Hydraulic Pressure Test
- Install tachometer. Warm engine to normal operating temperature. Ensure transaxle fluid level is correct. Apply parking brake. Block rear wheels. Raise and support vehicle so front wheels can rotate.
- Reducing pressure, kickdown brake pressure, front clutch, rear clutch, end clutch, low-reverse brake and torque converter pressure are checked at specified pressure taps on transaxle. See Fig 1 .
- Remove pressure tap plug. Install pressure gauge at appropriate pressure tap. Start and operate engine at specified RPM with shift lever in position for pressure being tested. See Fig 2 . Pressure should be within specification.
- If pressure is not within specification, refer to the HYDRAULIC PRESSURE TEST TROUBLE SHOOTING table. If kickdown brake pressure or any clutch pressure is less than specified, line pressure adjustment may be required. Refer to LINE PRESSURE ADJUSTMENT under ON-VEHICLE SERVICE.
- If reducing pressure is not within specification, reducing pressure adjustment may be required. See REDUCING PRESSURE ADJUSTMENT under ON-VEHICLE SERVICE.
- Shut engine off. Remove pressure gauge. Install and tighten pressure tap plug to specification. See TORQUE SPECIFICATIONS .
HYDRAULIC PRESSURE TEST TROUBLE SHOOTING
| Application | Probable Cause |
|---|---|
| All Pressures Are Low Or High | Restricted Main Oil Filter On Valve Body, Improper Line Pressure Adjustment, Sticking Regulator Valve In Valve Body, Loose Valve Body Bolts, Defective Oil Pump |
| Improper Reducing Pressure | Improper Line Pressure Adjustment, Restricted "L" Shaped Oil Filter On Intermediate Plate In Valve Body, Improper Reducing Pressure Adjustment, Sticking Reducing Valve In Valve Body, Loose Valve Body Bolts |
| Improper Kickdown Brake Pressure | Defective "D" Rings Or Seal Rings On Kickdown Servo Piston Or Sleeve, Loose Valve Body Bolts, Defective Valve Body |
| Improper Front Clutch Pressure | Defective "D" Rings Or Seal Rings On Kickdown Servo Piston Or Sleeve, Loose Valve Body Bolts, Defective Valve Body, Defective Front Clutch Components |
| Improper End Clutch Pressure | Defective "D" Rings Or Seal Rings On End Clutch, Loose Valve Body Bolts, Defective Valve Body |
| Improper Low-Reverse Brake Pressure | "O" Ring Between Valve Body & Transaxle Housing Is Missing, Loose Valve Body Bolts, Defective Valve Body, Defective "O" Rings On Low-Reverse Brake Piston |
| Improper Torque Converter Pressure | Sticking Damper Clutch Control Solenoid Valve, Restricted Or Leaking Oil Cooler, Defective Seal Rings On Input Shaft, Defective Torque Converter |