EPC Solenoid
Record line pressure. Line pressure should go to maximum pressure. If line pressure is not within specification, see TESTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article or PINPOINT TEST E. Depress EPC switch. Line pressure should drop to minimum pressure. If line pressure is not within specification, see TESTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article or PINPOINT TEST E.