Wiring BMW 325i 1993 E36 Workshop Manual
Page 3 of 759
General
Data
and
010
FundamentalsfortheDo-lt-YourselfOwner
Maintenance
020
Maintenance
Program
Engine
Transmission
Suspension,
Steering
and
Brakes
4
Body
100
Engine-General
110
Engine
Removal
and
Installation
113
Cylinder
Head
Removal
and
Installation
116
Cylinder
Head
and
Valvetrain
117
Camshaft
Timing
Chain
119
Lubrication
System
200
Transmission-General
210
Clutch
230
Manual
Transmission
510
Exterior
Trim,
Bumpers
520
Seats
Bo
y
Equipment
512
DoorWTdws
540
nr
t
513
InteriorTrim
541
Convertible
Top
515
Central
Locking
and
Anti-Theft
600
Electrical
System-General
620
Instruments
Electrical
S
stem
610
Electrical
Component
Locations
630
Exterior
Lighting
611
Wipers
and
Washers
640
Heating
and
Air
Conditioning
6
612
Switches
and
Electrical
Accessories
650
Radio
Equipment
and
720
SeatBelts
Accessories
721
Airbag
System
(SRS)
Electrical
Wiring
Diagrams
Foreword
.
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v
Warnings
and
Cautions
.....
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.
.vii
Index
..............
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back
of
book
300
Suspension,
Steering
and
330
RearSuspension
Brakes-General
331
Final
Drive
310
Front
Suspension
340
Brakes
320
Steering
and
Wheel
Alignment
400
Body-General
411
Doors
410
Fenders,
Engine
Hood
412
Trunk
Lid
120
Ignition
System
121
Battery,Starter,
Alternator
130
Fue¡
Injection
160
Fuel
Tank
and
Fuel
Pump
170
Radiator
and
Cooling
System180
Exhaust
System
240
Automatic
Transmission
250
Gearshift
Linkage
260
Driveshaft
Page 10 of 759
010-2
FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER
HOW
TO
USE
THIS
MANUAL
A
note
contains
helpfulinformation,
tipsthat
will
hefp
in
The
manual
is
divided
into
ninesections
:
doinga
better
job
and
completing
!t
more
easíly
.
0
GENERAL
DATA
AND
MAINTENANCE
1
ENGINE
2
TRANSMISSION
3
SUSPENSION,
STEERING
AND
BRAKES
4
BODY
5
BODY
EQUIPMENT
6
ELECTRICAL
SYSTEM
7
EQUIPMENTANDACCESSORIES
ELECTRICAL
WIRING
DIAGRAMS
0
GENERAL
DATA
AND
MAINTENANCE
coversthe
rec-
ommended
maintenance
schedules
and
service
procedures
needed
to
perform
BMW
scheduled
maintenance
work
.
Also
within
this
section
is
the
010
Fundamentals
for
the
Do-It-
Yourself
Owner
section,
which
contains
basic
instructions,
tips
and
helpful
hints
for
do-it-yourself
maintenance
and
repair
.
The
next
seven
sections
(1
through
7)
are
repair
based
and
are
further
broken
down
into
three
digit
repair
groups
.
Each
ma-
jor
section
begins
with
a
General
repair
group,
e
.g
.
100En-
gine-General
.
These
"00"
(doublezero)
groups
aremostly
descriptive
in
nature,
covering
topics
suchas
theory
of
opera-
tion
and
troubleshooting
.
The
remainder
of
the
repair
groups
contain
the
more
involved
repair
information
.
The
last
major
section
contains
detailed
electrical
wiring
diagram
schematics
.
A
master
listing
of
the
9major
sections
and
the
correspond-
ing
individual
repair
groups
can
befoundon
the
inside
front
cover
.
Each
repair
group
begins
with
a
Table
of
Contents
listing
the
majos
subject
headings
within
the
group
.
Page
numbers
throughout
the
manual
are
organizedaccording
to
the
repair
groupsystem
.
For
example,
youcan
expect
tofind
repair
infor-
mation
on
brakes
(Repair
Group
340)
beginning
on
page
340-
1
.
A
comprehensive
index
can
be
found
at
the
back
of
the
man-
ual
.
Warnings,
Cautions
and
Notes
Throughout
this
manualare
many
passages
with
the
head-
ings
WARNING,
CAUTION,
or
NOTE
.
