Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GYSM
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [01/2019 - 11/2022]
Title: K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P0741,P075B,P2757; Torque Converter Clutch Circuit Performance or Stuck OFF; 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]

DTC

P0741

Torque Converter Clutch Circuit Performance or Stuck OFF

DTC

P075B

Shift Solenoid "G" Performance or Stuck Off

DTC

P2757

Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance or Stuck OFF

DESCRIPTION

The ECM uses the shift solenoid valves SC and SL to switch control of the shift solenoid valve SLU between forward and reverse clutch control and lock-up control in response to driving conditions.

HINT:

If DTC P0741 is stored after the engine has stalled, the lock-up shift solenoid valve (shift solenoid valve SL) may be malfunctioning.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0741

Torque Converter Clutch Circuit Performance or Stuck OFF

Any of the following conditions are met (2-trip detection logic):

  • When the ECM sends a lock-up OFF command and turns the shift solenoid valves SC and SL OFF, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • When the ECM turns the shift solenoid valves SC and SL ON, the difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more for 1 second or more.
  • While the vehicle is driven, a lock-up ON command is sent, but lock-up control is not performed for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

P075B

Shift Solenoid "G" Performance or Stuck Off

Any of the following conditions are met (2-trip detection logic):

  • When the ECM sends a lock-up ON command and turns the shift solenoid valves SC and SL ON, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • When the ECM turns the shift solenoid valves SC and SL OFF, the difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more for 1 second or more.
  • While the vehicle is driven, a lock-up ON command is sent, but lock-up control is not performed for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

P2757

Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance or Stuck OFF

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

  • When the ECM sends a lock-up ON command and turns the shift solenoid valves SC and SLU OFF and SL ON, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • While the vehicle is driven, a lock-up signal is turned ON, but the lock-up remains OFF for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

DTC Detection Condition Patterns (P0741):

 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnostic Condition

The ECM sends a lock-up OFF command and turns the shift solenoid valves SC and SL OFF.

-

-

The ECM turns the shift solenoid valves SC and SL ON.

-

-

The vehicle is driven and a lock-up ON command is sent.

-

-

Malfunction Condition

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

-

The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

-

-

Lock-up control is not performed.

-

-

Duration

1 second or more

1 second or more

1 second or more

Detection Logic

2-trip detection logic

2-trip detection logic

2-trip detection logic

DTC Detection Condition Patterns (P075B):

 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnostic Condition

The ECM turns the shift solenoid valves SC and SL OFF.

-

-

The vehicle is being driven.

-

-

The ECM sends a lock-up ON command and turns the shift solenoid valves SC and SL ON.

-

-

Malfunction Condition

The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

-

-

The lock-up ON command is sent, but lock-up control is not performed.

-

-

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

-

Duration

1 second or more

1 second or more

1 second or more

Detection Logic

2-trip detection logic

2-trip detection logic

2-trip detection logic

DTC Detection Condition Patterns (P2757):

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The ECM sends a lock-up ON command, and turns the shift solenoid valves SC and SLU OFF and SL ON.

-

The vehicle is being driven.

-

Malfunction Condition

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

The lock-up signal is turned ON, but the lock-up remains OFF.

-

Duration

1 second or more

1 second or more

Detection Logic

2-trip detection logic

2-trip detection logic

HINT:

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

MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the transmission revolution sensor (NT) output speed and engine speed (NE) to detect mechanical malfunctions in the shift solenoid valves SL and SC.

If the torque converter does not lock-up while a lock-up ON command is being sent, the ECM detects it as a mechanical malfunction of the shift solenoid valve SLU.

