Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HHPX
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [01/2019 - 09/2022]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P071512,P071514,P071531; Input/Turbine Speed Sensor "A" Circuit Short to Battery; 2020 - 2022 MY Corolla Corolla Hatchback [01/2019 - 09/2022]

DTC

P071512

Input/Turbine Speed Sensor "A" Circuit Short to Battery

DTC

P071514

Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open

DTC

P071531

Input/Turbine Speed Sensor "A" No Signal

DESCRIPTION

The TCM uses signals from the transmission revolution sensor (NT) installed to the continuously variable transaxle to control the lock-up engagement pressure.

The transmission revolution sensor (NT) detects the input turbine speed and sends it to the TCM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071512

Input/Turbine Speed Sensor "A" Circuit Short to Battery

The transmission revolution sensor (NT) signal is normal but the transmission revolution sensor (NT) output voltage is higher than 1.8 V for 2 seconds or more (1-trip detection logic).

  • Wire harness or connector
  • Transmission revolution sensor (NT)
  • TCM

Comes on

DTC stored

SAE Code:

P07C0

P071514

Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open

The transmission revolution sensor (NT) signal is normal but the transmission revolution sensor (NT) output voltage is less than 0.2 V for 2 seconds or more (1-trip detection logic).

  • Wire harness or connector
  • Transmission revolution sensor (NT)
  • TCM

Comes on

DTC stored

SAE Code:

P07BF

P071531

Input/Turbine Speed Sensor "A" No Signal

When transmission revolution sensor (NSS) and (NOUT) signals both indicate 780 rpm or more, the transmission revolution sensor (NT) signal indicates less than 300 rpm for 5 seconds or more (1-trip detection logic).

  • Wire harness or connector
  • Transmission revolution sensor (NT)
  • TCM

Comes on

DTC stored

SAE Code:

P0717

MONITOR DESCRIPTION

The transmission revolution sensor (NT) is used to detect the input turbine speed. The TCM determines the necessary gear ratio based on a comparison of the transmission revolution sensor (NT) (input turbine speed) and transmission revolution sensor (NOUT) (output shaft speed) signals.

When the output shaft speed is higher than the expected value and the input turbine speed is less than 300 rpm while driving with the shift lever in D, the TCM will determine that the transmission revolution sensor (NT) is malfunctioning, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0717: Turbine speed sensor (Transmission revolution sensor (NT))/Verify pulse input

P07BF: Turbine speed sensor (Transmission revolution sensor (NT))/Range check (Low voltage)

P07C0: Turbine speed sensor (Transmission revolution sensor (NT))/Range check (High voltage)

Required sensors/Components

Transmission revolution sensor (NT)

Transmission revolution sensor (NSS)

Transmission revolution sensor (NOUT)

Frequency of operation

Continuous

Duration

P0717: 5 sec.

P07BF, P07C0: 2 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Battery voltage

8 V or more

Engine switch

On (IG)

Starter

OFF

P0717

Turbine speed sensor range check fail (P07BF, P07C0)

(Pending / MIL)

Not detected

D range position switch

ON

R range position switch

OFF

Park position switch

OFF

Neutral position switch

OFF

Engine

Running

Pressure control solenoid circuit fail (P08CA, P08CB, P0962, P0963, P0966, P0967, P2826, P2827, P282F, P2830)

(Pending + MIL)

Not detected

Torque converter clutch pressure control solenoid circuit fail (P2763, P2764)

(Pending + MIL)

Not detected

Intermediate shaft speed sensor for belt drive revolution

780 rpm or more

Output speed sensor revolution

780 rpm or more

Vehicle speed sensor monitor condition judgment:

D range position switch

ON

R range position switch

OFF

Park position switch

OFF

Neutral position switch

OFF

Pressure control solenoid circuit fail (P08CA, P08CB, P0962, P0963, P0966, P0967, P2826, P2827, P282F, P2830)

(Pending + MIL)

Not detected

Torque converter clutch pressure control solenoid circuit fail (P2763, P2764)

(Pending + MIL)

Not detected

Output speed sensor revolution

380 rpm or more

Intermediate shaft speed sensor for belt drive revolution

380 rpm or more

One of the following conditions is met

-

- Speed sensor monitor driving mode

Belt mode (Synchronizer engaged)

- Speed sensor monitor driving mode

Belt mode (Synchronizer released)

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

  • Condition (A)

    ECT

    20°C (68°F) or more

    ECT sensor circuit fail (P0117, P0118)

    (Pending + MIL)

    Not detected

    All of the following conditions are met

    2 sec. or more

    - Park position switch

    OFF

    - Neutral position switch

    OFF

    Condition (B)

    One of the following conditions is met

    -

    - ECT

    Less than 20°C (68°F)

    - ECT sensor circuit fail (P0117, P0118)

    (Pending + MIL)