These
very
important
headings
have
diflerent
meanings
.
WARNING
-
The
text
under
this
heading
warns
of
unsafe
practic-
es
thatare
very
likelyto
cause
ínjury,
eitherby
dírect
threat
to
the
person(s)
pertorming
the
work
or
by
in-
creased
risk
of
accident
or
mechanfcal
fallure
whíle
driving
.
CAUTION-
A
caution
calls
attention
to
important
precautions
to
beobserved
during
the
repair
work
that
will
helo
prevent
accidentally
damaging
the
caror
its
parts
.
GETTING
STARTED
Safety
NOTE-
Please
read
every
WARNING,
CAUTION,
and
NOTE
at
the
front
of
the
manual
and
as
they
appear
in
repair
procedures
.
They
are
very
important
.
Read
them
before
you
begin
any
maintenance
or
repair
job
.
Some
WARNINGs
and
CAUTIONs
are
repeated
wherever
they
apply
.
Read
them
all
.
Do
not
skip
any
.
These
messages
are
important,
even
to
the
owner
who
never
intends
to
workon
thecar
.
GETTING
STARTED
Most
of
the
necessary
maintenance
and
minor
repair
that
an
automobile
will
need
canbe
done
with
ordinary
tools,
evenby
owners
with
little
or
no
experience
in
car
repair
.
Below
is
some
important
information
on
how
to
work
safely,
a
discussion
of
what
tools
will
be
needed
and
how
to
use
them
.
Although
an
automobile
presents
many
hazards,
common
sense
and
good
equipment
can
helo
ensure
safety
.
Many
acci-
dents
happen
because
of
carelessness
.
Pay
attention
and
stick
to
these
few
important
safety
rules
.
WARNING
-
"
Never
run
the
engine
in
the
work
area
unless
it
is
well-ventflated
.
Theexhaustshouldbe
vented
to
the
outside
.
Carbon
monoxide
(CO)
in
theex-
haust
kilts
.
"
Remove
all
neckties,
scarts,
loose
clothing,
or
jewelry
when
working
near
running
engines
or
power
tools
.
Tuck
in
shirts
.
Tie
long
haír
and
se-
cure
it
under
a
cap
.
Severe
injury
can
result
from
these
things
beíngcaught
in
rotating
parts
.
"
Remove
ríngs,
watches,
and
bracelets
.
Asíde
from
the
dangersof
moving
parts,
metallic
jew-
elry
conducts
electricity
and
may
cause
shorts,
sparks,
bums,
or
damage
to
the
electrical
sys-
tem
when
accidentally
contacting
the
battery
or
other
electrical
terminals
.
"
Disconnect
the
battery
negative
()
cable
when-
ever
working
on
ornear
the
fuel
system
or
any-
thlng
that
is
electrically
powered
.
Accidental
electrícal
contact
may
damage
the
electrical
system
or
cause
a
fire
.
Page 14 of 759
010-
6
FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER
In
places
where
a
shaft
mustpass
through
a
housing,
flexible
lip
seals
areused
to
keep
the
lubricating
oil
or
grease
from
leak-
ingout
past
the
rotating
shaft
.
Seals
should
never
be
reused
once
they
have
been
removed
.
When
removing
a
seal,
be
care-
ful
not
lo
scratch
or
otherwise
damage
the
metal
surfaces
.
Even
minor
damage
to
sealing
surfaces
can
cause
sea¡
damage
and
leakage
.
The
key
to
sea¡
installation
is
to
get
the
sea¡
in
straight
without
damaging
¡t
.
Use
a
sea¡
driver
that
is
the
same
diameter
as
the
seal
housing
to
gently
and
evenly
insta¡I
into
place
.
If
a
proper
size
seal
driver
is
not
available,
a
socket
of
the
right
size
will
do
.
When
installing
a
seal,
¡t
a
good
idea
to
coat
the
sea¡
with
o¡I
to
aid
installation
.
Some
seals
are
directional
and
special
instal-
lation
instructions
apply
.
Make
sure
¡t
is
installed
with
the
lip
fac-
ing
the
correct
way
.
Normally
the
lip
faces
the
inside
.
Note
the
installation
direction
of
the
old
sea¡before
removing
¡t
.
Electrical
Testing
Many
electrical
problems
canbe
understood
and
solved
with
only
a
little
fundamental
knowledge
of
how
electrical
circuits
Insulate
the
finished
connection
.
