Transmission Solenoid Body Assembly

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.

The powertrain control module (PCM) controls the transmission operation through:

seven variable force solenoids (VFS).
five pressure switches (if equipped).
a transmission fluid temperature (TFT) sensor.
a manual valve.
an over-pressurization relief valve.

All the above components are located on the solenoid body.

There is a solenoid and a pressure switch dedicated to the function of each clutch. Line pressure and the torque converter clutch each have their own solenoid. Four solenoids are directly proportional; the pressure output is directly proportional to the applied DC amps. Three solenoids are inversely proportional; the pressure output is inversely proportional to the applied DC current.

Solenoids are keyed to prevent misassembly. The tan wire connectors connect to the solenoids. The black connectors connect to the pressure switches. There are separate connectors for the TFT sensor and for the transmission range (TR-P) sensor. The 24-pin bulkhead connector completes the serviceable harness assembly and has serviceable O-ring seals. The 24-pin connector uses gold plated pins.

All the solenoids except the line pressure solenoid can be serviced without removing the solenoid assembly from the transmission case. The solenoid assembly, which holds the switches and solenoids, is aligned to the transmission case with permanent dowel pins. There is a filter-type gasket between the solenoid assembly and the transmission case.