Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Pressure Control Solenoid "M" Actuator Stuck Off (P08C37F,P091400)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120 (cvt) / Continuously Variable Transaxle System / Pressure Control Solenoid "M" Actuator Stuck Off (P08C37F,P091400)

DESCRIPTION

Using the current from the TCM, the shift solenoid valve SLG controls the B1 brake when the shift lever is in R, and controls the S1 synchronizer when the shift lever is in P, N, D or M.

When the TCM requests the shift mode to be changed to gear mode, the S1 synchronizer is engaged and input torque is transferred to the 1st gear.

When the TCM requests the shift mode to be changed to belt mode and certain conditions are met, the S1 synchronizer is released and input torque is not transferred to the 1st gear.

The shift stroke sensor detects the S1 synchronizer position using the magnet on the shift fork, and sends signals to the TCM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P08C37F

Pressure Control Solenoid "M" Actuator Stuck Off

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

  • When the TCM commands the S1 synchronizer to be engaged, the shift stroke sensor output value is less than 9.205 mm (0.362 in.) for 4 seconds or more.
  • When the TCM commands the S1 synchronizer to be released, the shift stroke sensor output value is 9.205 mm (0.362 in.) or more for 3 seconds or more.
  • When the TCM commands the S1 synchronizer to be released, the shift stroke sensor output value is 1.498 mm (0.0590 in.) or more for 8 seconds or more.
  • Transmission valve body assembly (shift solenoid valve SLG)
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P08C4

P091400

Gear Shift Position Circuit Range/Performance

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

  • When the TCM commands the S1 synchronizer to be engaged, the shift stroke sensor output value is less than 9.205 mm (0.362 in.) for 4 seconds or more.
  • When the TCM commands the S1 synchronizer to be released, the shift stroke sensor output value is 9.205 mm (0.362 in.) or more for 3 seconds or more.
  • When the TCM commands the S1 synchronizer to be released, the shift stroke sensor output value is 1.498 mm (0.0590 in.) or more for 8 seconds or more.
  • Shift stroke sensor
  • Continuously variable transaxle assembly

Comes on

DTC stored

SAE Code:

P0915

MONITOR DESCRIPTION

With the shift lever in P, N, D or M, the shift solenoid valve SLG controls the S1 synchronizer and moves it to the requested position according to the requested shift mode.

When the TCM detects that the S1 synchronizer is not in the appropriate position, it determines that the shift solenoid valve SLG or shift stroke sensor is malfunctioning, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

*: at CVT fluid temperature 80°C (176°F)

(Conditions vary with CVT fluid temperature)

Related DTCs

P08C4: Pressure control solenoid "M" (Shift solenoid valve SLG)/Functional check

P0915: Gear shift position (SFV)/Rationality fault diagnostics

Required sensors/Components

Crankshaft position sensor

Transmission revolution sensor (NC1)

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 SLG

Frequency of operation

Continuous

Duration

P08C4:
  • OFF malfunction (A): 4 sec.

    OFF malfunction (B): 2 sec.

    ON malfunction (A): 3 sec.

    ON malfunction (B): 3 sec.

    ON malfunction (C): 8 sec.*

P0915:
  • OFF malfunction (A): 4 sec.

    OFF malfunction (B): 2 sec.

    ON malfunction (A): 3 sec.

    ON malfunction (B): 3 sec.

    ON malfunction (C): 8 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 "K" circuit

(Shift solenoid valve SLS)

Not circuit malfunction

(MIL illuminated by following codes: P282F, P2830)

Pressure Control Solenoid "M" circuit

(Shift solenoid valve SLG)

Not circuit malfunction

(MIL illuminated by following codes: P08CA, P08CB)

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)

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)

P08C4:
  • OFF malfunction (A)

    Shift position

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

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Engine speed

    500 rpm or more

    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

    ON malfunction (A)

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

    ON malfunction (B)
    *It is calculated, when TCM switch indicate from synchronizer engaged to release

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

    Belt mode clutch

    Engaged

    Synchronizer output speed - Synchronizer input speed*

    100 rpm or more

    Output speed

    500 rpm or more

    ON malfunction (C)

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

P0915:
  • OFF malfunction (A)

    Shift position

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

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Engine speed

    500 rpm or more

    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

    ON malfunction (A)

