LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission >> Automatic Transmission System >> Hydraulic Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Hydraulic Test

  1. PERFORM HYDRAULIC TEST 
    1. Measure the line pressure.
    CAUTION: The line pressure test should always be carried out in pairs. One technician should observe the conditions of the wheels and wheel chocks from outside the vehicle while the other is performing the test.
    NOTE:
    • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
    • Be careful to prevent SST hose from interfering with the exhaust pipe.
    • This check must be conducted after checking and adjusting the engine.
    • Perform the test with the A/C turned off.
    • When conducting the stall test, do not continue for more than 5 seconds.
    1. Warm up the ATF (Automatic Transmission Fluid).
    2. Turn the engine switch off.
    3. Lift the vehicle up.
    4. Remove the test plug on the transmission case center right side and connect SST.

      SST 09992-00095 (09992-00231, 09992-00271) 

    5. Lower the vehicle.
    6. Fully apply the parking brake and chock the 4 wheels.
    7. Start the engine and check the idling speed.
    8. Keep your left foot pressed firmly on the brake pedal and move the shift lever to D.
    9. Measure the line pressure when the engine is idling.
    10. Fully depress the accelerator pedal with your right foot. Quickly read the highest line pressure when the engine speed reaches the stall speed.
    11. In the same manner, perform the test with the shift lever in R.
    Fig 1: Identifying Test Plug And SST
    G05154674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Specified Line Pressure 

    SPECIFIED LINE PRESSURE

    Condition D Position kPa (kgf/cm2 , psi) R Position kPa (kgf/cm2 , psi)
    Idling 350 to 430 kPa (3.5 to 4.4 kgf/cm2 , 50 to 63 psi) 540 to 650 kPa (5.5 to 6.7 kgf/cm2 , 78 to 95 psi)
    Stall speed 1370 to 1530 kPa (14.0 to 15 6 kgf/cm2 , 199 to 221 psi) 1540 to 1750 kPa (15.7 to 17.9 kgf/cm2 , 223 to 254 psi)

    Evaluation 

    EVALUATION DESCRIPTION

    Problem Possible Cause
    Measured values at D and R positions are higher than specified pressure
    • Shift solenoid valve SLT defective
    • Regulator valve defective
    Measured values at D and R positions are below specified pressure
    • Shift solenoid valve SLT defective
    • Regulator valve defective
    • Oil pump defective
    Pressure is low in D position only
    • D position circuit fluid leak
    • Clutch No. 1 (C1) defective
    Pressure is low in R position only
    • R position circuit fluid leak
    • Clutch No. 3 (C3) defective
    • Brake No. 4 (B4) defective
scientia non olet · About LEMON Manuals