Explorer AWD V6-4.0L VIN K Flex Fuel (2003)
Pressure Regulating Solenoid: Description and Operation
Pressure Control Solenoids (PCA, PCB, PCC)
The pressure control (PC) solenoids are a variable-force style (VFS) solenoid. The VFS-type solenoid is an electro-hydraulic actuator combining a
solenoid and a regulating valve.
The line pressure tap is used to verify output pressure from PC A or PC B by turning either one off while verifying the output from the other solenoid.
The second pressure tap is used to verify the output from the PC C solenoid.
There are three PC solenoids located in the solenoid body assembly used to control line pressure, band and clutch application pressure within the
transmission.
The powertrain control module (PCM) varies the current to the PC solenoid.
The PCM has an adaptive learn strategy to electronically control the transmission which will automatically adjust the shift feel. When the battery has
been disconnected, or a new battery installed, certain transmission operating parameters may be lost. The PCM must relearn these parameters. During
this learning process you may experience slightly firm shifts, delayed, or early shifts. This operation is considered normal and will not affect the function
of the transmission. Normal operation will return once these parameters are stored by the PCM.
