Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HSSN
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [03/2019 - 09/2022]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P084000,P28287F; Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance; 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]

DTC

P084000

Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance

DTC

P28287F

Pressure Control Solenoid "K" Actuator Stuck Off

DESCRIPTION

The TCM controls the secondary oil pressure based on the secondary oil pressure signal output by the oil pressure sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P084000

Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance

Either of the following conditions is met (1-trip detection logic):

  • When the requested oil pressure is less than 1.0 MPa (10.2 kgf/cm2, 145 psi), the oil pressure sensor output is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more for 3 seconds or more.
  • When the requested oil pressure is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more, the oil pressure sensor output is less than 0.5 MPa (5.1 kgf/cm2, 73 psi) for 2 seconds or more.
  • Oil pressure sensor
  • Transmission valve body assembly
  • TCM
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P0841

P28287F

Pressure Control Solenoid "K" Actuator Stuck Off

Either of the following conditions is met (1-trip detection logic):

  • When the requested oil pressure is less than 1.0 MPa (10.2 kgf/cm2, 145 psi), the oil pressure sensor output is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more for 3 seconds or more.
  • When the requested oil pressure is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more, the oil pressure sensor output is less than 0.5 MPa (5.1 kgf/cm2, 73 psi) for 2 seconds or more.
  • Oil pressure sensor
  • Transmission valve body assembly
  • TCM
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P2829

DTC Detection Condition Patterns (P084000 and P28287F):

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The requested oil pressure value is less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

-

The requested oil pressure value is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more

-

Malfunction Condition

The oil pressure sensor output value is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more

-

The oil pressure sensor output value is less than 0.5 MPa (5.1 kgf/cm2, 73 psi)

-

Duration

3 seconds or more

2 seconds or more

Detection Logic

1-trip detection logic

1-trip detection logic

HINT:

These DTCs are output when either of the above detection patterns is met.

MONITOR DESCRIPTION

The TCM checks for belt clamping high-pressure or low-pressure malfunctions. If a mechanical malfunction of the shift solenoid valve SLS or a malfunction of the oil pressure sensor is detected by the TCM, it illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0841: Transmission fluid pressure sensor "A" (PTO (Oil pressure sensor))/Rationality fault diagnostics

P2829: Pressure control solenoid "K" (Shift solenoid valve SLS)/Functional check

Required sensors/Components

Crankshaft position sensor

Transmission revolution sensor (NT)

Transmission revolution sensor (NC1)

Transmission revolution sensor (NSS)

Transmission revolution sensor (NOUT)

CVT fluid temperature sensor

Engine coolant temperature sensor

Oil pressure sensor

Shift solenoid valve SL1

Shift solenoid valve SL2

Shift solenoid valve SLP

Shift solenoid valve SLS

Shift solenoid valve SLU

Frequency of operation

Continuous

Duration

P0841:

  • OFF malfunction (A): 2 sec.

    OFF malfunction (B): 1 sec.

    OFF malfunction (C): 4 sec.

    OFF malfunction (D): 2 sec.

    ON malfunction (A): 3 sec.

    ON malfunction (B): 3 sec.

P2829:

  • OFF malfunction (A): 3 sec.

    OFF malfunction (B): 3 sec.

    ON malfunction: 2 sec.

MIL operation

1 driving cycle

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)

Crankshaft position sensor "A" circuit

(Crankshaft position sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0335, P0337, P0338)

CAN communication between ECM and TCM

Not system down

(MIL illuminated by following codes: U0100, U0101)

Low voltage flag

OFF

Transmission fluid pressure sensor "A" circuit

(Oil pressure sensor)

Not circuit malfunction

(MIL illuminated by following codes: P0842, P0843)

Pressure control solenoid "J" circuit

(Shift solenoid valve SLP)

Not circuit malfunction

(MIL illuminated by following codes: P2826, P2827)

Pressure control solenoid "K" circuit

(Shift solenoid valve SLS)

Not circuit malfunction

(MIL illuminated by following codes: P282F, P2830)

Torque converter clutch pressure control solenoid circuit

(Shift solenoid valve SLU)

Not circuit malfunction

(MIL illuminated by following codes: P2763, P2764)

Pressure control solenoid "A" circuit

(Shift solenoid valve SL1)

Not circuit malfunction

(MIL illuminated by following codes: P0962, P0963)

Pressure control solenoid "B" circuit

(Shift solenoid valve SL2)

Not circuit malfunction

(MIL illuminated by following codes: P0966, P0967)

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)

Intermediate shaft speed sensor "C" circuit

(Transmission revolution sensor (NSS))

