Pressure Test Results (F4A20 Series)
- If kickdown brake, front clutch, end clutch and low-reverse brake pressures are all low probable causes are: clogged oil filter, incorrect pressure regulator adjustment, sticking pressure regulator valve, incorrect oil pump discharge pressure or fluid pressure leakage at valve body.
- Incorrect reducing pressure reading indicates: incorrect line pressure, reducing pressure filter clogging, reducing valve sticking or fluid pressure leakage at valve body.
- Incorrect kickdown brake pressure reading indicates: fluid pressure leakage at kickdown servo or valve body malfunction.
- Incorrect front clutch pressure reading indicates fluid pressure leakage at kickdown servo or valve body, malfunction of valve body or fluid pressure leakage at front clutch piston or retainer.
- Incorrect end clutch pressure reading indicates: fluid leakage at end clutch piston, fluid pressure leakage at valve body or valve body malfunction.
- Incorrect low-reverse brake pressure reading indicates: fluid pressure leakage between valve body and transaxle case at "O" ring, valve body malfunction or fluid pressure leakage at low-reverse brake piston or retainer.
- Incorrect torque converter pressure indicates: clogging or leaking of oil cooler or lines, torque converter failure, leaking seal ring at input shaft or binding Damper Clutch Control Solenoid Valve (DCCSV) or damper control valve.