Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000002B35B
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [03/2023 -           ]
Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P071015; Transmission Fluid Temperature Sensor "A" Circuit Short to Battery or Open; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]

DTC

P071015

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

DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature into a resistance value for use 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

P071015

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

The CVT fluid 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).
  • Wire harness or connector
  • Transmission wire (CVT fluid temperature sensor)
  • ECM

Comes on

Engine

A

SAE Code:

P0713

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 can detect an open in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is more than 156 kΩ*, the ECM interprets this as a malfunction of the CVT fluid temperature sensor or wiring, illuminates the MIL and stores a DTC.

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

HINT:

The CVT fluid temperature can be checked in the Data List.

MONITOR STRATEGY

Related DTCs

P0713: CVT fluid temperature sensor/Range check (High voltage)

Required sensors/Components

CVT fluid temperature sensor (TFT sensor)

Frequency of operation

Continuous

Duration

0.5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Battery voltage

8 V or more

Ignition switch

ON

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 sec. 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 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

TFT sensor voltage

(CVT fluid temperature)

More than 4.915 V

(Less than -40°C (-40°F))

COMPONENT OPERATING RANGE

CVT fluid 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 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. 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.

  4. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  5. Input the DTC: P071015.
  6. 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.

WIRING DIAGRAM

Refer to DTC P071011.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P071011; Transmission Fluid Temperature Sensor "A" Circuit Short To Ground+

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

PROCEDURE

1.

READ VALUE USING GTS (A/T OIL TEMPERATURE NO.1)

Pre-procedure1

(a) Warm up the engine.

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Temperature No.1

CVT fluid temperature sensor value

Min.: -40°C (-40°F)

Max.: 150°C (302°F)

or Invalid Value
  • Approximately 100°C (212°F): After stall speed test
  • Equal to ambient temperature: After cold soak

If the value is -40°C (-40°F) or 150°C (302°F) or more, the CVT fluid temperature sensor circuit is open or shorted.

Powertrain > Engine > Data List

Tester Display

A/T Oil Temperature No.1

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

Post-procedure1

(c) None

B

GO TO STEP 3

A

2.

REPLACE ECM

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL

NEXT

PERFORM REGISTRATION AND INITIALIZATION

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

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

3.

INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)

Pre-procedure1

(a) Disconnect the C61 transmission wire connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

11 (OT+) - 12 (OT-)

Always

0.079 to 156 kΩ

11 (OT+) - Other terminals

Always

10 kΩ or higher

12 (OT-) - Other terminals

Always

10 kΩ or higher

HINT:

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

CVT Fluid Temperature

Specified Condition

10°C (50°F)

5.6 to 7.3 kΩ

25°C (77°F)

3.5 kΩ

110°C (230°F)

0.22 to 0.27 kΩ

Result:

Proceed to

OK

NG

*a

Component without harness connected

(Transmission Wire)

Post-procedure1

(c) Connect the C61 transmission wire connector.

NG

REPLACE TRANSMISSION WIRE

OK

4.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

Pre-procedure1

(a) Disconnect the C160 ECM connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C160-126 (THO1) - C160-125 (ETHO)

Always

0.079 to 156 kΩ

C160-126 (THO1) - Other terminals

Always

10 kΩ or higher

C160-125 (ETHO) - Other terminals

Always

10 kΩ or higher

Post-procedure1

(c) Connect the C160 ECM connector.

NG

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

5.

REPLACE ECM

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL

NEXT

PERFORM REGISTRATION AND INITIALIZATION

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

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