If the difference between the engine speed (NE) and transmission revolution sensor (NT) output speed or transmission revolution sensor (NIN) output speed and transmission revolution sensor (NT) output speed is outside of the threshold, the ECM detects the malfunction, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0741: Torque converter clutch solenoid (Shift solenoid valve SL) / Functional check

P075B: Shift solenoid "G" (Shift solenoid valve SC) / Functional check

P2757: Torque converter clutch pressure control solenoid (Shift solenoid valve SLU) / Functional check

Required sensors/Components

Continuously variable transaxle assembly

(Shift solenoid valve SL, Shift solenoid valve SC, Shift solenoid valve SLU)

Frequency of operation

Continuous

Duration

1 second

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Electric throttle control system (ETCS)

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)

Knock sensor circuit

Not circuit malfunction

(MIL illuminated by following codes: P0327, P0328)

Engine coolant temperature (ECT) sensor circuit

Not circuit malfunction

(MIL illuminated by following codes: P0117, P0118)

Intake air temperature (IAT) sensor circuit

Not circuit malfunction

(MIL illuminated by following codes: P0112, P0113)

Shift solenoid "G" circuit

(Shift solenoid valve SC)

Not circuit malfunction

(MIL illuminated by following codes: P099B, P099C)

Torque converter clutch solenoid circuit

(Shift solenoid valve SL circuit)

Not circuit malfunction

(MIL illuminated by following codes: P2769, P2770)

Torque converter clutch pressure control solenoid circuit

(Shift solenoid valve SLU circuit)

Not circuit malfunction

(MIL illuminated by following codes: P2763, P2764)

Pressure control solenoid "K" circuit

(Shift solenoid valve SLS circuit)

Not circuit malfunction

(MIL illuminated by following codes: P282F, P2830)

Pressure control solenoid "J" circuit

(Shift solenoid valve SLP circuit)

Not circuit malfunction

(MIL illuminated by following codes: P2826, P2827)

Transmission fluid temperature sensor "A" circuit

(CVT fluid temperature sensor circuit)

Not circuit malfunction

(MIL illuminated by following codes: P0712, P0713)

Turbine speed sensor "A" circuit

Not circuit malfunction

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

Output speed sensor circuit

Not circuit malfunction

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

Crankshaft position sensor "A" circuit

Not circuit malfunction

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

Low voltage flag

OFF

P0741:

  • OFF malfunction (A)

    Input speed sensor "B" circuit

    Not circuit malfunction

    (MIL illuminated by following codes: P2767)

    All of the following conditions are met: (a) and (b)

    -

    (a) Turbine speed

    0 rpm or more

    (b) Some of the following conditions are met: (c) or (d)

    -

    (c) Input speed

    0 rpm or more

    (d) All of the following conditions are met: (e) and (f)

    -

    (e) Input speed

    0 rpm

    (f) Output speed

    0 rpm

    Turbine torque

    Less than 150 N*m (1530 kgf*cm, 111 ft.*lbf)

    Engine speed

    500 rpm or more

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "ON" and SL "ON"

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    OFF malfunction (B)

    Engine speed

    1000 rpm or more

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "OFF" and SL "ON"

    ECM commands

    SLU ON

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    ON malfunction (A)

    Forward or reverse clutch engaged flag

    ON

    Input speed sensor "B" circuit

    Not circuit malfunction

    (MIL illuminated by following codes: P2767)

    Engine speed

    500 rpm or more and less than 2000 rpm

    Time after following condition is met:

    2 seconds or more

    - Accelerator pedal release flag

    ON

    Transmission fluid temperature

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

    Turbine speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

    650 rpm or more at engine speed 800 rpm

    (Conditions vary with engine speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R")

    Input speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

    50 rpm or less

    Output speed

    100 rpm or less

    ON malfunction (B)

    Calculated input torque

    64 N*m (653 kgf*cm, 47 ft.*lbf) or more at turbine speed 2000 rpm (conditions vary with Turbine speed)

    Engine speed

    500 rpm or more

    Accelerator pedal release flag

    OFF

    Time after following condition is met:

    0.073 seconds or more at transmission fluid temperature 80°C (176°F)

    (Conditions vary with transmission fluid temperature)

