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Hydraulic Test

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  1. PERFORM HYDRAULIC TEST 
    1. Measure the line pressure.
      Fig 1: Identifying Line Pressure
      G05582807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Perform the test at the normal operating ATF temperature: 50 to 80°C (122 to 176°F).
      • The line pressure test should always be performed with at least 2 people. One person should observe the condition of the wheels or wheel chocks while the other is performing the test.
      • Be careful to prevent SST's hose from interfering with the exhaust pipe.
      • This test must be performed after checking and adjusting the engine.
      • Perform the test with the A/C OFF.
      • When conducting the stall test, do not continue for more than 10 seconds.
      1. Warm up the ATF (Automatic Transmission Fluid).
      2. Lift the vehicle up.
      3. Remove the engine under cover.
      4. Connect Techstream to the DLC3.
      5. Remove the test plug A on the transaxle case front left side and install SST.

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

        NOTE: There is a difference between the installation point of the D position and R position.
      6. Start the engine.
      7. Using Techstream, shift to D position and hold 3rd gear by active test, and measure the line pressure in idling.

        Specified line pressure: 

        SPECIFIED LINE PRESSURE

        Condition D position kPa (kgf/cm2 , psi)
        Idling 372 to 412 kPa (3.8 to 4.2 kgf/cm2 , 54 to 60 psi)
      8. Turn the ignition switch off.
      9. Disconnect the connector of the transmission wire.

        HINT:

        Disconnect the connector only when performing the D position stall test.

      10. Start the engine.
      11. Firmly depress the brake pedal, shift to the D position, depress the accelerator pedal all the way down and check the line pressure while the stall test is performed.

        Specified line pressure: 

        SPECIFIED LINE PRESSURE

        Condition D position kPa (kgf/cm2 , psi)
        Stall test 931 to 1,031 kPa (9.5 to 10.5 kgf/cm2 , 135 to 150 psi)
      12. Turn the ignition switch off.
      13. Remove SST, and install the test plug A.
      14. Remove the test plug B, install SST and start the engine.

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

      15. Connect the transmission wire connector, depress the brake pedal firmly, shift to the R position and check the line pressure while the engine is idling and during the stall test.

        Specified line pressure: 

        SPECIFIED LINE PRESSURE

        Condition R position kPa (kgf/cm2 , psi)
        Idling 672 to 742 kPa (6.9 to 7.6 kgf/cm2 , 97 to 108 psi)
        Stall test 1,768 to 1,968 kPa (18.0 to 20.0 kgf/cm2 , 256 to 285 psi)
      16. Remove SST, and install the test plug B.
      17. Clear the DTC.

        Evaluation: 

        RESULT CHART

        Problem Possible cause
        Measured values at all positions are higher than specified
        • Shift solenoid valve SLT defective
        • Regulator valve defective
        Measured values at all positions are lower than specified
        • Shift solenoid valve SLT defective
        • Regulator valve defective
        • Oil pump defective
        • U/D (underdrive) direct clutch defective
        Pressure is low when shift lever is on D only
        • D position circuit fluid leak
        • Forward clutch defective
        Pressure is low when shift lever is on R only
        • R position circuit fluid leak
        • Reverse clutch defective
        • 1st and reverse brake defective
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