Toyota Corolla Cross: Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120 (cvt) / Continuously Variable Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

DESCRIPTION

The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is detected by the TCM.

The sensor resistance changes with the CVT fluid temperature. As the temperature rises, the sensor resistance decreases. The TCM applies voltage to the temperature sensor through TCM terminal THO1 and calculates the fluid temperature based on the voltage signal.

HINT:

The CVT fluid temperature is likely to increase under conditions such as towing, climbing hills and in traffic.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P071000	Transmission Fluid Temperature Sensor "A" Circuit Range/Performance	Either of the following conditions is met (2-trip detection logic): The intake air and engine coolant temperatures were more than -10°C (14°F) at engine start, and the CVT fluid temperature is less than 20°C (68°F) for 3 seconds when the vehicle has been driven for over 18 minutes and 7 km (4 miles). The engine coolant temperature was less than 35°C (95°F) at engine start, and the CVT fluid temperature is 100°C (212°F) or more for 10 seconds.	CVT fluid level Transmission wire (CVT fluid temperature sensor)	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

Either of the following conditions is met (2-trip detection logic):

The intake air and engine coolant temperatures were more than -10°C (14°F) at engine start, and the CVT fluid temperature is less than 20°C (68°F) for 3 seconds when the vehicle has been driven for over 18 minutes and 7 km (4 miles).
The engine coolant temperature was less than 35°C (95°F) at engine start, and the CVT fluid temperature is 100°C (212°F) or more for 10 seconds.

CVT fluid level
Transmission wire (CVT fluid temperature sensor)

Comes on

DTC stored

SAE Code:

P0711

MONITOR DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the TCM determines the CVT fluid temperature and detects an open or short circuit in the CVT fluid temperature circuit.

After driving the vehicle for a certain amount of time, the CVT fluid temperature should increase. If the CVT fluid temperature remains below 20°C (68°F), the TCM interprets this as a malfunction, stores a DTC and illuminates the MIL.

When the engine coolant temperature reaches 35°C (95°F) after a cold engine start, if the CVT fluid temperature is 100°C (212°F) or more, the TCM interprets this as a malfunction, illuminates the MIL, and stores this DTC.

MONITOR STRATEGY

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

TYPICAL ENABLING CONDITIONS

ALL

ETC system

(Electronic throttle control system)

Not system down

(MIL illuminated by following codes: P0121, P0122, P0123, P0222, P0223, P0604, P0606, P0607, P060D, P060E, P0657, P0658, P1607, P16B0, P2102, P2103, P2111, P2112, P2119, P2135)

KCS sensor circuit

(Knock sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0327, P0328)

ECT sensor circuit

(Engine coolant temperature sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0117, P0118)

IAT sensor circuit

(Intake air temperature sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0112, P0113)

Transmission fluid temperature sensor "A" circuit

(CVT fluid temperature sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0712, P0713)

Turbine speed sensor "A" circuit

(Transmission revolution sensor (NT))

Not circuit malfunction

(MIL illuminated by following codes: P0717, P07BF, P07C0)

Output speed sensor circuit

(Transmission revolution sensor (NOUT))

Not circuit malfunction

(MIL illuminated by following codes: P0722, P077C, P077D)

Soak timer circuit

Not circuit malfunction

(MIL illuminated by following code: P2610)

Low voltage flag

OFF

Condition (A)

Time after engine start except for continuing shift position "N" or "P"*2	10 min. or more
Accumulated driving time*1	2 min. and 55 sec. or more
Driving distance after engine start*3	5 km (3.1 miles) or more
IAT*4	15°C (59°F) or higher
ECT (12 sec. after engine start)	15°C (59°F) or higher
Soak time	5 hours or more

Condition (B)

Time after engine start except for continuing shift position "N" or "P"*2	18 min. and 20 sec. or more
Accumulated driving time*1	4 min. and 10 sec. or more
Driving distance after engine start*3	7 km (4.3 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)

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 (9.9 miles)
IAT*4	-15°C (5°F) or more
ECT (12 sec. after engine start)	-15°C (5°F) or more

Condition (D)

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 (16.8 miles)

Condition (E)

Some of the following conditions are met: (a) or (b)	-
(a) Duration time from ECT	10 sec. or more
(b) Soak time	5 hours or more
ECT (12 sec. after engine start)	Below 35°C (95°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
Accumulated driving time is cleared when following condition met	-
Duration time from shift position "N" or "P"	-

*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

One of the following conditions is met: Condition (A), (B), (C), (D) or (E)

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

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
CVT fluid temperature	Below 20°C (68°F)

Condition (E)

CVT fluid temperature

100°C (212°F) or higher

COMPONENT OPERATING RANGE

CVT fluid temperature

20°C (68°F) or higher and below 100°C (212°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

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Transmission / Data List / A/T Oil Temperature No.1.
Warm up the engine and check that the Data List value (A/T Oil Temperature No.1) is between 20 and 100°C (68 and 212°F). [*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: P071000.

Check the DTC judgment result.

GTS 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.

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs.
Click here
Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.
Click here
Check that no DTCs are stored after performing initialization.
Click here

PROCEDURE

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

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

HINT:

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

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

GO TO DTC CHART

2.	CHECK CVT FLUID LEVEL

Click here

OK:

CVT fluid level is correct.

REPLACE TRANSMISSION CONTROL ECU (CVT FLUID TEMPERATURE SENSOR)

ADD FLUID

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