°C (5°F) or more

Condition (D):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	55 min. or more
Accumulated driving time*1	12 min. and 30 sec. or more
Driving distance after engine start*3	27 km (16.78 miles)

Condition (E):

Any of the following conditions is met:
- Elapsed time for ECT to reach 60°C (140°F) or more	10 sec. or more
- Soak time	5 hours or more
ATF temperature (12 sec. after engine start)	110°C (230°F) or higher
ECT (12 sec. after engine start)	Below 50°C (122°F)

HINT:

*1: Following conditions are met

Engine speed - Turbine speed	50 rpm or more
Output speed	400 rpm or more
Throttle valve opening angle	3% or more
Shift position	Not "N" or "P"
Engine	Starting
However, Accumulated driving time is cleared when following condition met
Duration time from shift position "N" or "P"	300 sec. or more

*2: Time after engine start is cleared when following condition met

Duration time from shift position "N" or "P"

300 sec. or more

*3: Driving distance is cleared when following condition met

Duration time from shift position "N" or "P"

300 sec. or more

*4: IAT is measured when either of following conditions met

12 sec. after engine start
Duration time from shift position "N" or "P"	300 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

Either condition is met: Condition (A), (B), (C), (D) or (E)

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

ATF temperature

Below 20°C (68°F)

Condition (E)

ATF temperature

110°C (230°F) or higher

COMPONENT OPERATING RANGE

ATF temperature

20°C (68°F) or higher and below 110°C (230°F)

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 5 hours. [*1]
Turn the engine switch on (IG) and turn the Techstream on. [*2]
Start the engine and perform both of the following [*3]:
- Drive the vehicle 27 km (17 mile) or more over a period of 12 minutes and 30 seconds or more.
- Wait until 55 minutes or more have elapsed since the engine started.
  HINT:
  
  [*1] to [*3] : Normal judgment procedure.
  
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P071000.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs.
Click here
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here
If DTCs P071000, P261029 and/or P261093 are output simultaneously, using the Techstream, check if the ATF temperature is as specified under the "Normal Condition" column of the Data List. If the ATF temperature is as specified under the "Normal Condition" column, perform troubleshooting for DTC P261029.
Click here

DATA LIST

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.

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.

(a) Warm up the engine.

(b) Turn the engine switch off.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Data List / A/T Oil Temperature No.1.

(g) Read the Data List according to the display on the Techstream.

Powertrain > Transmission > Data List

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

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Temperature No.1

ATF temperature sensor value

Min.: -40°C (-40°F)

Max.: 150°C (302°F)

Approximately 80°C (176°F): After stall speed test
Equal to ambient temperature: When engine is cold

If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or shorted

Powertrain > Transmission > Data List

Tester Display
A/T Oil Temperature No.1

HINT:

If DTC P071011 is output and the Techstream indicates 150°C (302°F) or higher, there is a short in the circuit.
If DTC P071015 is output and the Techstream indicates -40°C (-40°F), the circuit is open.
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, P071015 will be stored in approximately 0.5 seconds. If DTC P071015 is stored, DTC P071000 cannot be detected. It is not necessary to inspect the circuit when P071000 is output.

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

PROCEDURE

1.	CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P071000)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

Result	Proceed to
Only DTC P071000 is output	A
DTC P071000 and P071015 are output	B
DTC P071000 and other DTCs are output	C

HINT:

If any DTCs other than DTC P071000 are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART (DTC P071015)

GO TO DTC CHART

2.	INSPECT AUTOMATIC TRANSAXLE FLUID LEVEL

(a) Check the automatic transaxle fluid level.

Click here

OK:

Automatic transaxle fluid level is correct.

ADJUST AUTOMATIC TRANSAXLE FLUID LEVEL

3.	CHECK TRANSMISSION WIRE CIRCUIT

(a) Disconnect the D2 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D2-86 (THO1) - D2-133 (ETHW)	ATF temperature 10°C (50°F)	5 to 8 kΩ
D2-86 (THO1) - D2-133 (ETHW)	ATF temperature 110°C (230°F)	0.22 to 0.28 kΩ
D2-133 (ETHW) - Body ground	Always	10 kΩ or higher
D2-86 (THO1) - Body ground	Always	10 kΩ or higher

HINT:

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

ATF Temperature	Specified Condition
25°C (77°F)	2.5 to 4.5 kΩ

GO TO STEP 5

4.	REPLACE ECM

(a) Replace the ECM.

Click here

PERFORM A/T CODE REGISTRATION

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

(a) Disconnect the D56 transmission wire connector.

(b) Disconnect the D2 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-8 (OIL) - D2-86 (THO1)	Always	Below 1 Ω
D56-9 (E2) - D2-133 (ETHW)	Always	Below 1 Ω
D56-8 (OIL) or D2-86 (THO1) - Body ground	Always	10 kΩ or higher
D56-9 (E2) or D2-133 (ETHW) - Body ground	Always	10 kΩ or higher

REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)

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