Chrysler 2005 Crossfire SRT6 Service Manual page 3352

21 - 282 AUTOMATIC - NAG1 SERVICE INFORMATION
ELECTRICAL CONTROL UNIT
The electrical control unit (7) consists of a plastic shell
which houses the RPM sensors (1,12), regulating
solenoid valves (3, 4), solenoid valves (5, 6, 10), the
TCC solenoid valve (11), the park/neutral contact (9),
and the transmission oil temperature sensor (8). Con-
ductor tracks integrated into the shell connect the
electric components to a plug connection (2). This
13-pin plug connection (2) establishes the connection
to the vehicle-side cable harness and to the transmis-
sion control module (TCM). With the exception of the
solenoid valves, all other electric components are
fixed to the conductor tracks.
HYDRAULIC CONTROL UNIT
Working Pressure (Operating Pressure) (p-A)
The working pressure provides the pressure supply to the hydraulic control and the transmission shift elements. It is
the highest hydraulic pressure in the entire hydraulic system. The working pressure is regulated at the working pres-
sure regulating valve in 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 components 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 pressure 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 pressure, 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 pres-
sure, the pressure regulated at the overlap regulating valve. The modulating pressure is regulated 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 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 pressure 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.
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