Automatic Transaxle System Hydraulic Test

Drivetrain. Corolla. Zre142 Aze141
U341E Automatic Transmission Transaxle. Corolla. Zre142 Aze141

  1. PERFORM HYDRAULIC TEST

Automatic Transaxle System -- Hydraulic Test



PERFORM HYDRAULIC TEST


    Corolla. Zre142 Aze141.U341E Automatic Transmission Transaxle.Automatic Transaxle System.Automatic Transaxle System Hydraulic Test

  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.

    2. Remove the test plug on the front left side of the transaxle case and connect SST.

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

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

    4. Connect the Techstream to the DLC3.

    5. Start the engine and check idling speed.

    6. Keep your left foot pressing firmly on the brake pedal and shift into D position.

    7. Measure the line pressure when the engine is idling.

    8. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.

    9. In the same way, do the test in R position.

      Specified line pressure:
      Condition
      		D position kPa (kgf/cm2, psi)
      		R position kPa (kgf/cm2, psi)
      Idling
      		372 to 412 kPa
      (3.8 to 4.2 kgf/cm2, 54 to 60 psi)
      		553 to 623 kPa
      (5.6 to 6.4 kgf/cm2, 80 to 100 psi)
      Stall test
      		1120 to 1230 kPa
      (11.4 to 12.5 kgf/cm2, 162 to 178 psi)
      		1660 to 1870 kPa
      (16.9 to 19.1 kgf/cm2, 241 to 271 psi)

      Evaluation:
      Problem
      		Possible cause
      If the measured values at all positions are higher
      1. Shift solenoid valve SLT defective
      2. Regulator valve detective
      If the measured values at all positions are lower
      1. Shift solenoid valve SLT defective
      2. Regulator valve detective
      3. Oil pump defective
      If pressure is low in the D position only
      1. D position circuit fluid leak
      2. Forward clutch defective
      If pressure is low in the R position only
      1. R position circuit fluid leak
      2. Reverse clutch defective
      3. 1st and reverse brake defective