(Asc) - BMW C 400 X Rider's Manual

take over and even the
9
BMW Motorrad ABS is unable to
counteract their effects.
134
Automatic Stability
Control (ASC)
How does ASC work?
BMW Motorrad ASC compares
the wheel speeds of the front
and rear wheels. Differences in
the relative rotation speeds al-
low the system to determine the
slip rate, and thus the stability re-
serves at the rear wheel. The en-
gine management system adapts
the engine torque when the slip
limit is exceeded.
z
Special situations
As lean angles increase, accel-
eration potential is also progres-
sively restricted by the laws of
physics. This can result in de-
layed acceleration when coming
out of very tight curves.
The system compares the rota-
tion speeds of the front and rear
wheels to detect any tendency
for the rear wheel to spin or lose
traction. If the system registers
implausible data for an extended
period of time it will deactivate
the ASC functionality as safety
precaution and a display will alert
you to an ASC error. A self-diag-
nosis routine must be completed
before the error will be displayed.
If the front wheel loses contact
to the ground during extreme
acceleration, the ASC reduces
the engine torque until the front
wheel touches the ground again.
BMW Motorrad recommends
that you respond to this condi-
tion by twisting back the throttle
grip somewhat to return to stable
dynamic operating conditions as
quickly as possible.
https://www.motorcycle-manual.com/
Never abruptly turn the throttle
grip all the way back while on a
smooth road surface. The en-
gine's braking torque could cause
the rear wheel to lock, resulting
in unstable motorcycle condi-
tions. This case cannot be con-
trolled by BMW Motorrad ASC.
Slippery roadway
On very loose surfaces (e.g. a
gravel bed at a racetrack) the
control interventions of the ASC
can reduce the drive force at
the rear wheel to such a degree
that the rear wheel no longer
turns sufficiently. In this case,
BMW Motorrad recommends
switching off the ASC temporar-
ily.
Note that the rear wheel will spin
on the loose surface, and close
the throttle in a timely manner
before reaching a solid surface.
Then switch on ASC again.