Suzuki XL7 2007 Service Manual page 1130

3B-1 Differential:
Differential
Rear Drive Axle Description and Operation
The rear differential assembly in this vehicle consists of
an aluminum housing which contains a electric clutch/
coupler and a differential. The differential fluid is only
contained in the differential housing portion.
The clutch and clutch housing are serviced as an
assembly. The clutch housing also has no differential
clutch control module (CCM).
The differential clutch control module has integrated
active clutch control logic.
The clutch or coupling can provide torque to the rear
differential under a wide range of driving conditions. It
differs from past on-demand systems as it can preload
the clutch during take off to provide a less likelihood of
wheel slip.
The clutch control module (CCM) is connected to the
vehicle serial data stream via the control area network
(CAN).
It uses data stream information from the engine control
module (ECM) and the ABS/stability control module. The
CCM monitors such signals as individual wheel speeds,
ABS/stability control active, throttle position or wheel
torque request to determine mode of operation.
The fluid level range for proper rear differential assembly
operation is 500 ml. New service replacement units will
be shipped dry (without fluid). Fill new units with 500 ml
of GL Synthetic fluid.
All-Wheel Drive Description and Operation
This vehicle is equipped with the Rear Differential Clutch
Control Module for AWD Vehicles.
The vehicle is equipped with the following system and
operation:
• System distributes torque evenly between the 2 rear
wheels.
General Description
• The system distributes torque to the rear wheels to
enhance traction and improve vehicle handling
performance.
• The rear differential clutch control assembly contains
a main clutch, pilot clutch, electromagnetic coil, rear
wheel shaft, main cam, pilot cam.
• The clutch control module operates by utilizing a
clutch pack for transferring torque. The engagement
mechanism consists of an electromagnetic coil and
armature which modulates torque through a pilot
clutch and thrust amplification device.
• The rear differential has a micro computer which
receives information from the clutch control module
(CCM).
• The CCM has an internal temperature sensor, which
will maintain consistent and continuous temperature
compensation for torque transfer from −40°C to
+120°C. When the temperature of the module is
determined to be beyond its limits, the CCM will
temporarily disable the rear drive system and turn on
the AWD Disabled message. When the temperature
of the module is back within the limits, the CCM will
enable the rear drive system.
• If the vehicle is being driven very aggressively, and or
an unexpected tire size has been used, the AWD
disabled message will be turned on. This should not
result in the replacement of CCM module.
• The AWD disable message will be turned on if the
mini-spare tire or a very small sized tire has been
installed. This should not result in the replacement of
CCM module.
• The clutch coil receives current from the CCM which
is used to modulate torque through the use of the
engagement mechanism. The greater the current the
greater the torque. The safe current range is between
0.1-3.0-amps. If the current range is not within those
values we have DTCs that set and the Service AWD
message will appear.
• The module uses vehicle speed, steering angle,
wheel slip, thermal compensation, and chassis control
intervention to determine current. These are
messages on GMLAN from other modules.
• Replace the CCM, the CCM needs to be configured
for the clutch control calibrations. The connector on
the clutch (that plugs into the CCM) will have a 2 digit
value. Use that 2 digit value to program the CCM
using the Tech 2.
• Voltage for our module is between 5-24 volts. We set
a low voltage code but not a high voltage code as we
can withstand a voltage up to 24 volts.
• Displays 2 messages in DIC or IP. Amber AWD
Disabled (All Wheel Drive Off) - DIC Service All Wheel
Drive.