Pressure Switches (PS-A, PS-B, PS-C, PS-D, PS-E)
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The pressure switches listed here will not be applicable to all vehicle applications. Some vehicles will not have the pressure switches installed in the valve body.
Each of the five shift pressure control solenoids has corresponding pressure switch, which is normally closed. The pressure switch is designed to open when the variable force shift (VFS) solenoid control pressure exceeds the 276 kPa (40 psi) (design switch point). The current delivered through the switches is controlled by selection of a value for a pull-up resister in the powertrain control module (PCM) system.