BMW 1999-2005 M3 Service Manual page 1233

On-Board Diagnostics
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installed.
Professional diagnostic scan tools
available at the time of this
printing include the BMW factory
tools (DISplus and MoDiC) and a
small number of aftermarket
BMW-specific tools. The CS2000
from Baum Tools Unlimited, the
Retriever from Assenmacher
Specialty Tools, and the MT2500
from Snap-On Tools are examples
of quality OBD scan tools.
In addition to the professional line
of scan tools, inexpensive
`generic' OBD II scan tool software
programs and handheld units are
readily available. These tools do
have limited capabilities, but they
are nonetheless powerful
diagnostic tools. These tools read
live data streams and freeze frame
data as well as a host of other
valuable diagnostic data.
For the do-it-yourself owner,
simple aftermarket DTC readers
are also available. These
inexpensive BMW-only tools are
capable of checking for DTCs as
well as turning off the illuminated
MIL and resetting the service
indicator lights.
Diagnostic monitors
A diagnostic monitor is an operating
strategy that runs internal tests and
checks a specific system, component
or function. This is similar to computer
self tests.
Completion of a drive cycle ensures
that all monitors have completed their
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