Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Shift Solenoid "A" Actuator Stuck Off (P07507F)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Shift Solenoid "A" Actuator Stuck Off (P07507F)

DESCRIPTION

Based on signals from the transmission revolution sensors (NT, NC3 and NC), the actual gear is detected.

The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical malfunctions of the shift solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).

Actual gear when shift solenoid valve S1 (without fail-safe control) malfunction occurs:

ECM commanded gear

1st

2nd

3rd

4th

5th

6th

7th

8th
*: With S1, D1 or M1 range (1st gear) selected

Actual gear during S1 stuck OFF malfunction

1st

(3rd)*

2nd

3rd

4th

5th

6th

7th

8th

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P07507F

Shift Solenoid "A" Actuator Stuck Off

1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other

  • Engine coolant temperature is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the vehicle is being driven with S1, D1 or M1 range (1st gear) (no malfunctions are detected in the shift solenoid valves SL1, SL2, SL3, SL4, SL5 and S1, transmission revolution sensors (NT, NC3, NC), coolant temperature sensor, oil temperature sensor, knock control sensor, electronic throttle or CAN2)
  • When the ECM commands the transaxle to shift to 1st gear, the actual gear changes to 3rd gear.
  • Malfunction status continues for 0.6 seconds or more
  • 2-trip detection logic
  • Shift solenoid valve S1
  • Shift solenoid valve SL4
  • Transmission valve body assembly
  • Torque converter assembly
  • Automatic transaxle assembly (clutch, brake, gear, etc.)

Comes on

DTC stored

SAE Code:

P0751

MONITOR DESCRIPTION

This DTC indicates a "stuck OFF" malfunction of the shift solenoid valve S1.

The ECM commands gear shifts by turning the shift solenoid valves on or off. When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0751: Shift solenoid valve S1/OFF malfunction

Required sensors/Components

Shift solenoid valve S1

Frequency of operation

Continuous

Duration

0.6 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever this DTC is not present.

(Not circuit malfunction)

P0717, P07BF, P07C0 (Turbine speed sensor circuit)

P07C1, P07C2, P2767 (Input speed sensor circuit)

P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit)

P0335, P0337, P0338 (Crankshaft Position Sensor "A" circuit) (This condition applies only if using fail-safe)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P0798 (Shift solenoid valve SL3 circuit)

P2810 (Shift solenoid valve SL4 circuit)

P2819 (Shift solenoid valve SL5 circuit)

P0973, P0974 (Shift solenoid valve S1 circuit)

P0115, P0117, P0118 (ECT sensor circuit)

P0712, P0713 (ATF temperature sensor circuit (TFT sensor))

P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D (KCS sensor circuit)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system)

U0100 (CAN communication system)

NSW switch

"D" and "not R" and "not N"

Duration time from shifting "N" to "D"

4 sec. or more

ATF temperature

-10°C (14°F) or more

Engine

Starting

Fail-safe does not active due to following malfunctions:

  

Shift solenoid valve SL1

Not OFF or ON malfunction (P0746)

Shift solenoid valve SL2

Not OFF or ON malfunction (P0776)

Shift solenoid valve SL3

Not OFF or ON malfunction (P0796)

Shift solenoid valve SL4

Not OFF or ON malfunction (P2808)

Shift solenoid valve SL5

Not OFF or ON malfunction (P2817)

Shift solenoid valve S1

Not OFF or ON malfunction (P0751, P0752)

TCM selected gear

1st

Vehicle speed

3 km/h (1.87 mph) or more and less than 38 km/h (23.75 mph)

Engine speed - Turbine speed

150 rpm or more

Calculated load value

7.75% or more

ECT

40°C (104°F) or more

Spark advance from MAX. retard timing by KCS control

0 °CA or more

TCM indicated S1 solenoid

ON

TCM indicated pressure value of SL3

300 kPa (3.1 kgf/cm2, 44 psi) or more

Time after end of brake pressure control

0.2 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

When either condition below is met: (a) or (b)

  

(a) Turbine speed/Output speed (NT/NO)

1.712 or more and 1.962 or less

(When Output speed less than 400 rpm)

(b) Turbine speed - Output speed x 3rd gear ratio

-50 rpm or more and 50 rpm or less

(When Output speed 400 rpm or more)

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. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Start the engine.
  7. 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.

  8. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  9. Input the DTC: P07507F.
  10. 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 automatic transaxle are replaced.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P07507F AND P28077F)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

Result

Proceed to

DTC P07507F and P28077F are output

A

DTCs other than P07507F and P28077F are also output

B

HINT:

  • If any DTCs other than P07507F and P28077F are output, perform troubleshooting for those DTCs first.
  • If a shift solenoid valve is stuck ON or OFF, DTCs for several shift solenoid valves including the malfunctioning shift solenoid valve will be stored.
B

GO TO DTC CHART

A

2.

INSPECT SHIFT SOLENOID VALVE S1

(a) Remove the shift solenoid valve S1.

Click here

*1

Shift Solenoid Valve S1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body

20°C (68°F)

11 to 15 Ω

(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

NG

REPLACE SHIFT SOLENOID VALVE S1

OK

3.

INSPECT SHIFT SOLENOID VALVE SL4

(a) Remove the shift solenoid valve SL4.

Click here

*a

Component without harness connected

(Shift Solenoid Valve SL4)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve SL4 connector terminal 1 - terminal 2

20°C (68°F)

5.0 to 5.6 Ω

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

OK:

Valve moves and makes an operating sound.

NG

REPLACE SHIFT SOLENOID VALVE SL4

OK

4.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Inspect the transmission valve body assembly.

Click here

OK:

There is no foreign matter on each valve and they operate smoothly.

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

5.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Inspect the torque converter assembly.

Click here

OK:

The torque converter assembly is normal.

NG

REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY

OK

6.

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

(a) Repair or replace the automatic transaxle assembly.

Click here

NEXT

PERFORM A/T CODE REGISTRATION

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