Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2006-07 Mechanism and Function 6MT Manual Trans
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MANUAL TRANSMISSION
AND DIFFERENTIAL
(6MT)
DRIVER'S CONTROL CENTER DIFFERENTIAL SYSTEM (FROM '06MY)
MANUAL TRANSMISSION AND DIFFERENTIAL
1. Driver's Control Center Differential System (From '06MY)
A: GENERAL
The Driver's Control Center Differential (DCCD) system consists of the sensors and switches such
as steering angle sensor, yaw rate and lateral G sensor, or stop light switch, the planetary gear type
center differential (with built-in the LSD clutch), and the DCCD control module.
The center differential of single pinion gear type planetary unit distributes the engine torque to the
front wheels and rear wheels at the torque ratio of 41:59.
(2) (2) (3) (5)
(1)
(1)
(7)
(4) (3)
(6) (4)
MT-01509
(1) Carrier (5) Transfer drive gear
(2) Pinion gears (6) Drive pinion shaft
(3) Sun gear (7) Driven shaft
(4) Internal gear
6MT-2
DRIVER'S CONTROL CENTER DIFFERENTIAL SYSTEM (FROM '06MY)
MANUAL TRANSMISSION AND DIFFERENTIAL
The controllability of the vehicle with accelerator operation has been improved more, because the
timing of the differential restriction of LSD and the acceleration of the vehicle synchronizes almost
completely by combining the torque sensing type mechanical LSD mechanism with the convention-
al electromagnetic clutch LSD mechanism.
(2)
(1) (3)
(4)
(9) (5)
(8) (6)
(7)
MT-01433
(1) Torque cam (5) Pilot clutch hub
(2) Intermediate clutch pressure (6) Pilot clutch
plate
(7) Intermediate clutch
(3) Armature (8) Main clutch
(4) Coil (9) Main clutch hub
With the yaw rate and lateral G sensor and the newly adopted steering angle sensor, the traveling
line which the driver aims at is detected, and the differential restriction force in response to the be-
havior of the vehicle is adjusted. This makes it possible to reduce the understeer or oversteer ten-
dency, and to actualize vehicle behavior that the driver intends it to be.
In manual mode, the engagement power of electromagnetic clutch LSD can be adjusted with the
DCCD control dial within the range of free to lock. However, even when the engagement power of
electromagnetic clutch LSD is in the free condition, the differential restriction with mechanical LSD
is done.
When a malfunction occurs in the system, the fail-safe control may be performed that releases
the electromagnetic clutch LSD so as to maintain safe conditions. At this time, the Subaru Select
Monitor can be used for the system diagnosis.
6MT-3
DRIVER'S CONTROL CENTER DIFFERENTIAL SYSTEM (FROM '06MY)
MANUAL TRANSMISSION AND DIFFERENTIAL
B: OPERATION
The DCCD system has the following 2 modes: "MANUAL MODE" and "AUTO MODE". In MANUAL
MODE, as the operation amount of DCCD control dial (driver's will) is prioritized, the control that
increases/decreases the engagement power of electromagnetic clutch LSD is performed. In AUTO
MODE, the control that automatically adjusts the engagement power of electromagnetic clutch LSD
corresponding to the input signals of steering angle sensor or yaw rate and lateral G sensor is per-
formed.
Control of DCCD control module
Center differential input torque Increases or decreases the engagement power of electromagnetic clutch LSD correspond-
sensing engagement power ing to the center differential input torque.
ABS operation signal input Decreases the engagement power of electromagnetic clutch LSD when the ABS operation
signal is input from ABSCM&H/U to DCCD CM.
Brake switch signal input Decreases the engagement power of electromagnetic clutch LSD when the brake switch sig-
nal is input to DCCD CM.
Parking brake signal input Releases the electromagnetic clutch LSD when the parking brake signal to DCCD CM is in-
put.
Tight cornering Decreases the engagement power of electromagnetic clutch LSD by judging the vehicle con-
dition from the steering angle sensor signal so as to prevent the tight cornering symptom.
Slip Calculates the slip amount of each wheel based on the wheel sensor signal, and then cor-
rects the engagement power of electromagnetic clutch LSD corresponding to the slip amount
of wheel.
Cornering Optimally controls the engagement power of electromagnetic clutch LSD by judging the ve-
hicle cornering condition based on the signals of the steering angle sensor and the yaw rate
and lateral G sensor so as to manage both drivability and stability of the vehicle during cor-
nering.
DCCD control dial Decreases or increases the engagement power of electromagnetic clutch LSD with the op-
eration amount of the DCCD control dial of the driver.
Fail-safe DCCD CM indicates the malfunction to the driver by blinking the light on the bottom of DCCD
indicator when some malfunctions of system have been detected.
When there is a serious malfunction in the DCCD coil, DCCD CM turns the DCCD coil OFF
and releases the electromagnetic clutch LSD completely. If the malfunction is not a serious
malfunction, such as the malfunctions of some sensors, DCCD CM performs the control that
maintains the system operation as much as possible.
Rear differential oil temperature When the rear differential oil temperature rises excessively [approximately 150◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo