Lexus IS250 IS220d GSE20 ALE20 - A960E AUTOMATIC TRANSMISSION
AUTOMATIC TRANSMISSION SYSTEM - HYDRAULIC TEST
| PERFORM HYDRAULIC TEST |
Measure the line pressure.
- NOTICE:
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F)
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.
Be careful to prevent SST hose from interfering with the exhaust pipe.
This Check must be conducted after checking and adjusting engine.
Perform under condition that A/C is OFF.
When conducting stall test, do not continue more than 5 seconds.
Warm up the ATF (Automatic Transmission Fluid).
Lift the vehicle up.
Remove the test plug on the transmission case center right side and connect SST.
- SST
- 09992-00095(09992-00231,09992-00271)
Lower the vehicle.
Fully apply the parking brake and chock the 4 wheels.
Start the engine and check idling speed.
Keep your left foot pressing firmly on the brake pedal and shift into D position.
Measure the line pressure when the engine is idling.
Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.
In the same manner, do the test in R position.
| 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) | 485 to 585 kPa (4.9 to 6.0 kgf/cm2, 70 to 85 psi) |
| Stall test | 1,233 to 1,343 kPa (12.6 to 13.7 kgf/cm2, 179 to 195 psi) | 1,401 to 1,609 kPa (14.3 to 16.4 kgf/cm2, 203 to 233 psi) |
| 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 |