Not circuit malfunction

(MIL illuminated by following codes: P07C9, P07CA, P2751)

Output speed sensor circuit

(Transmission revolution sensor (NOUT))

Not circuit malfunction

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

Intermediate shaft speed sensor "B" circuit

(Transmission revolution sensor (NC1))

Not circuit malfunction

(MIL illuminated by following codes: P07C7, P07C8, P2747)

P0841:

  • OFF malfunction (A)

    Engine speed

    550 rpm or more

    Transmission fluid temperature

    -10°C (14°F) or more

    Time after following condition is met

    0.5 sec. or more

    - Variation of the accelerator pedal angle

    (within 32.768 msec.)

    Less than 0.5%

    Shift solenoid valve SLS

    Operating clamping pressure control by TCM command

    ECT

    60°C (140°F) or more

    Spark advance from MAX. retard timing by KCS control

    0 °CA or more

    Gear and belt mode clutch

    Either engagement or disengagement

    OFF malfunction (B)

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Engine speed

    500 rpm or more

    Synchronizer

    Engaged

    Turbine speed

    More than 0 rpm

    Any of the following conditions are met: (a) or (b)

    -

    (a) Gear mode clutch speed

    More than 0 rpm

    (b) All of the following conditions are met

    -

    - Gear mode clutch speed

    0 rpm

    - Output speed

    0 rpm

    OFF malfunction (C)

    Shift position

    "N" or "P" or "D" or "B"

    Gear shift position circuit

    Not circuit malfunction

    (P0916, P0917)

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Engine speed

    500 rpm or more

    OFF malfunction (D)

    Any of the following conditions are met: (a) or (b)

    -

    (a) Gear mode clutch

    Engaged

    (b) Belt mode clutch

    Engaged

    Engine speed

    1000 rpm or more

    Shift solenoid valve SLP

    Operating shift control by TCM command

    ON malfunction (A)

    Engine speed

    550 rpm or more

    Transmission fluid temperature

    -10°C (14°F) or more

    Time after following condition is met

    0.5 sec. or more

    - Variation of the accelerator pedal angle

    (within 32.768 msec.)

    Less than 0.5%

    Shift solenoid valve SLS

    Operating clamping pressure control by TCM command

    ECT

    60°C (140°F) or more

    Spark advance from MAX. retard timing by KCS control

    0 °CA or more

    All of the following conditions are met

    -

    - Gear mode clutch

    Engaged

    - Belt mode clutch

    Engaged

    ON malfunction (B)

    Tire

    Not slipping

    Primary sheave speed

    100 rpm or more

    Secondary sheave speed

    150 rpm or more

    Output speed

    1000 rpm or more

    Transmission fluid temperature

    -10°C (14°F) or more and less than 140°C (284°F)

    Belt mode clutch

    Engaged

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Actual gear ratio

    More than 0.5 and 2.2 or less

    Accelerator pedal

    ON

    Target clamping pressure

    Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

    Target gear ratio

    More than 0.9 and 1.1 or less

P2829:

  • All

    Engine speed

    550 rpm or more

    Transmission fluid temperature

    -10°C (14°F) or more

    Time after following condition is met

    0.5 sec. or more

    - Variation of the accelerator pedal angle

    (within 32.768 msec.)

    Less than 0.5%

    Shift solenoid valve SLS

    Operating clamping pressure control by TCM command

    ECT

    60°C (140°F) or more

    Spark advance from MAX. retard timing by KCS control

    0 °CA or more

    OFF malfunction (A)

    Any of the following conditions are met: (a) or (b)

    -

    (a) Gear mode clutch

    Engaged

    (b) Belt mode clutch

    Engaged

    OFF malfunction (B)

    Tire

    Not slipping

    Primary sheave speed

    100 rpm or more

    Secondary sheave speed

    150 rpm or more

    Output speed

    1000 rpm or more

    Transmission fluid temperature

    -10°C (14°F) or more and less than 140°C (284°F)

    Belt mode clutch

    Engaged

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Actual gear ratio

    More than 0.5 and 2.2 or less

    Accelerator pedal

    ON

    Target clamping pressure

    Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

    Target gear ratio

    More than 0.9 and 1.1 or less

    ON malfunction

    Gear and belt mode clutch

    Either engagement or disengagement

TYPICAL MALFUNCTION THRESHOLDS

P0841:

  • OFF malfunction
    • OFF malfunction (A) is met and none of the following conditions are met: OFF malfunction (B), (C) and (D)

      OFF malfunction (A)