Electronics
stores
can
sup-
function
.
ply
heat-shrinkable
insulating
tubing
that
can
be
placed
onto
the
wire
before
connectiog,
slid
over
the
finished
joint,
and
Electric
current
only
flows
in
a
complete
circuit
.
To
operate,
shrunk
to
a
tight
fit
with
a
heat
gun
orhair
dryer
.
The
nextbest
every
electrical
device
in
thecar
requires
a
complete
circuit
in-
alternative
is
electrical
tape
.
Make
sure
the
wire
is
clean
and
cluding
a
voltage
source
and
a
pathto
ground
.
The
positive
(+)
free
ofsolder
flux
or
other
contamination
.
Wrap
the
joint
tightly
side
of
the
battery
is
the
original
voltagesource,
and
ground
is
to
sea¡
out
moisture
.
See
600
Electrical-General
for
more
in-
any
retum
path
to
the
negative
()
-
side
ofth
e
battery°
whether
li
formation
.
through
the
wiring
harness
or
thecar
body
.
Except
for
portions
of
the
charging
system,
al¡
electrical
current
in
the
car
is
direct
current
(DC)
and
flows
from
positive
(+)
to
negative
(-)
.
BVYING
PART$
Switches
are
used
to
turn
components
on
or
off
by
complet-
ing
or
interrupting
#he
circuit
.
A
switch
is
"open"
when
the
circuit
Many
of
the
maíntenance
and
repair
tasks
in
this
manual
cal¡
is
ínterrupted,
and
"closed"
when
the
circuit
is
completed
.
Fig
.
5
for
the
installation
of
new
parte,
or
the
use
of
new
gaskets
and
shows
a
basic
circuit
schematic
.
See600
Electrical
System-
other
materials
when
reinstalling
parts
.
Most
often,
the
parts
General
for
electrical
troubleshooting
.
that
will
be
needed
should
be
on
hand
beforebeginningthe
job
.
Read
the
introductory
text
and
the
complete
procedure
to
de-
termine
which
parts
will
be
needed
.
B029ELG
Fig
.
5
.
Schematic
representation
of
simple
circuit
for
light
bulb
.
Igni-
tion
switch
is
shown
closed,
making
circuit
complete
.
BVYING
PARTS
Wire
Repairs
Repairs
to
a
wiring
harness
requirespecial
care
to
make
the
repair
permanent
.
The
wire
endsmust
be
clean
.
lf
frayedor
oth-
erwise
damaged,
cut
off
the
end
.
If
the
wire
is
too
short,
splice
in
a
new
piece
of
wire
of
the
same
size
and
make
two
connec-
tions
.
Use
connectors
that
are
designed
for
the
purpose
.
Crimped-
on
or
soldered-onconnectors
are
best
.
Crimp
connectors
and
special
crimping
pliers
are
widely
available
.
If
soldering,
use
needlenose
pliers
tohold
the
wire
near
the
solder
joint
and
cre-
ate
a
"heat
dam"
.
This
keeps
the
heat
and
the
solder
from
trav-
eling
up
the
wire
.
Always
use
a
solder
made
specifically
for
electrical
work
(rosin
core)
.
NOTE-
Twisting
wirestogether
to
make
a
repair
is
not
recom-
mended
.
Corrosion
and
vibration
will
eventually
spoil
the
connection
and
may
lead
to
irreparable
damage
to
sensitive
electronic
componente
.
NOTE-
For
some
bigger
jobs,
partial
disassembly
and
inspec-
tion
are
required
to
determine
acomplete
parts
list
.
Read
the
procedure
carefully
and,
if
necessary,
make
other
arrangements
to
get
the
necessary
parts
while
your
car
is
disassembled
.
Genuine
BMW
Parts
Genuine
BMW
replacement
parts
from
an
authorized
BMW
dealer
are
designed
and
manufactured
lo
the
same
high
stan-
dards
as
the
original
parts
.
They
will
be
the
correct
material,
manufactured
to
the
same
specifications,
and
guaranteed
lo
fit
and
work
as
intended
by
the
engineers
who
designed
thecar
.
Some
genuine
BMW
parts
have
a
limited
warranty
.
Page 17 of 759
Solt
Diameter
and
Wrench
Size
"
M5
.
...
............
....
......
.
