1993 BMW M3 Tachometer
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Graphic
representation
of
flashing
Check
Engine
light
fault
code
:
1221
-
;
5
Seconds
.
~-
2
.5;-
Fault
code
and
meaning
Corrective
action
Code
1286
:
Knock
control
test
pulse
(DME
3
.3
.1
only)
Check
DME
control
module
inputs/outputs
.
Control
module
may
be
faulty
Repair
Group
130
Code
1000
(light
remains
off)
:
End
of
fault
code
output-all
fault
codes
have
been
displayed
.
No
~
corrective
action
necessary
.
Repeat
test
if
necessary
Code
1444
:
No
more
faults
.
No
corrective
action
necessary
.
This
code
must
be
present
lo
erase
fault
memory
Basic
Requirements
Preventive
Maintenance
The
following
list
contains
basic
checks
that
should
be
made
when
experiencing
driveability
problems
.
1
.
Check
intake
(induction)
system
for
leaks
.
Check
for
cracked,
loose,
or
disconnected
hoses
and
duct
work
.
Check
that
all
hose
clamps
are
tight
.
NOTE-
An
air
leak
allows
unmeasured
airto
enter
the
engine,
offen
resulting
in
an
in
overly
lean
fuel
mixture
and
causing
driveability
problems
which
will
cause
the
Check
Engine
light
to
come
on
.
Table
d
.
OBD
I
Fault
(Blink)
Codes
(continued)
(1992-1995
models
only)
7
-
1
--------------
Check
Engine
light
on
ENGINE-GENERAL
100-
1
1
Check
Engine
light
off
The
condition
of
the
fuel,
ignition
and
emission
controlsys-
tem
components
has
a
directeffect
onengineperformance
and
driveability
.
BMW
specifies
maintenance
of
certain
parts
at
regular
intervals
lo
keep
the
engine
in
proper
tune
.
Extend-
ing
maintenance
intervals
beyond
the
time
or
mileagerecom-
mended
bythe
manufacturer
can
adversely
affect
the
way
the
engine
runs
.
When
troubleshooting
driveability
problems,
a
good
starting
point
is
to
perform
a
major
engine
service,par-
ticularly
if
one
is
overdue
.
For
maintenance
schedules,
major
engine
service
and
other
driveability-related
maintenance
procedures,
see020
Maintenance
Program
.
Basic
Engine
Settings
2
.
Check
that
the
battery
isin
good
condition
.
Check
that
the
cables
are
tight
and
free
of
corrosion
at
both
ends
.
Idle
speed,
idle
mixture
(%CO),
and
ignition
timing
are
not
Check
that
all
related
ground
points
are
firmly
connect-
adjustable
.
The
adaptive
engine
management
system
is
de-
ed
and
in
good
condition
.
Check
al¡
harness
connectors
signed
lo
automatically
compensate
for
changes
in
engine
op-
for
damage
and
corrosion
.
erating
conditions,
although
the
adaptive
range
is
limited
.
Once
these
limits
are
exceeded,
driveability
problems
usually
3
.
Check
for
prwer
and
ground
at
the
Engine
Control
become
noticeable
.
Module
(ECM)
.
Check
the
main
grounds
for
the
ECM
.
See130
Fuel
Injection
.
NOTE-
If
the
DME
adaptive
limits
are
exceeded,
the
Check
En-
4
.
Check
the
fuses
.
Check
for
sufficient
fuel
in
the
tank
.
If
gine
light
will
come
on,
indicating
an
emission
related
the
engine
ranout
of
fuel,
it
will
take
a
little
time
to
re-
fault
.
See
130
Fuel
Injection,
store
fuel
pressure
.
See
160
Fuel
Tank
and
Fuel
Pump
.
Oxygen
Sensors
5
.
Check
for
spark
at
the
spark
plugs
.
If
the
tachometer
needle
bounces
while
the
engine
is
crankedby
the
A
high
oxygen
level
in
the
engine
exhaust
indicates
a
lean
starter
then
the
ignition
system
is
probably
working
cor-
air-fuel
mixture
and
a
low
oxygen
level
indicates
a
rich
mix
rectly
.
See
120
Ignition
System
.
ture
.
The
oxygen
sensor,
shown
in
Fig
.
10,
measures
the
oxy-
gen
content
in
the
exhaust
gasand
generates
a
variable
6
.
Check
for
any
faults
through
the
On-Board
Diagnostics
voltage
signal
.
Using
that
feedback
signal
asan
input,
the
system
.
See
On-Board
Diagnostics
(OBD)
.
DME
control
module
fine
tunes
the
air-fuel
mixture
.
DRIVEABILITY
TROUBLESHOOTING
Page 648 of 759
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Page 652 of 759
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