AUTOMATIC TRANSMISSION SYSTEM HYDRAULIC TEST


  1. PERFORM HYDRAULIC TEST


    1. Measure the line pressure.

      CAUTION:

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

      Note


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

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

      • This check must be conducted after checking and confirming that the engine is normal.

      • Perform this test with the air conditioning and headlights off.

      • Do not perform the stall test for longer 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.

      2. Turn the engine switch off.

      3. A01XAVOE04
        Text in Illustration
        *1 Test Plug A

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

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

        Tech Tips

        There is a difference in installation point between D position and R position.

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

      5. Start the engine and check the idle speed.

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

      7. Depress the accelerator pedal as much as possible with your right foot. Quickly read the highest line pressure reading when the engine speed reaches stall speed.

        Specified Line Pressure
        Condition

        D Position kPa (kgf/cm2, psi)
        Stall test

        1770 to 2020 kPa

        (18.1 to 20.5 kgf/cm2, 257 to 292 psi)

      8. Turn the engine switch off.

      9. Remove SST and install test plug A.

      10. A01XAX3E04
        Text in Illustration
        *1 Test Plug B

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

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

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

      12. Start the engine and check the idle speed.

      13. Keep your left foot firmly on the brake pedal and move the shift lever to R.

      14. Depress the accelerator pedal as much as possible with your right foot. Quickly read the highest line pressure reading when the engine speed reaches stall speed.

        Specified Line Pressure
        Condition

        R Position kPa (kgf/cm2, psi)
        Stall test

        1770 to 2020 kPa

        (18.1 to 20.5 kgf/cm2, 257 to 292 psi)
        Evaluation
        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
        Pressure is low when shift lever is in D only

        • D position circuit fluid leak

        • Forward multiple clutch (C1) defective
        Pressure is low when shift lever is in R only

        • R position circuit fluid leak

        • No. 3 clutch (C3) defective

        • No. 2 brake (B2) defective