Evaluation of line pressure test

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

EVALUATION OF LINE PRESSURE TEST

Condition	Possible cause
Low pressure in all positions/ranges	Worn oil pump Oil leaking from oil pump, control valve body, and/or transaxle case Pressure regulator valve stuck Pressure control solenoid malfunction Solenoid reducing valve stuck
Low pressure in D, M (1GR, 2GR) only	Oil leaking from forward clutch hydraulic circuit
Low pressure in M (2GR) only	Oil leaking from 2-4 brake band hydraulic circuit
Low pressure in M (1GR), R only	Oil leaking from low and reverse brake hydraulic circuit
Low pressure in R only	Oil leaking from reverse clutch hydraulic circuit
Higher pressure in all positions/ranges	Pressure control solenoid malfunction and/or open harness Pressure regulator valve stuck TCM malfunction