    Detected

    All of the following conditions are met

    30 sec. or more

    - Park position switch

    OFF

    - Neutral position switch

    OFF

P07BF, P07C0

Turbine speed sensor pulse input fail (P0717)

(Pending / MIL)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0717

Turbine speed sensor revolution

Less than 300 rpm

P07BF

Turbine speed sensor voltage

Less than 0.2 V

P07C0

Turbine speed sensor voltage

More than 1.8 V

COMPONENT OPERATING RANGE

P0717

Turbine speed sensor revolution

300 rpm or more

P07BF, P07C0

Turbine speed sensor voltage

0.2 V or more and 1.8 V or less

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 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Start the engine.
  7. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here 2020 - 2022 MY Corolla Corolla Hatchback [01/2019 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Stop the vehicle.
  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  10. Input the DTC: P071512, P071514 or P071531.
  11. 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

CAUTION:

  • Strictly observe posted speed, limits, traffic laws and road conditions.
  • Do not drive the vehicle with the cable of the Techstream contacting the pedals, shift lever or steering wheel.
  • Driving the vehicle with the cable of the Techstream contacting these areas could impede vehicle control, resulting in a serious accident.
  • Do not operate the Techstream while driving the vehicle.
  • Operating the Techstream while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 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 2020 - 2022 MY Corolla Corolla Hatchback [01/2019 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION

  • Check that no DTCs are stored after performing initialization.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

PROCEDURE

1.

READ VALUE USING TECHSTREAM (NT SENSOR SPEED AND NT SENSOR VOLTAGE)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Data List.

(e) According to the display on the Techstream, read the Data List.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

NT Sensor Speed

Input turbine speed (NT)

Min.: 0 rpm

Max.: 65535 rpm

  • Equal to engine speed (NE): Lock-up ON (After warming up engine)
  • Nearly equal to engine speed (NE): Lock-up OFF (Engine idling with shift lever in P or N)
  • 0 rpm: Vehicle stopped with shift lever in R

-

NT Sensor Voltage

Transmission revolution sensor (NT) output voltage

Min.: 0.000 V

Max.: 4.999 V

0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in P or N)

-

Powertrain > Transmission > Data List

Tester Display

NT Sensor Speed

NT Sensor Voltage

Result

Proceed to

Data List values are normal

A

Data List values are not normal

B

B

GO TO STEP 3

A

2.

REPLACE TCM

(a) Replace the TCM.

Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): K120 TCM: COMPONENTS 2020 - 2025 MY Corolla Corolla Hatchback [03/2019 -        ]; K120 / K121 (CVT): K120 TCM: COMPONENTS

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: REGISTRATION

for Initialization: Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION

3.

INSPECT TRANSMISSION REVOLUTION SENSOR (NT)

(a) Remove the transmission revolution sensor (NT).

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): REVOLUTION SENSOR (NT SENSOR): REMOVAL

(b) Connect the battery to the transmission revolution sensor (NT) as shown in the illustration.

*1

Battery

*2

Ammeter

*a

Component without harness connected

(Transmission Revolution Sensor (NT))

*b

Magnet

*c

5 mm or less

-

-

(c) Wave a magnet left and right 5 mm (0.197 in.) or less from the tip of the transmission revolution sensor (NT) to output a high/low signal while measuring the current.

NOTICE:

Make sure to wave the magnet during the inspection. The current will not change unless the magnet is moved as shown in the illustration.

(d) Measure the current according to the value(s) in the table below.

Standard Current:

Tester Connection

Condition

Specified Condition

1 (NTO) - 2 (NTB)

Low signal

4 to 8 mA

1 (NTO) - 2 (NTB)

High signal

12 to 16 mA

NG

REPLACE TRANSMISSION REVOLUTION SENSOR (NT) 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): REVOLUTION SENSOR (NT SENSOR): COMPONENTS 2020 - 2025 MY Corolla Corolla Hatchback [03/2019 -        ]; K120 / K121 (CVT): REVOLUTION SENSOR (NT SENSOR): COMPONENTS

OK

4.

CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NT) - TCM)

(a) Disconnect the C67 transmission revolution sensor (NT) connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C67-2 (NTB) - C80-25 (NTB)

Always

Below 1 Ω

C67-1 (NTO) - C80-9 (NTO)

Always

Below 1 Ω

C67-2 (NTB) or C80-25 (NTB) - Body ground and other terminals

Always

10 kΩ or higher

C67-1 (NTO) or C80-9 (NTO) - Body ground and other terminals

Always

10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C67 transmission revolution sensor (NT) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NOUT) - TCM)

OK

5.

REPLACE TCM

(a) Replace the TCM.

Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): K120 TCM: COMPONENTS 2020 - 2025 MY Corolla Corolla Hatchback [03/2019 -        ]; K120 / K121 (CVT): K120 TCM: COMPONENTS

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: REGISTRATION

for Initialization: Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION