Dodge Sprinter. Manual — part 284
relation to the load and gear. All other pressures
required for the transmission control are derived
from the working pressure.
Lubrication Pressure (p - Sm)
At the working pressure regulating valve surplus
oil is diverted to the lubrication pressure regulating
valve, from where it is used in regulated amounts to
lubricate and cool the mechanical transmission com-
ponents and the torque converter. Furthermore, the
lubrication pressure (p-Sm) is also used to limit the
pressure in the torque converter.
Shift Pressure (p - S)
The shift pressure is determined by the shift pres-
sure regulating solenoid valve and the shift pressure
regulating valve. The shift pressure:
• Regulates the pressure in the activating shift
element during the shift phase.
• Determines together with the modulating pres-
sure the pressure reduction at the deactivating shift
element as regulated by the overlap regulating valve.
• Initializes 2nd gear in limp-home mode.
Modulating Pressure (p - Mod)
The modulating pressure influences the size of the
working pressure and determines together with the
shift pressure the pressure regulated at the overlap
regulating valve. The modulating pressure is regu-
lated at the modulating pressure regulating solenoid
valve, which is under regulating valve pressure. The
modulating pressure is variable and relative to the
engine load.
Regulating Valve / Control Valve Pressure (p - RV)
The regulating valve pressure is regulated at the
regulating valve pressure regulating valve in relation
to the working pressure (p-A) up to a maximum pres-
sure of 8 bar (116 psi). It supplies the modulating
pressure regulating solenoid valve, the shift pressure
regulating solenoid valve and the shift valve pressure
regulating valve.
Shift Valve Pressure (p - SV)
The shift valve pressure (p-SV) is derived from the
regulating valve pressure (p-RV), is regulated at the
shift valve pressure regulating valve and is then
present at the:
• 1-2 and 4-5 shift solenoid valve.
• 3-4 shift solenoid valve.
• 2-3 shift solenoid valve.
• Torque converter lockup solenoid valve.
• 3-4 and 2-3 shift pressure shift valve.
The shift valve pressure (p-SV) controls the com-
mand
valves
via
the
upshift/downshift
solenoid
valves.
Overlap Pressure (p - Ü)
The overlap pressure controls the shift component
pressure reduction during a shift phase. The pres-
sure in a shift element as it disengages is controlled
during the shift phase depending on engine load
(modulating pressure) and the pressure in the shift
element as it engages. The adjusted pressure is
inversely proportional to the transmission capability
of the shift element being engaged (controlled over-
lap).
Working Pressure Regulating Valve (Operating Pressure)
The working pressure regulating valve (4) (Fig.
101) is located in the valve housing of the shift plate.
It regulates the primary pressure of the hydraulic
system.
Fig. 101 Working Pressure Regulating Valve
1 - PRESSURE FROM K1/K2
2 - END FACE
3 - TO TORQUE CONVERTER REGULATING VALVE
4 - WORKING PRESSURE REGULATING VALVE
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Torque Converter Lockup Clutch Regulating Valve
The torque converter lock-up clutch regulating
valve (6) (Fig. 102) is located in the valve housing of
the electrohydraulic control module. The valve is
responsible for the hydraulic control of the torque
converter lockup clutch and distribution of the lubri-
cating oil.
Fig. 102 Torque Converter Lockup Clutch Regulating Valve
1 - TORQUE CONVERTER LOCK-UP CLUTCH
2 - TORQUE CONVERTER OUTPUT
3 - TORQUE CONVERTER INPUT
4 - LUBRICATION
5 - TORQUE CONVERTER LOCK-UP SOLENOID
6 - TORQUE CONVERTER LOCK-UP CLUTCH REGULATING
VALVE
7 - OIL COOLER
8 - LINE PRESSURE REGULATING VALVE
9 - OIL PUMP
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Overlap Regulating Valve
Each shift group is assigned one overlap regulating
valve (1) (Fig. 103). The 1-2 / 4-5 overlap regulating
valve is installed in the shift valve housing; the 2-3
and 3-4 overlap regulating valves are installed in the
valve housing. The overlap regulating valve regulates
the pressure reduction during a shift phase.
Fig. 103 Overlap Regulating Valve
1 - OVERLAP REGULATING VALVE
2 - ANNULAR SURFACE ON OVERLAP REGULATING VALVE
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Command Valve
Each shift group possesses one command valve (3)
(Fig. 104). The 1-2 / 4-5 and 2-3 command valves are
installed in the shift valve housing, the 3-4 command
valve is installed in the valve housing. The command
valve switches the shift group from the stationary
phase to the shift phase and back again.
Fig. 104 Command Valve
1 - HOLDING CLUTCH B1
2 - DRIVING CLUTCH K1
3 - 1-2/4-5 COMMAND VALVE
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