      Target clamping pressure

      1.4 MPa (14.3 kgf/cm2, 203 psi) or more

      Actual clamping pressure

      Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)

      OFF malfunction (B)

      TCM indicate gear mode clutch

      Engagement

      Turbine speed - Gear mode clutch speed

      More than 200 rpm

      OFF malfunction (C)

      TCM indicate synchronizer

      Engagement

      Synchronizer

      Not engaged

      OFF malfunction (D)

      TCM indicate lock-up clutch

      Engagement

      Engine speed - Turbine speed

      250 rpm or more

  • ON malfunction
    • All of the following conditions are met

      ON malfunction (A)

      Target clamping pressure

      Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

      Actual clamping pressure

      2.5 MPa (25.5 kgf/cm2, 363 psi) or more

      ON malfunction (B) (after ON malfunction (A) is met)

      *: Calculated primary pulley pressure is calculated by value of transmission fluid pressure sensor "A" (oil pressure sensor) and actual gear ratio.

      Calculated primary pulley pressure* - Target primary pulley pressure

      2.0 MPa (20.4 kgf/cm2, 290 psi) or more

P2829:

  • OFF malfunction
    • All of the following conditions are met

      OFF malfunction (A)

      Target clamping pressure

      Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

      Actual clamping pressure

      2.5 MPa (25.5 kgf/cm2, 363 psi) or more

      OFF malfunction (B) (after OFF malfunction (A) is met)

      *: Calculated primary pulley pressure is calculated by value of transmission fluid pressure sensor "A" (oil pressure sensor) and actual gear ratio.

      Calculated primary pulley pressure* - Target primary pulley pressure

      Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)

  • ON malfunction

    Target clamping pressure

    1.4 MPa (14.3 kgf/cm2, 203 psi) or more

    Actual clamping pressure

    Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)

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: P084000 or P28287F.
  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

Refer to DTC P084011.

Click here 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P084011; Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground

CAUTION / NOTICE / HINT

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform a stall test if any wheel chock is out of position.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
  • The vehicle could begin moving suddenly, resulting 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

HINT:

If any DTCs other than P084000 or P28287F are output, perform troubleshooting for those DTCs first.

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P084000 AND P28287F)

(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 / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

HINT:

  • If DTC P084011 or P084015 is output, perform troubleshooting for that DTC first.
  • If DTCs P084011 and P084015 are not output but DTC P282812 or P282814 is output, perform troubleshooting for DTC P282812 or P282814 first.

Result

Proceed to

Only DTC P084000 is output

A

Only DTC P28287F is output

B

Both DTC P084000 and P28287F are output

C

DTC P084000 and/or P28287F and P084011 are output

D

DTC P084000 and/or P28287F and P084015 are output

E

DTC P084000 and/or P28287F and P282812 output

F

DTC P084000 and/or P28287F and P282814 output

G

DTC P084000 and/or P28287F and DTCs other than P084011, P084015, P282812 and P282814 are output

H

B

GO TO STEP 6

C

GO TO STEP 8

D

GO TO DTC CHART (DTC P084011)

E

GO TO DTC CHART (DTC P084015)

F

GO TO DTC CHART (DTC P282812)

G

GO TO DTC CHART (DTC P282814)

H

GO TO DTC CHART 2020 - 2021 MY Corolla Corolla Hatchback [03/2019 - 06/2021]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2022 MY Corolla Corolla Hatchback [06/2021 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

A

2.

READ VALUE USING TECHSTREAM (BELT CLAMPING FORCE SENSOR)

CAUTION:

A stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
  • Perform this test with the air conditioning off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
  • w/ Electric Parking Brake System:

    Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

w/ Electric Parking Brake System:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(c) Connect the Techstream to the DLC3.

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

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Active Test / Activate the TC Terminal.

(g) According to the display on the Techstream, perform the Active Test.

Powertrain > Transmission > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Activate the TC Terminal

Turn on and off TC and TE1 (CG) connection

ON or OFF

  • ON: TC and TE1 are connected.
  • OFF: TC and TE1 are disconnected.

(Vehicle Condition)

  • Engine switch on (IG), engine stopped and shift lever in P

(h) Enter the following menus: Powertrain / Transmission / Data List / Belt Clamping Force Sensor.

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

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Belt Clamping Force Sensor

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.5 to 4.3 MPa (35.7 to 43.8 kgf/cm2, 508 to 624 psi): D position stall test
  • 1.6 to 2.4 MPa (16.3 to 24.5 kgf/cm2, 232 to 348 psi): R position stall test

-

Powertrain > Transmission > Active Test

Active Test Display

Activate the TC Terminal

Data List Display

Belt Clamping Force Sensor

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

3.

