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Hydraulic Test

  1. PERFORM HYDRAULIC TEST 
    1. Measure the line pressure.
      NOTE:
      • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F)
      • The line pressure test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is performing the test.
      • Be careful to prevent SST hose from interfering with the exhaust pipe.
      • This Check must be conducted after checking and adjusting engine.
      • Perform under condition that A/C is OFF.
      • When conducting stall test, do not continue more than 5 seconds.
        Fig 1: Measuring Line Pressure With SST
        G05823975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Warm up the ATF (Automatic Transmission Fluid).
      2. Lift the vehicle up.
      3. Remove the test plug on the transmission case center right side and connect SST.

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

      4. Lower the vehicle.
      5. Fully apply the parking brake and chock the 4 wheels.
      6. Start the engine and check idling speed.
      7. Keep your left foot pressing firmly on the brake pedal and shift into D position.
      8. Measure the line pressure when the engine is idling.
      9. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.
      10. In the same manner, do the test in R position.

        Specified line pressure: 

        LINE PRESSURE SPECIFICATION

        Condition D position kPa (kgf / cm2 , psi) R position kPa (kgf/cm2 , psi)
        Idling 355 to 425 kPa (3.6 to 4.3 kgf/cm2 , 51 to 62 psi) 495 to 596 kPa (5.0 to 6.1 kgf/cm2 , 72 to 86 psi)
        Stall test 1300 to 1410 kPa (13.3 to 14.4 kgf/cm2 , 189 to 204 psi) 1462 to 1670 kPa (14.9 to 17.0 kgf/cm2 , 212 to 242 psi)

        Evaluation: 

        PROBLEM POSSIBLE CAUSE CHART

        Problem Possible cause
        If the measured values at all position are higher
        • Shift solenoid valve (SLT) defective
        • Regulator valve defective
        If the measured values at all position are lower
        • Shift solenoid valve (SLT) defective
        • Regulator valve defective
        • Oil pump defective
        If pressure is low in the D position only
        • D position circuit fluid
        • leak Clutch No.1 (C1 ) defective
        If pressure is low in the R position only
        • R position circuit fluid leak
        • Clutch No.3 (C3 ) defective
        • Brake No.4 (B4 ) defective
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