AUTOMATIC TRANSMISSION SYSTEM HYDRAULIC TEST

  1. PERFORM HYDRAULIC TEST

    1. Measure the line pressure.

      CAUTION:

      The line pressure test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

      Note:

      • Perform the test while the ATF (Automatic Transmission Fluid) temperature is between 50 and 80°C (122 and 176°F).

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

      • This check must be conducted 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 5 seconds.

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

      2. Turn the engine switch off.

      3. Lift the vehicle up.

      4. C218462E03

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

        09992-00095

        09992-00231

        09992-00271

      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. Measure the line pressure when the engine is idling.

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

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

        Table 1. Specified Line Pressure

        Condition

        D Position

        R Position

        Stall speed

        1350 to 1550 kPa

        (13.8 to 15.8 kgf/cm2, 196 to 225 psi)

        1250 to 1550 kPa

        (12.7 to 15.8 kgf/cm2, 181 to 225 psi)
        Table 2. Evaluation

        Problem

        Possible Cause

        Measured values at both positions are higher than specified pressure

        • Shift solenoid valve SLT defective

        • Regulator valve defective

        Measured values at both positions are below specified pressure

        • Shift solenoid valve SLT defective

        • Regulator valve defective

        • Oil pump defective

        Pressure is low in D only

        • D position circuit fluid leak

        • Clutch No. 1 (C1) defective

        Pressure is low in R only

        • R position circuit fluid leak

        • Clutch No. 3 (C3) defective

        • Brake No. 4 (B4) defective