2006 MERCEDES-BENZ SPRINTER Service Manual

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Page 1913 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual (4) Disconnect the park lock cable coupling (1)
(Fig. 224) from the shift lever assembly (SLA). Press
locking tab (2) together and push coupling (1) against
the spring force into the SLA, twist throug

Page 1914 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual (5) Turn on ignition and apply brakes. Move selec-
tor lever back to position ªDº.
(6) Install the transmission shift cable onto the
ball knob at the SLA.
(7) Install the bottom (2) (Fig. 227) of th

Page 1915 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual directly, which means that the solenoids must have
very high outputs to close the valves against the siz-
able flow areas and line pressures found in current
transmissions. Fast response time is also

directly, which means that the solenoids must have
very high outputs to close the valves against the siz-
able flow areas and line pressures found in current
transmissions. Fast response time is also necessary
to ensure accurate control of the transmission.
The strength of the magnetic field is the primary
force that determines the speed of operation in a par-
ticular solenoid design. A stronger magnetic field will
cause the plunger to move at a greater speed than a
weaker one. There are basically two ways to increase
the force of the magnetic field:
1. Increase the amount of current applied to the
coil or
2. Increase the number of turns of wire in the coil.
The most common practice is to increase the num-
ber of turns by using thin wire that can completely
fill the available space within the solenoid housing.
The strength of the spring and the length of the
plunger also contribute to the response speed possi-
ble by a particular solenoid design.
A solenoid can also be described by the method by
which it is controlled. Some of the possibilities
include variable force, pulse-width modulated, con-
stant ON, or duty cycle. The variable force and pulse-
width modulated versions utilize similar methods to
control the current flow through the solenoid to posi-
tion the solenoid plunger at a desired position some-
where between full ON and full OFF. The constant
ON and duty cycled versions control the voltage
across the solenoid to allow either full flow or no flow
through the solenoid's valve.UPSHIFT / DOWNSHIFT SOLENOID VALVES
The solenoid valves (1) for upshifts and downshifts
(Fig. 229) are located in the shell of the electric con-
trol unit and pressed against the shift plate with a
spring.
The solenoid valves (1) initiate the upshift and
downshift procedures in the shift plate.
The solenoid valves (1) are sealed off from the
valve housing of the shift plate (5) by two O-rings (4,
6). The contact springs (8) at the solenoid valve
engage in a slot in the conductor tracks (7). The force
of the contact spring (8) ensures safe contacts.
Fig. 229 Upshift/Downshift Solenoid Valves
1 - UPSHIFT/DOWNSHIFT SOLENOID VALVE
2 - CONTACT SPRING
3 - CONDUCTOR TRACK
4 - O-RING
5 - VALVE HOUSING OF SHIFT PLATE
6 - O-RING
7 - CONDUCTOR TRACK
8 - CONTACT SPRING
21 - 172 AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATIONVA

Page 1916 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual MODULATING PRESSURE CONTROL SOLENOID
VALVE
The modulating pressure control solenoid valve (1)
(Fig. 230) is located in the shell of the electric valve
control unit and pressed against the shift plate

Page 1917 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual SHIFT PRESSURE CONTROL SOLENOID VALVE
The shift pressure control solenoid valve (1) (Fig.
232) is located in the shell of the electric valve con-
trol unit and pressed against the shift plate by a
spr

SHIFT PRESSURE CONTROL SOLENOID VALVE
The shift pressure control solenoid valve (1) (Fig.
232) is located in the shell of the electric valve con-
trol unit and pressed against the shift plate by a
spring.
Its purpose is to control the shift pressure depend-
ing on the continuously changing operating condi-
tions, 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 sole-
noid 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 current 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 forthe magnetic field to flow. By keeping the air gap
between the plunger and the coil to the minimum
necessary to allow free movement of the plunger, the
magnetic field is maximized.
UPSHIFT / DOWNSHIFT SOLENOID VALVES
If a solenoid valve (1) (Fig. 233) is actuated by the
TCM, it opens and guides the control pressure (p-SV)
to the assigned command valve. The solenoid valve
remains actuated and therefore open until the shift-
ing 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.
Fig. 232 Shift Pressure Control Solenoid Valve
1 - SHIFT PRESSURE CONTROL SOLENOID VALVE
2 - CONTACT SPRING
3 - CONDUCTOR TRACK
4 - VALVE HOUSING SHIFT PLATE
5 - CONDUCTOR TRACK
6 - CONTACT SPRING
Fig. 233 Upshift/Downshift Solenoid Valves
1 - UPSHIFT/DOWNSHIFT SOLENOID VALVE
2 - CONTACT SPRING
3 - CONDUCTOR TRACK
4 - O-RING
5 - VALVE HOUSING OF SHIFT PLATE
6 - O-RING
7 - CONDUCTOR TRACK
8 - CONTACT SPRING
21 - 174 AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATIONVA

Page 1918 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual MODULATING PRESSURE CONTROL SOLENOID
VALVE
The modulating pressure regulating solenoid valve
(1) (Fig. 234) assigns a proportional pressure to the
current which is controlled by the TCM according to
t

Page 1919 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual SHIFT PRESSURE CONTROL SOLENOID VALVE
The shift pressure regulating solenoid valve (1)
(Fig. 236) assigns a proportional pressure to the cur-
rent which is controlled by the TCM according to the
load.

Page 1920 of 2305

MERCEDES-BENZ SPRINTER 2006 Service Manual The transmission oil temperature sensor (1) (Fig.
238) is located in the shell of the electric valve con-
trol unit and is fixed to the conductor tracks.
Its purpose is to measure the temperature of t

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