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

    ON malfunction (B)

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

    ON malfunction (C)

    Shift position

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

    Gear mode clutch

    Released

    Reverse clutch

    Released

    Shift solenoid valve SLP

    Operating shift control by TCM command

    Shift solenoid valve SLG

    Operating synchronizer control by TCM command

    Engine speed

    500 rpm or more

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

    -

    (a) Gear mode clutch speed

    Less than 4500 rpm

    (b) Time after following condition is met

    at CVT fluid temperature 80°C (176°F)

    (Conditions vary with CVT fluid temperature)

    60 sec. or more

    - Engine speed

    400 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

P08C4:
  • OFF malfunction
    • All of the following conditions are met OFF malfunction (A)

      TCM indicate synchronizer

      Engagement

      Synchronizer

      Not engaged

      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)

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

      TCM indicate synchronizer

      Release

      Synchronizer

      Engaged

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

      l Synchronizer input speed - Synchronizer output speed l

      Less than 100 rpm

      ON malfunction (C)

      TCM indicate synchronizer

      Release

      Synchronizer

      Not released

P0915:
  • OFF malfunction
    • All of the following conditions are met OFF malfunction (A)

      TCM indicate synchronizer

      Engagement

      Synchronizer

      Not engaged

      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)

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

      TCM indicate synchronizer

      Release

      Synchronizer

      Engaged

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

      l Synchronizer input speed - Synchronizer output speed l

      300 rpm or more

      ON malfunction (C)

      TCM indicate synchronizer

      Release

      Synchronizer

      Not released

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: P08C37F or P091400.
  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 P08C37F or P091400 are output, perform troubleshooting for those DTCs first.

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P08C37F AND P091400)

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

HINT:

  • If DTC P08C312 or P08C314 is output, perform troubleshooting for that DTC first.
  • If DTCs P08C312 and P08C314 are not output but DTC P091412 or P091414 is output, perform troubleshooting for DTC P091412 or P091414 first.

Result

Proceed to

Only DTC P08C37F and/or P091400 is output

A

DTC P08C37F and/or P091400 and P08C312 are output

B

DTC P08C37F and/or P091400 and P08C314 are output

C

DTC P08C37F and/or P091400 and P091412 are output

D

DTC P08C37F and/or P091400 and P091414 are output

E

DTC P08C37F and/or P091400 and DTCs other than P08C312, P08C314, P091412 and P091414 are output

F

B

GO TO DTC CHART (DTC P08C312)

C

GO TO DTC CHART (DTC P08C314)

D

GO TO DTC CHART (DTC P091412)

E

GO TO DTC CHART (DTC P091414)

F

GO TO DTC CHART

A

2.

INSPECT SHIFT STROKE SENSOR

(a) Connect 3 new dry-cell batteries (1.5 V each) in series.

(b) Prepare a magnet or equivalent tool.

(c) Remove the shift stroke sensor.

Click here

(d) Connect a positive (+) lead from the batteries to terminal 2 (VDD) and a negative (-) lead to terminal 3 (GND).

*a

Component without harness connected

(Shift Stroke Sensor)

*b

Magnet Movement Direction

*c

Dry Cell Battery

*d

Magnet

*e

2.6 mm or less

-

-

(e) Wave the magnet left and right 2.6 mm (0.102 in.) or less from the tip of the shift stroke sensor to output a high/low signal while measuring the voltage.

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

Standard Voltage (Combined Dry-cell Battery Voltage of 4.5 V):

Tester Connection

Condition

Specified Condition

4 (VOUT) - 3 (GND)

High signal

4.09 to 4.19 V

Low signal

0.36 to 0.45 V

Reference Voltage (Combined Dry-cell Battery Voltage of 5.0 V):

Tester Connection

Condition

Specified Condition

4 (VOUT) - 3 (GND)

High signal

4.55 to 4.65 V

Low signal

0.4 to 0.5 V

(g) Install the shift stroke sensor.

Click here

NG

REPLACE SHIFT STROKE SENSOR

OK

3.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SLG)

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

Click here

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SLG

*a

Component without harness connected

(Shift Solenoid Valve SLG)

-

-

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

OK:

Valve moves and makes an operating sound.

NG

GO TO STEP 5

OK

4.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

5.

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

    READ NEXT:

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