    - ECM commands

    SC "OFF" and SL "OFF"

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    Target SLU pressure

    0.1 MPa (1.0 kgf/cm2, 15 psi) or more

    ON malfunction (C)

    Calculated input torque

    64 N*m (653 kgf*cm, 47 ft.*lbf) or more at turbine speed 2000 rpm (conditions vary with Turbine speed)

    Engine speed

    500 rpm or more

    Accelerator pedal release flag

    OFF

    Time after following condition is met:

    0.073 seconds or more at transmission fluid temperature 80°C (176°F)

    (Conditions vary with Transmission fluid temperature)

    - ECM commands

    SC "OFF" and SL "OFF"

    ECM commands

    SLU ON

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    Shift Solenoid "G" circuit

    (Shift solenoid valve SC)

    Not performance malfunction

    (MIL illuminated by following codes: P075B)

P075B:

  • OFF malfunction (A)

    Forward or reverse clutch engaged flag

    ON

    Input speed sensor "B" circuit

    Not circuit malfunction

    (MIL illuminated by following codes: P2767)

    Engine speed

    500 rpm or more and less than 2000 rpm

    Time after following condition is met:

    2 seconds or more

    - Accelerator pedal release flag

    ON

    Transmission fluid temperature

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

    Turbine speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

    650 rpm or more at engine speed 800 rpm

    (Conditions vary with engine speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R")

    Input speed when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

    50 rpm or less

    Output speed

    100 rpm or less

    OFF malfunction (B)

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    Calculated input torque

    64 N*m (653 kgf*cm, 47 ft.*lbf) or more at turbine speed 2000 rpm (conditions vary with Turbine speed)

    Engine speed

    500 rpm or more

    Accelerator pedal release flag

    OFF

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "ON" and SL "ON"

    ECM commands

    SLU ON

    ON malfunction (A)

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    Input speed sensor "B" circuit

    Not circuit malfunction

    (MIL illuminated by following codes: P2767)

    All of the following conditions are met: (a) and (b)

    -

    (a) Turbine speed

    More than 0 rpm

    (b) Some of the following conditions are met: (c) or (d)

    -

    (c) Input speed

    More than 0 rpm

    (d) All of the following conditions are met: (e) and (f)

    -

    (e) Input speed

    0 rpm

    (f) Output speed

    0 rpm

    Turbine torque

    Less than 150 N*m (1530 kgf*cm, 111 ft.*lbf)

    Engine speed

    500 rpm or more

    Time after following condition is met:

    0.073 seconds or more at transmission fluid temperature 80°C (176°F)

    (Conditions vary with transmission fluid temperature)

    - ECM commands

    SC "OFF" and SL "OFF"

    ON malfunction (B)

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    Engine speed

    1000 rpm or more

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "OFF" and SL "ON"

    ECM commands

    SLU ON

P2757:

  • OFF malfunction

    Engine speed

    1000 rpm or more

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "OFF" and SL "ON"

    ECM commands

    SLU ON

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    ON malfunction (A)

    ECM commands

    SC "OFF" and SL "ON"

    Engine speed - Turbine speed

    (when lock up commands*)

    300 rpm or more

    Time after following condition is met:

    0.5 seconds or more

    - Variation of the accelerator pedal angle

    -0.5% per 32 msec. or more

    Calculated input torque

    64 N*m (653 kgf*cm, 47 ft.*lbf) or more at turbine speed 2000 rpm (conditions vary with turbine speed)

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    ON malfunction (B)

    Time after following condition is met:

    4.177 seconds or more

    - Starter

    OFF

    Shift position

    "not N" and "not P"

    Time after following condition is met:

    4.177 seconds or more

    - Ignition switch

    ON

    Engine speed when ECM commands not (SC "OFF" and SL "ON") to ECM commands (SC "OFF" and SL "ON")

    850 rpm or more

    Duration time from ECM commands not (SC "OFF" and SL "ON") to ECM commands (SC "OFF" and SL "ON")

