K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P07457F; Pressure Control Solenoid "A" Actuator Stuck Off; 2020 - 2025 MY Corolla Corolla Hatchback [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G8NS
Model Year Start: 2020	Model: Corolla Hatchback	Prod Date Range: [01/2019 - ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P07457F; Pressure Control Solenoid "A" Actuator Stuck Off; 2020 - 2025 MY Corolla Corolla Hatchback [01/2019 - ]

DTC

P07457F

Pressure Control Solenoid "A" Actuator Stuck Off

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

DTC Detection Condition Patterns:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	TCM commands the C1 clutch to be engaged	○	○
Malfunction Condition	Difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm	○	-
Malfunction Condition	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	-	○
Duration		1 second or more	-
Detection Logic		2-trip detection logic	2-trip detection logic

HINT:

This DTC is stored when any of the above detection patterns is met.

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
- 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 (C)

Shift solenoid valve SLP	Operating shift control by TCM command
Engine speed	500 rpm or more
Secondary sheave torque	40 Nm (408 kgfcm, 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 Nm (408 kgfcm, 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
Turbine Speed - Gear mode clutch speed	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
Actual clamping pressure - Target clamping pressure	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
Secondary sheave speed - Output speed	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
Turbine speed - Gear mode clutch speed	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

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for 2 minutes or more.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine.
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.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P07457F.

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

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) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

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

GO TO DTC CHART (DTC P074512)

GO TO DTC CHART (DTC P074514)

GO TO DTC CHART (DTC P281F00)

GO TO DTC CHART (DTC P07757F)

GO TO DTC CHART

2.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1)

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

Click here

Transmission Valve Body Assembly

Shift Solenoid Valve SL1

Component without harness connected

(Shift Solenoid Valve SL1)

(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 SL1 connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

GO TO STEP 4

3.	REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

Click here

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

4.	REPLACE TRANSMISSION VALVE BODY ASSEMBLY

(a) Replace the transmission valve body assembly.

Click here

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here