Automatic Transmission System Hydraulic Test

  1. MEASURE LINE PRESSURE

Automatic Transmission System -- Hydraulic Test



MEASURE LINE PRESSURE
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.A750F Automatic Transmission.Automatic Transmission System.Automatic Transmission System Hydraulic Test
NOTICE:
  1. Perform the test at the normal operating ATF temperature: 50 to 80°C (122 to 176°F).
  2. The line pressure test should always be performed with at least 2 people. One person should observe the condition of the wheels or wheel chocks while the other is performing the test.
  3. Be careful to prevent SST's hose from interfering with the exhaust pipe.
  4. This test must be performed after checking and adjusting the engine.
  5. Perform the test with the A/C OFF.
  6. When conducting the stall test, do not continue for more than 5 seconds.

  1. Warm up the ATF.

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

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

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

  4. Start the engine and check the idling 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. Perform the measure line pressure test again with the shift lever on R.

    Specified line pressure:
    Condition
    		Shift Lever on D
    		Shift Lever on R
    Idling
    		361 to 421 kPa
    (3.7 to 4.3 kgf/cm2, 53 to 61 psi)
    		482 to 562 kPa
    (4.9 to 5.7 kgf/cm2, 70 to 81 psi)
    Stall
    		1,320 to 1,420 kPa
    (13.5 to 14.5 kgf/cm2, 191 to 206 psi)
    		1,210 to 1,329 kPa
    (12.3 to 13.6 kgf/cm2, 175 to 193 psi)

    Evaluation:
    Problem
    		Possible Cause
    Measured values at all positions are higher than specified
    1. Shift solenoid valve SLT defective
    2. Regulator valve defective
    Measured values at all positions are lower than specified
    1. Shift solenoid valve SLT defective
    2. Regulator valve defective
    3. Oil pump defective
    Pressure is low when shift lever is on D only
    1. D position circuit fluid leak
    2. C1 clutch defective
    Pressure is low when shift lever is on R only
    1. R position circuit fluid leak
    2. C3 clutch defective
    3. B4 brake defective