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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 sure to prevent SST hose from interfering with the exhaust pipe.
      • This check must be conducted after checking and adjusting the engine.
      • Perform the test when the A/C is OFF.
      • When conducting the stall test, do not continue for more than 5 seconds.
        Fig 1: Measuring Line Pressure
        G05836042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Warm up the ATF (Automatic Transmission Fluid).
      2. Remove the test plug on the transaxle case front left side and install the 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 360 to 430 kPa (3.7 to 4.4 kgf/cm2 , 52 to 62 psi) 800 to 950 kPa (8 2 to 9.7 kgf/cm2 , 116 to 138 psi)
        Stall test 1160 to 1350 kPa (11.8 to 13.8 kgf/cm2 , 168 to 196 psi) 1900 to 2200 kPa (19.4 to 22.4 kgf/cm2 , 276 to 319 psi)

        Evaluation: 

        PROBLEM AND POSSIBLE CAUSE

        Problem Possible cause
        Measured values are higher than the specified value in all positions
        • Shift solenoid valve (SLT) defective
        • Regulator valve defective
        Measured values are lower than the specified value in all positions
        • Shift solenoid valve (SLT) defective
        • Regulator valve defective
        • Oil pump defective
        Pressure is low in the D position only
        • D position circuit fluid leak
        • Clutch No 1 (C1 ) defective
        Pressure is low in the R position only
        • R position circuit fluid leak
        • Brake No. 2 (B2 ) defective
        • Brake No. 3 (B3 ) defective
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