Shift Solenoid Pressure Control Solenoids (SSPC-A, SSPC-B, SSPC-C, SSPC-D, SSPC-E)
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The intermediate (SSPC-C), low/reverse (SSPC-E) and overdrive (SSPC-B) clutches are each controlled by a directly proportional variable force shift (VFS) solenoid. The coast (SSPC-A) and the direct clutch (SSPC-D) are each controlled by an inversely proportional VFS. All shift pressure solenoids are electronically controlled by the PCM which varies the current from 0 to 1 amp (direct proportional) or 1 to 0 amp (indirectly proportional).