BMW 1999-2005 M3 Service Manual page 1230

On-Board Diagnostics
3 of 11
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/8...
The MIL will come on under the
following conditions.
An engine management system
fault is detected for two
consecutive OBD II drive cycles.
A catalyst damaging fault.
A component malfunction (such
as catalyst deterioration) causes
emissions to exceed 1.5 times
OBD II standards.
Manufacturer-defined
specifications are exceeded.
An implausible input signal is
generated.
Misfire faults occur.
A leak is detected in evaporative
system.
The oxygen sensors observe no
purge flow from purge
valve/evaporative system.
The engine control module (ECM)
fails to enter closed-loop operation
within specified time.
The engine control module (ECM)
or automatic transmission control
module (TCM) enters "limp home"
operation mode.
Key is in "ignition on" position
before cranking (bulb check
function).
2/25/2009 11:22 PM