Line Pressure Diagnosis Chart

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

LINE PRESSURE DIAGNOSIS

Test Results	Possible Source
High at Idle - All Ranges	Wiring Harnesses PC C Boost Valve PC C Solenoid Main Regulator Valve
Low at Idle - All Ranges	Low Fluid Level Fluid Inlet Filter/Seal Main Control Body Cross Leaks Gaskets Pump Separator Plate
Low - All Forward Ranges	Forward Clutch Main Control Overdrive Servo Intermediate Servo
Low in Park Only	Valve Body
Low in Reverse Only	Separator Plate Rear Servo Piston, Cover Seal Reverse Clutch Overdrive Servo Intermediate Servo Valve Body Forward Clutch
Low in Neutral Only	Valve Body Overdrive Servo Intermediate Servo
Low in D5 Only	Forward Clutch Overdrive Servo Intermediate Servo Valve Body
Low in D4 Only (O/D Cancelled)	Forward Clutch Overdrive Servo Intermediate Servo Valve Body
Low in First Position	Forward Clutch Valve Body
Low in Second Position	Intermediate Servo Overdrive Servo Intermediate Servo Forward Clutch
Low in Third Position	Intermediate servo Overdrive servo Forward clutch