AUTOMATIC TRANSMISSION SYSTEM HYDRAULIC TEST


  1. PERFORM HYDRAULIC TEST


    1. Measure the line pressure.

      CAUTION:

      The line pressure test should always be carried out in pairs. One technician should observe the conditions of the wheels and wheel chocks outside the vehicle while the other is performing the test.

      Note


      • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).

      • Be careful to prevent SST hose from interfering with the exhaust pipe.

      • This check must be conducted after checking and adjusting the engine.

      • Perform the test with the air conditioning off.

      • When conducting the stall test, do not continue for more than 5 seconds.

      • When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.


      1. Warm up the ATF (Automatic Transmission Fluid).

      2. Turn the engine switch off.

      3. Lift the vehicle up.

      4. A01WPWOE01
        *1 Test Plug

        Remove the test plug on the transmission case and connect SST.

        SST
        09993-19015   ( 09993-00040, 09993-00010 )

      5. Lower the vehicle.

      6. Fully apply the parking brake and chock the 4 wheels.

      7. Start the engine and check the idling speed.

      8. Keep your left foot pressed firmly on the brake pedal and move the shift lever to D.

      9. Fully depress the accelerator pedal with your right foot. Quickly read the highest line pressure when the engine speed reaches the stall speed.

      10. In the same manner, perform the test with the shift lever in R.

        Specified Line Pressure
        Condition D Position R Position
        Stall speed

        1230 to 1390 kPa

        (12.5 to 14.2 kgf/cm2, 178 to 202 psi)

        1470 to 1690 kPa

        (15.0 to 17.2 kgf/cm2, 213 to 245 psi)
        Evaluation
        Problem Possible Cause
        Measured values at D and R positions are higher than specified pressure

        • Shift solenoid valve SLT defective

        • Regulator valve defective
        Measured values at D and R positions are lower than specified pressure

        • Shift solenoid valve SLT defective

        • Regulator valve defective

        • Oil pump defective
        Pressure is low in D position only

        • D position circuit fluid leak

        • Clutch No. 1 (C1) defective
        Pressure is low in R position only

        • R position circuit fluid leak

        • Clutch No. 3 (C3) defective

        • Brake No. 4 (B4) defective