Evaluation of line pressure test
WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
EVALUATION OF LINE PRESSURE TEST
| Condition | Possible cause | ||
|---|---|---|---|
| Idle | Below specification | Low pressure in all ranges | Worn oil pump Poor operation of each solenoid Fluid leaking from oil strainer, oil pump, pressure regulator valve, torque converter relief valve, and/or pressure relief valve Pressure regulator valve or pilot valve sticking Damaged pressure regulator valve spring or pilot valve spring |
| Low pressure in D range only | Fluid leaking from hydraulic circuit of low clutch | ||
| Low pressure in 3 and 2 ranges only | Fluid leaking from hydraulic circuit of low clutch and 2-4 brake | ||
| Low pressure in R position only | Fluid leaking from hydraulic circuit of reverse clutch Fluid leaking from hydraulic circuit of low and reverse brake clutch |
||
| Above specification | High pressure in all ranges | Throttle position sensor out of adjustment TFT sensor malfunction Poor operation of shift solenoid Pilot valve sticking Pressure reducing valve or plug sticking |
|
| Stall | Below specification | Low pressure in all ranges | Throttle position sensor out of adjustment Pressure control solenoid malfunction Poor operation of shift solenoid Pilot valve sticking Pressure reducing valve or plug sticking |