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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.
        Fig 1: Measuring Line Pressure
        G05575180Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • 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 10 seconds.
      1. Warm up the ATF:
      2. Remove the test plug on the front left side of the transaxle case and connect SST.

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

      3. Fully apply the parking brake and chock the 4 wheels.
      4. Connect Techstream to the DLC3.
      5. Start the engine and check idling speed.
      6. Keep your left foot pressing firmly on the brake pedal and shift into D position.
      7. Measure the line pressure when the engine is idling.
      8. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.
      9. In the same way, 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 324 to 451 kPa (3.3 to 4.6 kgf/cm2 , 47 to 65 psi) 577 to 817 kPa (5.9 to 8.3 kgf/cm2 , 84 to 118 psi)
        Stall test 713 to 844 kPa (7.27 to 8.61 kgf/cm2 , 103 to 122 psi) 1,520 to 1,755 kPa (15.5 to 17.9 kgf/cm2 , 220 to 254 psi)

        Evaluation: 

        EVALUATION CHART

        Problem Possible cause
        If the measured values at all positions are higher
        • Shift solenoid valve SLT defective
        • Regulator valve detective
        If the measured values at all positions are lower
        • Shift solenoid valve SLT defective
        • Regulator valve detective
        • Oil pump defective
        • O/D direct clutch defective
        If pressure is low in the D position only
        • D position circuit fluid leak
        • Forward clutch defective
        If pressure is low in the R position only
        • R position circuit fluid leak
        • Direct clutch defective
        • 1st and reverse brake defective
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