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Home >> Lexus >> 2024 >> RC 350 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Automatic Transmission System (8AR-FTS,Aa81E) - Diagnostics - Introduction (1 Of 2)) >> AUTOMATIC TRANSMISSION SYSTEM (for 8AR-FTS) >> Hydraulic Test [10/2015 - 09/2020] >> Hydraulic Test [10/2015 - 09/2020]

Hydraulic Test [10/2015 - 09/2020]

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  1. PERFORM HYDRAULIC TEST 
    1. Measure the line pressure.
      GTY627330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:

      A 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 the exhaust pipe.
      • This check must be conducted after checking and confirming that the engine is normal.
      • Perform this test with the A/C off.
      • Do not perform the stall test for longer than 5 seconds.
      • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
      1. Warm up the ATF.
      2. Remove the test plug on the center of the right side of the transmission case side and connect SST.
        • SST: 09993-19016 
          1. 09993-00011
          2. 09993-00041
      3. Fully apply the parking brake and chock all 4 wheels.
      4. Start the engine and check the idle speed.
      5. Keep your left foot firmly on the brake pedal and move the shift lever to D.
      6. Measure the line pressure when the engine is idling.
      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.
      8. Measure the line pressure again with the shift lever in R.
        SPECIFIED LINE PRESSURE

        Condition D Position kPa (kgf/cm2 , psi) R Position kPa (kgf/cm2 , psi)
        Idling 310 to 430 kPa
        (3.1 to 4.4 kgf/cm2 , 45 to 62 psi)        		 310 to 430 kPa
        (3.1 to 4.4 kgf/cm2 , 45 to 62 psi)
        Stall test 1560 to 1750 kPa
        (15.9 to 17.8 kgf/cm2 , 226 to 254 psi)        		 1560 to 1750 kPa
        (15.9 to 17.8 kgf/cm2 , 226 to 254 psi)
        EVALUATION

        Problem Possible Cause
        Measured values at all positions are higher than specified
        • Solenoid (SLT) valve defective
        • Regulator valve defective
        Measured values at all positions are lower than specified
        • Solenoid (SLT) valve defective
        • Regulator valve defective
        • Oil pump defective
        Pressure is low when shift lever is in D only
        • D position circuit fluid leak
        • C1 clutch defective
        Pressure is low when shift lever is in R only
        • R position circuit fluid leak
        • C4 clutch defective
        • B2 brake defective
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