Chrysler 2005 Crossfire SRT6 Service Manual page 3409

AUTOMATIC - NAG1 SERVICE INFORMATION 21 - 339
ZH
SHIFT PRESSURE CONTROL SOLENOID VALVE
The shift pressure control solenoid valve (1) is located
in the shell of the electric valve control unit and is
pressed against the shift plate by a spring.
Its purpose is to control the shift pressure depending
on the continuously changing operating conditions,
such as load and gear change.
The shift pressure regulating solenoid valve (1) has an
interference fit and is sealed off to the valve body of
the shift plate (4) by a seal (arrow). The contact
springs (2) at the solenoid valve engage in a slot in
the conductor tracks (3). The force of the contact
springs (2) ensures secure contacts.
OPERATION
When an electrical current is applied to the solenoid coil, a magnetic field is created which produces an attraction
to the plunger, causing the plunger to move and work against the spring pressure and the load applied by the fluid
the valve is controlling. The plunger is normally directly attached to the valve which it is to operate. When the cur-
rent is removed from the coil, the attraction is removed and the plunger will return to its original position due to
spring pressure.
The plunger is made of a conductive material and accomplishes this movement by providing a path for the magnetic
field to flow. By keeping the air gap between the plunger and the coil to the minimum necessary to allow free move-
ment of the plunger, the magnetic field is maximized.
UPSHIFT/DOWNSHIFT SOLENOID VALVES
If a solenoid valve is actuated by the TCM, it opens and guides the control pressure (p-SV) to the assigned com-
mand valve. The solenoid valve remains actuated and therefore open until the shifting process is complete. The shift
pressure (p-SV) to the command valve is reduced to zero as soon as the power supply to the solenoid valve is
interrupted.
SHIFT PRESSURE CONTROL SOLENOID VALVE
The shift pressure regulating solenoid valve (1) assigns a proportional pressure to the current which is controlled by
the TCM according to the load.