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Hydraulic Test

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
  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).
        Fig 1: Identifying Line Pressure
        G04831014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • The line pressure test must always be carried out by pairs of technicians. One technician must observe the condition of the wheels and wheel stoppers outside the vehicle, while the other is performing the test.
      • Prevent the SST hose from interfering with the exhaust pipe.
      • This test must be conducted after checking and adjusting the engine.
      • Perform this test with the air conditioning OFF.
      • Do not continue the stall test for more than 5 seconds.
      1. Warm up the ATF.
      2. Lift the vehicle up.
      3. Remove the engine under cover.
      4. Remove the test plug on the transmission case center right side and connect SST.

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

      5. Connect the Techstream to the DLC3.
      6. Fully apply the parking brake and chock all 4 wheels.
      7. Start the engine and check the idling speed.
      8. Keep your left foot pressing firmly on the brake pedal and shift into the D position.
      9. Measure the line pressure when the engine is idling.
      10. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.
      11. Perform the test in the R position in the same manner.

        Standard line pressure 

        STANDARD LINE PRESSURE

        Condition D position kPa (kgf/cm2 , psi) R position kPa (kgf/cm2 , psi)
        Idling 372 to 412 kPa (3.8 to 4.2 kgf/cm2 , 54 to 60 psi) 553 to 623 kPa (5.6 to 6.4 kgf/cm2 , 80 to 90 psi)
        Stall 1,126 to 1,226 kPa (11.5 to 12.5 kgf/cm2 , 163 to 178 psi) 1,664 to 1,864 kPa (17.0 to 19.0 kgf/cm2 , 241 to 270 psi)

        Evaluation: 

        PROBLEM AND POSSIBLE CAUSE

        Problem Possible Cause
        Measured values are higher than specified values in all positions
        • Shift solenoid valve SLT defective
        • Regulator valve defective
        Measured values are lower than specified values in all positions
        • Shift solenoid valve SLT defective
        • Regulator valve defective
        • Oil pump defective
        Pressure is low in D position only
        • D position circuit fluid leak
        • Forward clutch defective
        Pressure is low in R position only
        • R position circuit fluid leak
        • Reverse clutch defective
        • 1st and reverse brake defective
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