Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Pressure Control Solenoid "B" Actuator Stuck Off (P07757F)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120 (cvt) / Continuously Variable Transaxle System / Pressure Control Solenoid "B" Actuator Stuck Off (P07757F)

DESCRIPTION

Using the current from the TCM, the shift solenoid valve SL2 controls the C2 clutch pressure in accordance with the requested shift mode.

When the TCM requests the shift mode to be changed to belt mode, the C2 clutch is engaged and the input torque is transmitted to the output shaft via the steel belt.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P07757F

Pressure Control Solenoid "B" Actuator Stuck Off

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

  • When the TCM commands the C2 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NSS) and (NOUT) is more than 300 rpm for 2 seconds or more.
  • When the TCM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more.
  • Transmission valve body assembly (shift solenoid valve SL2)
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P0776

MONITOR DESCRIPTION

  • When the TCM requests the shift mode to be changed to belt mode, the shift solenoid valve SL2 is turned ON and the C2 clutch is engaged. As a result, the transmission revolution sensor (NSS) signal becomes equal to the transmission revolution sensor (NOUT) signal.

    By comparing the signals indicating the secondary pulley revolution (speed) and output shaft revolution (speed), the TCM judges if the shift mode is belt mode or not.

    When the TCM requests the shift mode to be changed to belt mode, if the difference between the transmission revolution sensor (NSS) and (NOUT) signals is more than 300 rpm, it determines the shift solenoid valve SL2 is malfunctioning, illuminates the MIL and stores this DTC.

  • Under normal conditions, when the TCM requests the shift mode to be changed to gear mode, line pressure is applied from the shift solenoid SL1 to engage the C1 clutch and gear mode is entered.

    When the shift solenoid valve SL2 is stuck ON, if the TCM requests the shift mode to be changed to gear mode, line pressure is applied to the clutch apply control valve from the shift solenoid valve SL2 and in turn line pressure to the C1 clutch is blocked.

    As a result, the C1 clutch cannot be engaged and the shift mode cannot be changed.

    In this case, when the TCM requests the shift mode to be changed to gear mode, it detects that gear mode cannot be entered (the C1 clutch is not engaged and the difference between the transmission revolution sensor (NT) signal and transmission revolution sensor (NC1) signal exceeds the threshold) and determines that the shift solenoid valve SL2 is stuck ON, illuminates the MIL and stores a DTC.

    SL2 Stuck ON Detection Condition:

    *A

    TCM commands C1 clutch engagement when shift solenoid valve SL2 normal

    *B

    TCM commands C1 clutch engagement when shift solenoid valve SL2 stuck ON

    *1

    Shift Solenoid Valve SL1

    *2

    Shift Solenoid Valve SL2

    *3

    Clutch Apply Control Valve

    *4

    C1 Clutch

    *a

    Shift solenoid valve SL2 stuck ON

    -

    -

    Oil Pressure Flow

    Valve Movement

MONITOR STRATEGY

Related DTCs

P0776: Pressure control solenoid "B" (Shift solenoid valve SL2)/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

Frequency of operation

Continuous

Duration

OFF malfunction (A): 2 sec.

OFF malfunction (B): -

OFF malfunction (C): 1 sec.

ON malfunction (A): 1 sec.

ON malfunction (B): 2 sec.

ON malfunction (C): 1 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)

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

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)

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)

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)

Gear shift position circuit

Not circuit malfunction

(MIL illuminated by following codes: P0916, P0917)

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)

Engine

Starting

OFF malfunction (A)

Shift solenoid valve SLP

Operating shift control by TCM command

Engine speed

500 rpm or more

Secondary sheave speed

More than 0 rpm

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

-

(a) Output speed

More than 0 rpm

(b) All of the following conditions are met

-

- Output speed

0 rpm

- Gear mode clutch speed

0 rpm

- Synchronizer

Engaged

OFF malfunction (B)

Shift solenoid valve SLP

Operating shift control by TCM command

Engine speed

500 rpm or more

Synchronizer

Engaged

Turbine torque

40 N*m (408 kgf*cm, 30 ft.*lbf) or more

Accelerator pedal release flag

OFF

OFF malfunction (C)

Engine speed

500 rpm or more

Shift position

"D" or "B"

Secondary sheave torque

40 N*m (408 kgf*cm, 30 ft.*lbf) or more

Accelerator pedal release flag

OFF

Output speed

More than 80 rpm

ON malfunction (A)

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

ON malfunction (B)

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

- l Variation of the accelerator pedal angle l

(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

ON malfunction (C)

Shift solenoid valve SLP

Operating shift control by TCM command

Engine speed

500 rpm or more

Secondary sheave torque

40 N*m (408 kgf*cm, 30 ft.*lbf) or more

Accelerator pedal release flag

OFF

TYPICAL MALFUNCTION THRESHOLDS

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

    TCM indicate belt mode clutch

    Engagement

    l Secondary sheave speed - Output speed l

    More than 300 rpm

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

    TCM indicate gear mode clutch

    Engagement

    l Turbine Speed - Gear mode clutch speed l

    Less than 25 rpm

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

    Shift solenoid valve SLP

    Operating belt mode clutch control by TCM command

    Secondary sheave speed - Output speed

    Less than 25 rpm

ON malfunction
  • All of the following conditions are met: ON malfunction (A), (B) and (C) ON malfunction (A)

    TCM indicate gear mode clutch

    Engagement

    l Turbine Speed - Gear mode clutch speed l

    More than 200 rpm

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

    Target clamping pressure

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

    l Actual clamping pressure - Target clamping pressure l

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

    ON malfunction (C) (after ON malfunction (A) and (B) are met)

    TCM indicate belt mode clutch

    Engagement

    l Secondary sheave speed - Output speed l

    Less than 25 rpm

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

  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. Turn the ignition switch to ON and turn the GTS on.
  4. Start the engine.
  5. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here

    HINT:

    [*1]: Normal judgment procedure.

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

  6. Stop the vehicle.
  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: P07757F.
  9. 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

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

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

HINT:

If any DTCs other than P07757F are output, perform troubleshooting for those DTCs first.

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P07757F)

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

HINT:

  • If DTC P077512 or P077514 is output, perform troubleshooting for that DTC first.
  • If DTCs P077512 and P077514 are not output but DTC P281F00 is output, perform troubleshooting for DTC P281F00 first.

Result

Proceed to

Only DTC P07757F is output

A

DTC P07457F and P07757F are output

B

DTC P07757F and P077512 are output

C

DTC P07757F and P077514 are output

D

DTC P07757F and P281F00 are output

E

DTC P07757F and DTCs other than P07457F, P077512, P077514 and P281F00 are output

F

B

GO TO STEP 5

C

GO TO DTC CHART (DTC P077512)

D

GO TO DTC CHART (DTC P077514)

E

GO TO DTC CHART (DTC P281F00)

F

GO TO DTC CHART

A

2.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL2)

(a) Disconnect the transmission wire connector from the shift solenoid valve SL2.

Click here

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SL2

*a

Component without harness connected

(Shift Solenoid Valve SL2)

-

-

(b) Connect a positive (+) lead from the auxiliary battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the shift solenoid valve SL2 connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

NG

GO TO STEP 4

OK

3.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

4.

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

5.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1)

(a) Disconnect the transmission wire connector from the shift solenoid valve SL1.

Click here

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SL1

*a

Component without harness connected

(Shift Solenoid Valve SL1)

-

-

(b) Connect a positive (+) lead from the auxiliary battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the shift solenoid valve SL1 connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

OK

GO TO STEP 2

NG

6.

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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