.......
8
mm
"
M6
.
.
..............
.
.
...
...........
.10
mm
"
M8
.
.
..............
.
.
..
.....
12mmor13mm
"
M10
..
.............
.
.
...
...........
.17
mm
"
M12
...
...........
..
.
..
............
.19
mm
"
M14
.
..:
.
.........
..
.
..
.............
22
mm
Spark
Plug
Socket
.
A
special
socket
for
spark
plugs
is
the
correct
size,
is
deep
enough
to
accommodate
a
spark
plug's
length,
and
includes
a
rubber
insertto
both
protect
the
spark
plug
from
damage
and
grip
it
for
easier
removal
.
See
Fig
.
9
.
Fig
.
9
.
Spark
plug
socket
.
FUNDAMENTALS
FOR
THEDO-ITYOURSELF
OWNER
010-
9
B003FNG
Pliers
.
A
few
of
the
many
types
ofpliers
are
shown
in
Fig
.
10
.
Mostare
used
for
holding
irregularobjects,
bending,or
crimp-
ing
.
Some
have
special
applications
.
A
needlenose
plier
is
used
for
gripping
small
and
poorly
ac-
cessible
objects,
and
is
useful
for
wiring
and
other
electrical
work
.
A
locking
plier
suchas
theVise-Grip
®
is
useful
because
of
its
tightgrip
.
Snap-ring
and
circlip
pliers
withspecial
tipped
jacas
areused
lo
remove
and
install
snap-ringsor
circlips
.
A
Channel-lock®
or
water
pump
plier
has
adjustable
jacas
that
can
be
quickly
changed
to
match
the
size
of
the
object
being
held
to
give
great-
erleverage
.
An
adjustable
wrench
canbea
useful
addition
to
a
small
tool
kit
.
See
Fig
.
11
.
It
can
substitute
in
a
pinch,
if
two
wrenches
of
the
same
size
are
needed
lo
remove
a
nut
and
bolt
.
Use
extra
care
with
adjustable
wrenches,
as
they
tend
to
loosen,
slip,
and
damage
fasteners
.
Fig
.
11
.
Adjustable
wrench
.
B008FNG
Compared
to
a
wrench
of
the
correct
size,
an
adjustable
wrench
is
always
second
best
.
They
shouldonly
beused
when
the
correct
size
wrench
is
not
available
.
Choose
one
of
average
size
range,
about
6
to
8
inches
in
length
.
Jack
Stands
Strong
jack
stands
are
extremely
important
for
any
work
that
is
done
under
thecar
.
Use
onlyjack
stands
that
are
designed
for
the
purpose
.
Blocks
of
wood,
concrete,
bricks,
etc
.
arenot
safeor
suitable
substitutes
.
WARNING
-
A
jack
should
be
used
only
to
raise
the
vehicle
and
shouldnot
beused
to
support
the
car
for
a
long
pe-
riod
.
Always
use
jack
stands
to
support
a
raised
ve-
hicle
.
Jack
standsare
available
1n
severa¡
styles
.
A
typical
jack
stand
is
shown
in
Fig
.
12
.
The
best
ones
are
made
of
heavy
ma-
terial
for
strength,
have
a
wide
base
for
stability,
and
are
equipped
lo
positively
lock
in
their
raised
positions
.
Get
the
best
ones
available
.
Oil
Change
Equipment
Changing
engine
oil
requires
a
17mm
socket
or
wrench
to
BOO6FNG-
loosen
and
tighten
the
drain
plug
and
a
drain
pan
(at
least
8
qt
.
capacity)
.
An
oil
filter
wrench
is
not
required
.
These
items
are
Fig
.
10
.
Pliers
.
From
left,
snap-ring,
needlenose,
adjustable-joint
shown
in
Fig
.
13
.
A
wide,
loca
drain
pan
wíll
fit
more
easily
under
(Channellock©),
slip-joint,
and
locking(Vise-Grip®)
.
the
car
.
Use
a
funnel
lo
pour
the
new
oil
into
theengine
.
TOOLS
Page 43 of 759
GENERAL
.
.....
.
.
.
.
.
.
.
...
.
.
.
.
.
.
.
.
.
...
100-1
Cylinder
Block
and
Crankshaft
.
.
.
.
.
.
.
.
.
...
100-1
Connecting
Rods
and
Pistons
.
.
.
