Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Pressure Control Solenoid "A" Actuator Stuck Off (P07457F)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120f (cvt) / Continuously Variable Transaxle System / Pressure Control Solenoid "A" Actuator Stuck Off (P07457F)

DESCRIPTION

Using the current from the TCM, the shift solenoid valve SL1 controls the C1 clutch pressure in accordance with the requested shift mode.

When the TCM requests the shift mode to be changed to gear mode, the C1 clutch is engaged and the input torque is transmitted to the 1st gear via the forward clutch drum.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P07457F

Pressure Control Solenoid "A" Actuator Stuck Off

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

  • 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.
  • The time between when the TCM commands the C1 clutch to be engaged and when the C1 clutch is actually engaged is less than 0.2 seconds.
  • Transmission valve body assembly (shift solenoid valve SL1)
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P0746

MONITOR DESCRIPTION

When the TCM requests the shift mode to be changed to gear mode, the shift solenoid valve SL1 is turned ON and the C1 clutch is engaged. As a result, the transmission revolution sensor (NT) signal becomes equal to the transmission revolution sensor (NC1) signal.

By comparing the signals indicating the input shaft revolution (speed) and intermediate shaft (C1 clutch) revolution (speed), the TCM judges if the shift mode is gear mode or not.

When the TCM requests the shift mode to be changed to gear mode, if the difference between the transmission revolution sensor (NT) and (NC1) signals is more than 200 rpm, it determines that the shift solenoid valve SL1 is malfunctioning, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

P0746: Pressure control solenoid "A" (Shift solenoid valve SL1)/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): 1 sec.

OFF malfunction (B): 2 sec.

OFF malfunction (C): 1 sec.

ON malfunction (A): -

ON malfunction (B): 0.5 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)
OFF 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
OFF 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
OFF 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
ON malfunction (A)

Engine speed

800 rpm or more and less than 2000 rpm

Time after following condition is met

2 sec. 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 ("P" or "N") to ("D" or "B")

650 rpm or more

(When engine speed when shifting from ("P" or "N") to ("D" or "B") is 800 rpm)

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

Gear mode clutch speed when shifting from ("P" or "N") to ("D" or "B")

100 rpm or more

TCM selected

Gear mode

Output speed

400 rpm or less

Shift position

("D" or "B") and "not P" and "not R" and "not N"

Turbine speed - Gear mode clutch speed

Less than 100 rpm

Synchronizer

Engaged

Maximum turbine speed after shifting from ("P" or "N") to ("D" or "B")

1000 rpm or more

(When transmission fluid temperature is 80°C (176°F))

(Conditions vary with transmission fluid temperature)
ON 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

Output speed (NOUT)

More than 80 rpm

TYPICAL MALFUNCTION THRESHOLDS

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

    TCM indicate gear mode clutch

    Engagement

    l Turbine Speed - Gear Mode Clutch speed l

    More than 200 rpm
    OFF malfunction (B) (after OFF 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)
    OFF malfunction (C) (after OFF malfunction (A) and (B) are met)

    TCM indicate belt mode clutch

    Engagement

    l Secondary Sheave speed - Output speed l

    Less than 25 rpm
ON malfunction
  • Both of the following conditions are met: ON malfunction (A) and (B)

    ON malfunction (A)

    • Both of the following conditions are met: Condition (1) and (2) Condition (1)

      Duration time after following condition is met:

      Less than 0.076 sec.

      (When maximum turbine speed after shifting from ("P" or "N") to ("D" or "B") is 800 rpm and transmission fluid temperature is 80°C (176°F))

      (Conditions vary with maximum turbine speed after shifting from ("P" or "N") to ("D" or "B") and transmission fluid temperature)

      After shifting from ("P" or "N") to ("D" or "B")

      -

      Turbine speed - Gear mode clutch speed

      100 rpm or more

      Engine speed - Turbine speed

      More than 125 rpm

      Maximum turbine speed after shifting from ("P" or "N") to ("D" or "B") - turbine speed

      50 rpm or more
      Condition (2)

      Duration time after following condition is met:

      Less than 0.2 sec.

      (When maximum turbine speed after shifting from ("P" or "N") to ("D" or "B") is 800 rpm and transmission fluid temperature is 80°C (176°F))

      (Conditions vary with maximum turbine speed after shifting from ("P" or "N") to ("D" or "B") and transmission fluid temperature)

      After shifting from ("P" or "N") to ("D" or "B")

      -

      Turbine speed - Gear mode clutch speed

      100 rpm or more
    ON malfunction (B) (after ON malfunction (A) is met)

    • TCM indicate gear mode clutch

      Engagement

      l Turbine Speed - Gear Mode Clutch 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: P07457F.
  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 P07457F are output, perform troubleshooting for those DTCs first.

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P07457F)

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

HINT:

  • If DTC P074512 or P074514 is output, perform troubleshooting for that DTC first.
  • If DTCs P074512 and P074514 are not output but DTC P281F00 is output, perform troubleshooting for DTC P281F00 first.
  • If DTCs P074512, P074514 and P281F00 are not output but DTC P07757F is output, perform troubleshooting for DTC P07757F first.

Result

Proceed to

Only DTC P07457F is output

A

DTC P07457F and P074512 are output

B

DTC P07457F and P074514 are output

C

DTC P07457F and P281F00 are output

D

DTC P07457F and P07757F are output

E

DTC P07457F and DTCs other than P074512, P074514, P07757F and P281F00 are output

F
B

GO TO DTC CHART (DTC P074512)

C

GO TO DTC CHART (DTC P074514)

D

GO TO DTC CHART (DTC P281F00)

E

GO TO DTC CHART (DTC P07757F)

F

GO TO DTC CHART
A

2.

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.

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

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