Lexus ES: Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open (P071015)

Lexus ES (XZ10) Service Manual / Drivetrain / Ub80f (automatic Transmission / Transaxle) / Automatic Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open (P071015)

DESCRIPTION

The ATF temperature sensor converts the automatic transaxle fluid (ATF) temperature into a resistance value for use by the ECM.

The ECM applies 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
P071015	Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open	The ATF temperature sensor voltage is more than 4.915 V for 0.5 seconds when either of the following conditions is met (1-trip detection logic): 600 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were -29.375°C (-20.875°F) or less at engine start). 10 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were higher than -29.375°C (-20.875°F) at engine start).	Open or short to +B in ATF temperature sensor circuit Transmission wire (ATF temperature sensor) ECM	Comes on	DTC stored	SAE Code: P0713

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071015

Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open

The ATF temperature sensor voltage is more than 4.915 V for 0.5 seconds when either of the following conditions is met (1-trip detection logic):

600 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were -29.375°C (-20.875°F) or less at engine start).
10 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were higher than -29.375°C (-20.875°F) at engine start).

Open or short to +B in ATF temperature sensor circuit
Transmission wire (ATF temperature sensor)
ECM

Comes on

DTC stored

SAE Code:

P0713

DTC Detection Condition Patterns:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	600 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were -29.375°C (-20.875°F) or less at engine start).	○	-
Diagnostic Condition	10 seconds or more have elapsed since engine start (engine coolant temperature and intake air temperature were higher than -29.375°C (-20.875°F) at engine start).	-	○
Malfunction Condition	ATF temperature sensor voltage is more than 4.915 V	○	○
Duration		0.5 seconds or more	0.5 seconds or more
Detection Logic		1-trip detection logic	1-trip detection logic

HINT:

This DTC is stored when either of the above detection patterns is met.

MONITOR DESCRIPTION

This DTC indicates an open or short to +B in the ATF temperature sensor circuit. The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and can detect an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is higher than 156 kΩ*, the ECM interprets this as a malfunction of the ATF temperature sensor or in the wire harness, illuminates the MIL and stores this DTC.

*: -40°C (-40°F) is indicated regardless of the actual ATF temperature.

HINT:

The ATF temperature can be checked in the Data List.

MONITOR STRATEGY

Related DTCs	P0713: ATF temperature sensor/Range check (High voltage)
Required sensors/components	ATF temperature sensor (TFT sensor)
Frequency of operation	Continuous
Duration	0.5 seconds
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored	P0117, P0118: ECT (Engine coolant temperature) sensor circuit P0112, P0113: IAT (Intake air temperature) sensor circuit
Battery voltage	8 V or more
Engine switch	On (IG)
Starter	OFF
ECT sensor circuit fail (P0117, P0118) (Pending / MIL)	Not detected
IAT sensor circuit fail (P0112, P0113) (Pending / MIL)	Not detected

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

Condition (A)

Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start	-29.375°C (-20.875°F) or less
Time after engine start	600 seconds or more

Condition (B)

Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start	Higher than -29.375°C (-20.875°F)
Time after engine start	10 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

TFT sensor voltage

(ATF temperature)

More than 4.915 V

(Less than -48°C (-54°F))

COMPONENT OPERATING RANGE

ATF temperature sensor (TFT sensor) resistance

79 Ω to 156 kΩ

CONFIRMATION DRIVING PATTERN

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 2 minutes or more.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine.
Wait for 10 minutes or more with the engine running. [*1]
HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P071015.

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

Refer to DTC P071000.

Click here

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

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.	INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)

(a) Disconnect the C30 transmission wire connector.

*a	Component without harness connected (Transmission Wire)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (OIL) - 2 (E2)	Always	79 Ω to 156 kΩ
1 (OIL) or 2 (E2) - Other terminals	Always	10 kΩ or higher

HINT:

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

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

REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)

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

(a) Disconnect the C78 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C78-46 (THO1) - C78-45 (ETHO)	Always	79 Ω to 156 kΩ
C78-46 (THO1) or C78-45 (ETHO) - Other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE ECM

(a) Replace the ECM.

Click here

PERFORM REGISTRATION

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Lexus ES: Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open (P071015)

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