Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off (P27567F)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off (P27567F)

DESCRIPTION

The ECM controls the shift solenoid valve SLU using a predetermined current, and performs lock-up and flex lock-up control.

The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical malfunctions of the shift solenoid valve SLU, transmission valve body assembly and torque converter assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P27567F

Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off

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

SLU stuck ON malfunction:
  • Engine coolant temperature is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the ECM sends a lock-up off request (no malfunctions are detected in the shift solenoid valves SL1, SL2, SL3, SL4, SL5, S1 and SLU, transmission revolution sensors (NT, NC3, NC), engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle, crankshaft position sensor or CAN2)
  • The difference between the input turbine speed (NT) and the engine speed (NE) is less than 35 rpm
  • 1.8 seconds or more
  • 2-trip detection logic
SLU stuck OFF malfunction:
  • Engine coolant temperature is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the ECM sends a lock-up on request (no malfunctions are detected in the shift solenoid valves SL1, SL2, SL3, SL4, SL5, S1 and SLU, transmission revolution sensors (NT, NC3, NC), engine coolant temperature sensor, ATF temperature sensor, knock control sensor, electronic throttle, crankshaft position sensor or CAN2)
  • The difference between the input turbine speed (NT) and the engine speed (NE) is 70 rpm or more
  • 3.5 seconds or more
  • 2-trip detection logic
  • Shift solenoid valve SLU
  • Transmission valve body assembly
  • Torque converter assembly
  • Automatic transaxle assembly

Comes on

DTC stored

SAE Code:

P2757

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT, NC), engine speed, engine load, engine temperature, vehicle speed, ATF temperature and gear selection signals. The ECM determines the lock-up status of the torque converter assembly by comparing the engine speed (NE) to the transmission revolution sensor (NT) signal. The ECM calculates the actual gear by comparing the transmission revolution sensor (NT) signal to the transmission revolution sensor (NC) signal. When conditions are appropriate, the ECM requests "lock-up" by applying voltage to the shift solenoid valve SLU. When the shift solenoid valve SLU is turned on, pressure is applied to the lock-up relay valve and locks the torque converter assembly.

If the ECM does not detect lock-up after lock-up has been requested or if it detects lock-up when it is not requested, it interprets this as a malfunction of the shift solenoid valve SLU, illuminates the MIL and stores this DTC.

HINT:

Example:

When any of the following is met, the system judges it as a malfunction.

  • There is a difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter assembly when the ECM commands lock-up. (Engine speed is at least 70 rpm more than input turbine speed.)
  • There is no difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter assembly when the ECM commands lock-up off. (The difference between engine speed and input turbine speed is less than 35 rpm.)

MONITOR STRATEGY

Related DTCs

P2757: Shift solenoid valve SLU/OFF malfunction

Required sensors/Components

Shift solenoid valve SLU

Frequency of operation

Continuous

Duration

OFF malfunction: 3.5 sec.

ON malfunction: 1.8 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever this DTC is not present.

(Not circuit malfunction)

P0717, P07BF, P07C0 (Turbine 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)

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

P2759 (Shift solenoid valve SLU circuit)

P0115, P0117, P0118 (ECT sensor circuit)

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

ECT

40°C (104°F) or more

Spark advance from MAX. retard timing by KCS control

0 °CA or more

TCM selected gear

Not 1st

Vehicle speed

25 km/h (15.62 mph) or more

TCM selected gear and transaxle actual gear

Match
  • When either condition below is met: Condition (1) or (2)
    • Condition (1)

      When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

      Condition (a)

      Turbine speed / Output speed (NT / NO)

      (Actual 1st gear)

      4.197 or more and 8.529 or less

      (when output speed less than 130 rpm)
      Condition (b)

      Turbine speed / Output speed (NT / NO)

      (Actual 2nd gear)

      2.599 or more and 3.108 or less

      (when output speed less than 200 rpm)
      Condition (c)

      Turbine speed / Output speed (NT / NO)

      (Actual 3rd gear)

      1.712 or more and 1.962 or less

      (when output speed less than 400 rpm)
      Condition (d)

      Turbine speed / Output speed (NT / NO)

      (Actual 4th gear)

      1.289 or more and 1.455 or less

      (when output speed less than 600 rpm)
      Condition (e)

      Turbine speed / Output speed (NT / NO)

      (Actual 5th gear)

      1.064 or more and 1.233 or less

      (when output speed less than 600 rpm)
      Condition (f)

      Turbine speed / Output speed (NT / NO)

      (Actual 6th gear)

      0.88 or more and 1.004 or less

      (when output speed less than 800 rpm)
      Condition (g)

      Turbine speed / Output speed (NT / NO)

      (Actual 7th gear)

      0.701 or more and 0.825 or less

      (when output speed less than 800 rpm)
      Condition (h)

      Turbine speed / Output speed (NT / NO)

      (Actual 8th gear)

      0.585 or more and 0.683 or less

      (when output speed less than 1000 rpm)
    • Condition (2)

      When all of the following conditions are met: Condition (a), (b), (c), (d), (e), (f), (g) and (h)

      Condition (a)

      Turbine speed - Output speed x 1st gear ratio

      (Actual 1st gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 130 rpm or more)
      Condition (b)

      Turbine speed - Output speed x 2nd gear ratio

      (Actual 2nd gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 200 rpm or more)
      Condition (c)

      Turbine speed - Output speed x 3rd gear ratio

      (Actual 3rd gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 400 rpm or more)
      Condition (d)

      Turbine speed - Output speed x 4th gear ratio

      (Actual 4th gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 600 rpm or more)
      Condition (e)

      Turbine speed - Output speed x 5th gear ratio

      (Actual 5th gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 600 rpm or more)
      Condition (f)

      Turbine speed - Output speed x 6th gear ratio

      (Actual 6th gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 800 rpm or more)
      Condition (g)

      Turbine speed - Output speed x 7th gear ratio

      (Actual 7th gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 800 rpm or more)
      Condition (h)

      Turbine speed - Output speed x 8th gear ratio

      (Actual 8th gear)

      -50 rpm or more and 50 rpm or less

      (when output speed 1000 rpm or more)
OFF malfunction

TCM indicated pressure value of SLU

715 kPa (7.3 kgf/cm2, 104 psi) or more

TCM indicated S1 solenoid

OFF

TCM indicated S2 solenoid

OFF
ON malfunction

TCM indicated pressure value of SLU

Less than 4 kPa (0.04 kgf/cm2, 0.6 psi)

Throttle valve opening angle

7% or more at turbine speed 3000 rpm

(conditions vary with turbine speed)

Vehicle speed

Less than 60 km/h (37.5 mph)

Calculated load value

23.25% or more at turbine speed 3000 rpm

(conditions vary with turbine speed)

TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction

Engine Speed - Turbine speed

70 rpm or more
ON malfunction

Engine Speed - Turbine speed

Less than 35 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. 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 Lock-up Function 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: P27567F.
  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 P27567F)

(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

Only DTC P27567F is output

A

DTC P27567F and other DTCs are output

B

HINT:

  • If any DTCs other than P27567F 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 SLU

(a) Remove the shift solenoid valve SLU.

Click here

*a

Component without harness connected

(Shift Solenoid Valve SLU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve SLU 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 SLU

OK

3.

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

4.

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

5.

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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