    Less than 1.5 seconds

    ON malfunction (C)

    Calculated input torque

    64 N*m (653 kgf*cm, 47 ft.*lbf) or more at turbine speed 2000 rpm (conditions vary with turbine speed)

    Engine speed

    500 rpm or more

    Accelerator pedal release flag

    OFF

    Time after following condition is met:

    0.15 seconds or more

    - ECM commands

    SC "OFF" and SL "ON"

    ECM commands

    SLU OFF

    Shift position

    "D" or "R" or "B"

    Duration time after shifting from ("N" or "P") to ("D" or "R" or "B")

    1.5 seconds or more

    Ignition switch

    ON

    HINT:

    *: Engine speed - Turbine speed when ECM commands not (SC "OFF" and SL "ON") to ECM commands (SC "OFF" and SL "ON")

TYPICAL MALFUNCTION THRESHOLDS

P0741:

  • OFF malfunction
    • Any of the following conditions are met: OFF malfunction (A) or (B)

      OFF malfunction (A)

      Turbine speed - Input speed

      300 rpm or more

      OFF malfunction (B)

      Engine speed - Turbine speed

      250 rpm or more

  • ON malfunction
    • ON malfunction (A) and (C) are met or ON malfunction (B) and (C) are met:

      ON malfunction (A)

      Turbine speed variation per second when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

      550 rpm per 150 msec. or more at maximum turbine speed 800 rpm at shift "D"

      (conditions vary with maximum turbine speed after shifting from "N" to ("D" or "R") or shifting from "P" to "R")

      450 rpm per 150 msec. or more at maximum turbine speed 800 rpm at shift "R"

      (conditions vary with maximum turbine speed after shifting from "N" to ("D" or "R") or shifting from "P" to "R")

      Duration time of engaging forward or reverse clutch when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

      Less than 2 seconds at shift "D" or "R"

      ON malfunction (B) and (C)

      Engine speed - Turbine speed

      Less than 25 rpm

P075B:

  • OFF malfunction
    • Both of the following conditions are met: OFF malfunction (A) and (B)

      OFF malfunction (A)

      Turbine speed variation per second when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

      550 rpm per 150 msec. or more at maximum turbine speed 800 rpm at shift "D"

      (conditions vary with maximum turbine speed after shifting from "N" to ("D" or "R") or shifting from "P" to "R")

      450 rpm per 150 msec. or more at maximum turbine speed 800 rpm at shift "R"

      (conditions vary with maximum turbine speed after shifting from "N" to ("D" or "R") or shifting from "P" to "R")

      Duration time of engaging forward or reverse clutch when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

      Less than 2 seconds at shift "D" or "R"

      OFF malfunction (B)

      Engine speed - Turbine speed

      Less than 25 rpm

  • ON malfunction
    • Any of the following conditions are met: ON malfunction (A) or (B)

      ON malfunction (A)

      Turbine speed - Input speed

      300 rpm or more

      ON malfunction (B)

      Engine speed - Turbine speed

      250 rpm or more

P2757:

  • OFF malfunction

    Engine speed - Turbine speed

    250 rpm or more

  • ON malfunction
    • ON malfunction (A) and (C) are met or ON malfunction (B) and (C) are met:

      ON malfunction (A)

      Duration time from (a) to (b)

      Less than 0.35 seconds

      (at Engine speed - Turbine speed when Lock Up commands* is 400 rpm (Conditions vary with Engine speed - Turbine speed when Lock Up commands*))

      (a) ECM commands not (SC "OFF" and SL "ON") to ECM commands (SC "OFF" and SL "ON")

      -

      (b) Engine speed - Turbine speed

      Less than 50 rpm

      ON malfunction (B)

      Time after following condition is met:

      0.05 sec. or more

      Engine speed once after engine speed is 400 rpm or more

      Less than 55 rpm

      ON malfunction (C)

      Engine speed - Turbine speed

      Less than 25 rpm

      HINT:

      *: Engine speed - Turbine speed when ECM commands not (SC "OFF" and SL "ON") to ECM commands (SC "OFF" and SL "ON")

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 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Drive the vehicle and confirm the lock-up on and off conditions according to Road Test. [*1]

    Click here 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]; K313 (CVT): 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 / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P0741, P075B or P2757.
  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.