CHECK TCM (VCPT TERMINAL VOLTAGE)

(a) Disconnect the C71 oil pressure sensor connector.

*a

Front view of wire harness connector

(to Oil Pressure Sensor)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C71-3 (VC) - C71-1 (E2)

Engine switch on (IG)

4.75 to 5.25 V

(c) Connect the C71 oil pressure sensor connector.

NG

GO TO STEP 5

OK

4.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): OIL PRESSURE SENSOR: COMPONENTS

NEXT

PERFORM INITIALIZATION

5.

REPLACE TCM

(a) Replace the TCM.

Click here 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

6.

READ VALUE USING TECHSTREAM (BELT CLAMPING FORCE SENSOR)

CAUTION:

A stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
  • Perform this test with the air conditioning off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
  • w/ Electric Parking Brake System:

    Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

w/ Electric Parking Brake System:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(c) Connect the Techstream to the DLC3.

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

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Active Test / Activate the TC Terminal.

(g) According to the display on the Techstream, perform the Active Test.

Powertrain > Transmission > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Activate the TC Terminal

Turn on and off TC and TE1 (CG) connection

ON or OFF

  • ON: TC and TE1 are connected.
  • OFF: TC and TE1 are disconnected.

(Vehicle Condition)

  • Engine switch on (IG), engine stopped and shift lever in P

(h) Enter the following menus: Powertrain / Transmission / Data List / Belt Clamping Force Sensor.

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

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Belt Clamping Force Sensor

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.5 to 4.3 MPa (35.7 to 43.8 kgf/cm2, 508 to 624 psi): D position stall test
  • 1.6 to 2.4 MPa (16.3 to 24.5 kgf/cm2, 232 to 348 psi): R position stall test

-

Powertrain > Transmission > Active Test

Active Test Display

Activate the TC Terminal

Data List Display

Belt Clamping Force Sensor

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

7.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 04/2020]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: COMPONENTS 2021 MY Corolla Corolla Hatchback [04/2020 - 06/2021]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: COMPONENTS 2022 MY Corolla Corolla Hatchback [06/2021 - 09/2022]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: 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

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8.

READ VALUE USING TECHSTREAM (BELT CLAMPING FORCE SENSOR)

CAUTION:

A stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
  • Perform this test with the air conditioning off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
  • w/ Electric Parking Brake System:

    Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

w/ Electric Parking Brake System:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(c) Connect the Techstream to the DLC3.

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

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Active Test / Activate the TC Terminal.

(g) According to the display on the Techstream, perform the Active Test.

Powertrain > Transmission > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Activate the TC Terminal

Turn on and off TC and TE1 (CG) connection

ON or OFF

  • ON: TC and TE1 are connected.
  • OFF: TC and TE1 are disconnected.

(Vehicle Condition)

  • Engine switch on (IG), engine stopped and shift lever in P

(h) Enter the following menus: Powertrain / Transmission / Data List / Belt Clamping Force Sensor.

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

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Belt Clamping Force Sensor

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.5 to 4.3 MPa (35.7 to 43.8 kgf/cm2, 508 to 624 psi): D position stall test
  • 1.6 to 2.4 MPa (16.3 to 24.5 kgf/cm2, 232 to 348 psi): R position stall test

-

Powertrain > Transmission > Active Test

Active Test Display

Activate the TC Terminal

Data List Display

Belt Clamping Force Sensor

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

9.

CHECK TCM (VCPT TERMINAL VOLTAGE)

(a) Disconnect the C71 oil pressure sensor connector.

*a

Front view of wire harness connector

(to Oil Pressure Sensor)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C71-3 (VC) - C71-1 (E2)

Engine switch on (IG)

4.75 to 5.25 V

(c) Connect the C71 oil pressure sensor connector.

NG

GO TO STEP 13

OK

10.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SLS)

(a) Disconnect the transmission wire connector from the shift solenoid valve SLS.

Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 VALVE BODY ASSEMBLY: REMOVAL

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SLS

*a

Component without harness connected

(Shift Solenoid Valve SLS)

-

-

(b) Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the shift solenoid valve SLS connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

NG

GO TO STEP 12

OK

11.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

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NEXT

PERFORM INITIALIZATION

12.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

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NEXT

PERFORM REGISTRATION AND INITIALIZATION

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13.

REPLACE TCM

(a) Replace the TCM.

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NEXT

PERFORM REGISTRATION AND INITIALIZATION

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