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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
        G05289558Courtesy 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: 

        SPECIFIED LINE PRESSURE CHART

        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) 485 to 585 kPa (4.9 to 6.0 kgf/cm2 , 70 to 85 psi)
        Stall test 1041 to 1151 kPa (10.6 to 11.7 kgf/cm2 , 151 to 167 psi) 1181 to 1389 kPa (12.1 to 14.2 kgf/cm2 , 172 to 202 psi)

        Evaluation: 

        EVALUATION 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 (CO 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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