Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002B359
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [03/2023 -           ]
Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P071000; Transmission Fluid Temperature Sensor "A" Circuit Range/Performance; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]

DTC

P071000

Transmission Fluid Temperature Sensor "A" Circuit Range/Performance

DESCRIPTION

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

The sensor resistance changes with the CVT fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies voltage to the temperature sensor through ECM 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

DTC Output from

Priority

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, the CVT fluid temperature is less than 20°C (68°F), and the engine coolant temperatures are more than 82°C (180°F) for 3 seconds when the vehicle is driven for over 18 minutes and 7 km (4 miles).
  • When the intake air and engine coolant temperatures were more than -10°C (14°F) at engine start, the CVT fluid temperature is less than 5°C (41°F) for 3 seconds, and the vehicle is driven with the accelerator pedal depressed for over 11 minutes and 7 km (4 miles) with lock-up OFF.
  • 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

Engine

B

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 ECM 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), or less than 5°C (41°F) depending on the conditions, the ECM 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 ECM 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)

Time after engine start except for continuing shift position "N" or "P"*2

18 min. and 20 sec. or more

Accumulated driving time*5

3 min. and 20 sec. or more

Driving distance after engine start*3

7 km (4.3 miles)

IAT*4

-10°C (14°F) or more

ECT

-10°C (14°F) or more and less than 82°C (180°F)

Condition (F)

Any of the following conditions is met:

-

- Elapsed time for ECT to reach 60°C (140°F)

10 sec. or more

- 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"

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

*5: Following conditions are met

Engine speed - Turbine speed

300 rpm or more

Output speed

0 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"

300 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

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

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

Duration time from engine start

12 sec. or more

ECT

82°C (180°F) or higher

CVT fluid temperature

Below 20°C (68°F)

Condition (E)

Duration time from engine start

12 sec. or more

CVT fluid temperature

Below 5°C (41°F)

Condition (F)

Duration time from engine start

12 sec. or more

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 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Start the engine and turn the GTS on.
  4. Enter the following menus: Powertrain / Engine / Data List / A/T Oil Temperature No.1.
  5. 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.

  6. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  7. Input the DTC: P071000.
  8. 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 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  • Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION

  • Check that no DTCs are stored after performing initialization.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

HINT:

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

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P071000)

(a) Read the DTCs using the GTS.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Only P071000 is output

A

P071000 and other DTCs are output

B

B

GO TO DTC CHART

A

2.

CHECK CVT FLUID LEVEL

(a) Check the CVT fluid level.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE FLUID: ADJUSTMENT

OK:

CVT fluid level is correct.

OK

REPLACE TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)

NG

ADD FLUID