AUTOMATIC TRANSMISSION SYSTEM HYDRAULIC TEST


  1. PERFORM HYDRAULIC TEST


    1. Measure the line pressure.

      Note


      • Perform this test with the ATF (Automatic Transmission Fluid) at the normal operating 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 careful to prevent SST hose from contacting with the exhaust pipe.

      • This Check must be conducted after checking and adjusting engine.

      • Perform this test with the A/C off.

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

      • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.


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

      2. Lift the vehicle up.

      3. Remove the test plug on the center of the right side transmission case and connect SST.

        A01MUHTE01
        SST
        09992-00095   ( 09992-00231, 09992-00271 )

      4. Lower the vehicle.

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

      6. Start the engine and check idling speed.

      7. Keep your left foot pressing firmly on the brake pedal and shift into D position.

      8. Measure the line pressure when the engine is idling.

      9. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.

      10. In the same manner, do the test in R position.

        Specified Line Pressure:
        Condition

        D position kPa (kgf/cm2, psi)

        R position kPa (kgf/cm2, psi)
        Idling

        350 to 450 kPa

        (3.6 to 4.6 kgf/cm2, 51 to 65 psi)

        450 to 600 kPa

        (4.6 to 6.1 kgf/cm2, 65 to 87 psi)
        Stall test

        1200 to 1350 kPa

        (12.2 to 13.8 kgf/cm2, 174 to 196 psi)

        1600 to 1850 kPa

        (16.3 to 18.9 kgf/cm2, 232 to 268 psi)
        Evaluation:
        Problem Possible cause
        If the measured values at all position are higher

        • Shift solenoid valve (SLT) defective

        • Regulator valve defective
        If the measured values at all position are lower

        • Shift solenoid valve (SLT) defective

        • Regulator valve defective

        • Oil pump defective
        If pressure is low in the D position only

        • D position circuit fluid leak

        • Clutch No. 1 (C1) defective
        If pressure is low in the R position only

        • R position circuit fluid leak

        • Clutch No. 3 (C3) defective

        • Brake No. 4 (B4) defective