.
.
.
.
.
.
.
.
.
.
100-1
Cylinder
Head
and
Valvetrain
.
.
.
.
.
.
.
.
.
.
.
.
.
100-2
VANOS
(Variable
Valve
Timing)
.
.
.
.
.
.
.
.
...
100-2
DISA
(Dual
Resonance
Intake
System)
.
.
.
.
.
100-3
Engine
Management
System
.
.
.
.
.
.
.
.
.
.
.
.
.
100-3
Ignition
......
.
.
.
.........
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Fuel
Delivery
..
.
.
.
.....
.
...
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Cooling
System
.
...........
.
.
.
.
.
.....
.
.
100-5
Lubrication
System
.........
.
.
.
.
.
.
.
.
.
.
.
.
100-5
MECHANICALTROUBLESHOOTING
.
.
.
.
100-5
Warnings
and
Cautions
..
.
...
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Cylinder
compression,
checking
.
.
.
.
.
.
.
.
.
.
.
100-6
EngineMechanical
Troubleshooting
Table
.
.
.
100-7
DRIVEABILITY
TROUBLESHOOTING
...
100-8
GENERAL
There
are
various
engíne
configurations
used
in
the
1992-
1998
E36
cars
.
See
Table
a
.
On
both
four-
and
6-cylinder
engines,
the
cylinder
block
is
cast
¡ron
with
integral
cyiinders
.
The
cyiinders
are
exposed
on
all
sides
to
circulating
coolant
.
The
fully
counterweighted
crankshaft
rotates
in
replaceable
split-shell
main
bearings
.
Oiiways
drilled
into
the
crankshaft
pro-
vide
bearing
lubrication
.
O¡I
seals
pressed
into
alloy
sea¡
hous-
ings
are
installedat
both
ends
of
the
crankshaft
.
100
Engine-General
Tablea
.
Engine
Specifications
ENGINE-GENERAL
100-1
On-Board
Diagnostics
(OBD)
...
.
.
.
.
.
.
.
.
.
.
.
100-8
Basic
Requirements
....
.
.
.
...
.
.
.
.
.
....
.100-11
Preventive
Maintenance
......
.
.
.
.
.
.....
100-11
Basic
Engine
Settings
..
.
.....
.
.
.
.
.
.....
100-11
Oxygen
Sensors
.
.
.
...
.
.
.
...
.
.
.
.
.
....
.100-11
Air
Flow
Measurement
and
Vacuum
Leaks
.
.100-12
Battery
Voltage
.
.
...........
.
.
.
.
.
.....
100-12
Wiring
and
Harness
Connections
.
.
.
.
.....
100-13
Ground
Connections
...
.
.....
.
.
.
.
.
.....
100-13
Fue¡
Supply
....
.
...........
.
.
..
.....
.100-14
TABLES
a
.
Engine
Specifications
...
...
...........
.
..
..
.100-1
b
.
Engine
Management
Systems
..
..
...........
..
100-5
c
.
Engine
Mechanical
Troubleshooting
..........
.
.
100-8
d
.
OBD
1
Fault
(Blink)
Codes
(1992-1995
models
only)
.
...
..
..
..........
..
.100-9
e
.
Engine
Driveability
Troubleshooting
...........
.100-15
Model
Engine
code
No
.
of
Dispiacement
Compression
Horsepower
cyiinders
liters
(cu
.
in
.)
ratio
SAE
net
@
rpm
318i/is/¡C
1992-1995
M42
4
1
.8
(109
.6)
10
.0
:1
100
@
6000
1996-1998
M44
4
1
.9
(115
.6)
~
10
.0
:1
103
@
6000
323ís/iC
1998
M52
6
2
.5
(152
.2)
10
.5
:1
168
@
5,500
325i/is/iC
1992-1995
M50
6
2
.5
(152
.2)
10
.0
:1
110
@
5,900
328i/is/iC
1996-1998
M52
6
2
.8
(170
.4)
10
.2
:1
190
@
5,300
M3
1995
S50US
6
3
.0
(182
.5)
10
.5:1
240
@
6,000
1996-1998
S52US
6
3
.2
(192
.3)
10
.5:1
240
@
6,000
Cylinder
Block
and
Crankshaft
Connecting
Rods
and
Pistons
The
forged
connecting
rods
use
replaceable
split-shell
bearings
at
the
crankshaft
endand
solid
bushings
at
the
pis-
ton
pin
end
.
