ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM > HYDRAULIC TEST

for Preparation Click here

1. Measure the line pressure.
   

   NOTICE:

   1. Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F)
      
   2. 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.
      
   3. Be careful to prevent SST hose from interfering with the exhaust pipe.
      
   4. This Check must be conducted after checking and adjusting engine.
      
   5. Perform under condition that A/C is OFF.
      
   6. When conducting stall test, do not continue more than 5 seconds.
      
   
   

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

   2. Lift the vehicle up.
      

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

      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	355 to 425 kPa (3.6 to 4.3 kgf/cm2, 51 to 62 psi)	608 to 708 kPa (6.2 to 7.2 kgf/cm2, 88 to 103 psi)
       Stall test	1,213 to 1,323 kPa (12.4 to 13.5 kgf/cm2, 176 to 192 psi)	1,340 to 1,548 kPa (13.7 to 15.8 kgf/cm2, 194 to 225 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