| I seem
to get a lot of ABS faults when starting my bike and riding
away. How do I prevent this from happening?
fault on startup can occur when the system does not have
enough energy - a fault is indicated by ALTERNATING flashing.
Synchronized flashing of the two lights is normal and will
stop as you drive away - you will hear the system make a
"kerchunk" sound and the lights will go out. The
lights will not go out until you ride a few feet and initialize
are getting ABS faults, then you are going through your
start-up procedure too quickly. When you start your bike,
give the total system more time to initialize. The ABS system,
fuel pump and Motronic all need a lot of juice. A good rule
of thumb is to turn on the key, let the ABS lights blink
at least three times before hitting the starter button.
If you slow down your startup procedure in this manner,
your faults will cease. If not, then you have a poor battery
or other electrical system problems. See your mechanic.
B. Pantangco <email@example.com
> agrees but points out that the problem could be related
to the starter: "For RT owners who experience intermittent
problems with their ABS when starting their bikes (either
cold or warm), the source of the problem is low voltage, approximately
lower than 9.8 volts (BMW internet riders 1100 faq file).
This can occur from a battery that has not been charged from
use or thru a battery tender; or, as what happened to me,
the starter motor was draining more current than expected.
A simple test would be to connect a voltmeter to the battery
terminals. If during starting, the voltage drops below 9.8
volts, check battery condition. If battery is fully charged
prior to starting, check the voltage and current drain of
the starter (per BMW repair manual page12.11), the voltage
should be 10-11 v and current drain (measured from + side)
should be between 80-150 A. If the current drain is more,
have the starting motor checked. It is easy to locate (bottom
left hand side after removing the side panel) and detach since
there are only two allen screws. Disassembly is easy if you
are an experienced mechanic. There may be a loose magnet(s)
attached to the rotor. If so, an experienced mechanic could
reattach the magnet(s) and secure the rest.