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 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  • Perform initialization when parts related to the continuously variable transaxle system are replaced.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION

  • Check that no DTCs are stored after performing initialization.

    Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P0741, P075B AND P2757)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(e) Read the DTCs using the Techstream.

HINT:

If any DTCs other than P0741, P075B or P2757 are output, perform troubleshooting for those DTCs first.

Result

Proceed to

Only DTC P0741, P075B and/or P2757 is output

A

DTC P0741, P075B and/or P2757 and other DTCs are output

B

B

GO TO DTC CHART 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

A

2.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs

NEXT

3.

PERFORM DRIVE TEST

CAUTION:

Strictly observe posted speed limits, traffic laws and road conditions when performing a drive 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.

HINT:

  • Lock-up control will not operate when the CVT fluid temperature is 40°C (104°F) or less and the vehicle speed is 60 km/h (37 mph) or less, or when the CVT fluid temperature is 5°C (41°F) or less.
  • Lock-up control will not operate when the engine coolant temperature is 30°C (86°F) or less.
  • The lock-up OFF vehicle speed may vary depending on electrical load, and air conditioning and brake operation.

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed, SPD (NT), SPD (NIN), Lock Up, SL Solenoid Status and Solenoid (SC).

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

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

Min.: 0 rpm

Max.: 16383 rpm

700 to 800 rpm: Engine idling

When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

SPD (NT)

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

Data is displayed in increments of 50 rpm.

SPD (NIN)

Primary pulley speed (NIN)

Min.: 0 rpm

Max.: 65535 rpm

  • 0 rpm: Vehicle stopped
  • Equal to engine speed (NE): Lock-up ON (After warming up engine)

Data is displayed in increments of 50 rpm.

Lock Up

Lock-up

OFF or ON

  • ON: Lock-up operating
  • OFF: Lock-up not operating

-

SL Solenoid Status

Shift solenoid valve SL status

OFF or ON

  • ON: Lock-up permitted
  • OFF: Lock-up not permitted

-

Solenoid(SC)

Shift solenoid valve SC status

OFF or ON

  • ON: For 1 second after moving shift lever from P to D or R, or N to D or R
  • ON: Lock-up ON to OFF
  • OFF: Engine idling

-

Powertrain > Engine and ECT > Data List

Tester Display

SPD (NIN)

Lock Up

SL Solenoid Status

Solenoid(SC)

Engine Speed

SPD (NT)

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

SPD (NT)

SPD (NIN)

Lock Up

SL Solenoid Status

Solenoid(SC)

Result

Proceed to

When Lock Up is ON, the value of SPD (NT) is lower than the value of Engine Speed.

A

When SL Solenoid Status and Solenoid (SC) are OFF, the value of SPD (NT) is equal to the value of Engine Speed.

When SL Solenoid Status and Solenoid (SC) are ON, the difference between the value of SPD (NT) and SPD (NIN) is large.

When Lock Up is ON, the value of SPD (NT) is equal to the value of Engine Speed.

B

When SL Solenoid Status and Solenoid (SC) are OFF, the value of SPD (NT) is lower than the value of Engine Speed.

When SL Solenoid Status and Solenoid (SC) are ON, the SPD (NT) is equal to the value of SPD (NIN).

B

CHECK FOR INTERMITTENT PROBLEMS

A

4.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: COMPONENTS

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5.

REPLACE TORQUE CONVERTER ASSEMBLY

(a) Replace the torque converter assembly.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY: COMPONENTS

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PERFORM INITIALIZATION