The
pistonsare
of
the
three-ring
typewith
two
up-
per
compression
rings
and
a
lowerone-piece
o¡i
scraper
ring
.
Fui¡-floating
piston
pins
are
retained
with
circlips
.
GENERAL
Page 47 of 759
ignition
Table
b
.
Engine
Management
Systems
engine
has
high
mileage
.
Engine
1
System
4-cylinder
engines
M42
(1992-1995)
Bosch
DME
Ml
.7
M44
(1996-1998)
Bosch
DME
M5
.2
(OBD
II)
6-cylinder
engines
M50
(1992)
Bosch
DME
M3
.1
M50
VANOS
(1993-1995)
Bosch
DME
M3
.3
.1
M52
(1996-1998)
Siemens
MS41
.1
(OBD
II)
S50US
(1995)
Bosch
DME
M3
.3
.1
S52US
(1996-1998)
Siemens
MS41
.1
(OBD
II)
Both
the
4-cylinder
and
6-cylinder
engines
use
a
distributor-
less
ignition
system
with
individual
ignition
coils
for
each
cylin-
der
.
FuelDelivery
Pressurized
fuel
from
the
in-tank
fuel
pump
is
injected
via
solenoid-type
fuel
injectors
.
The
ECM
controls
the
opening
and
closing
of
the
injectors
by
switchingthe
ground
side
of
each
injector
circuit
.
The
exact
amount
of
fuel
injected
is
de-
termined
by
the
amount
of
timethe
injectors
are
open
.
Cooling
System
Whenever
the
engine
is
running,
acoolant
pump
circulates
coolant
through
the
engine
and,
if
either
heater
control
valves
are
open,
through
the
heater
core
in
the
passenger
compart-
ment
.
The
coolant
absorbs
excess
heat
and
carries
it
to
the
ra-
diator
where
it
is
transferred
into
the
passing
airstream
.
A
thermostat
controls
the
flow
of
coolant
through
the
radiator
based
on
engine
temperature
.
Lubrication
System
The
lubrication
system
is
pressurized
whenever
theengine
is
running
.
The
oil
pump
draws
oil
through
a
pickup
in
the
bot-
tom
of
the
oil
pan,thenforces
it
through
a
replaceable
oil
filter
and
finto
the
engine
oíi
passages
.
On
4-cylinder
engines,
the
oil
pump
is
mounted
to
the
front
engine
cover
.
On
6-cylinder
engines,thechain-driven
oil
pump
is
bolted
to
the
bottom
of
the
cylinder
block
.
A
pressure
relief
valve
limits
the
maximum
system
pres-
sure
.
A
bypass
valve
prevents
the
oil
filter
from
bursting
and
insures
engine
lubrication
should
the
filter
become
plugged
.
See
119
Lubrication
System
for
additional
information
.
ENGINE-GENERAL
100-
5
Various
versions
of
DME
systems
are
usedon
thecars
cov-
MECHANICAL
TROUBLESHOOTING
ered
by
this
manual
.
See
Table
b
.
Each
system
is
highly
adaptive
to
compensate
for
things
suchasengine
wear
and
When
troubleshooting
an
engine
that
fails
to
start
or
runs
vacuum
leaks
.
poorly,
first
check
its
mechanical
condition-particularly
if
the
Warnings
and
Cautions
For
personal
safety,
as
well
asthe
protection
of
sensitive
electronic
components,
the
following
warnings
and
cautions
must
be
adhered
to
during
all
troubleshooting,
maintenance,
and
repairwork
.
WARNING
-
"
The
ignition
system
produces
high
voltages
that
can
be
fatal
.
Avoid
contact
with
exposed
termi-
nals
anduse
extreme
caution
when
working
on
a
car
with
the
ignition
switched
on
or
the
engine
running
.
"
Do
not
touch
or
disconnect
any
high
voltage
ca-
bles
from
the
coil,
distributor,
orspark
plugs
while
the
engine
is
running
or
being
cranked
by
the
starter
"
Connect
and
disconnect
the
engine
manage-
ment
system
wiring
and
test
equipment
leads
only
when
the
ignition
is
switched
off
.
"
Gasoline
is
highly
flammable
and
its
vapors
are
explosive
.
Do
not
smoke
or
work
on
a
car
near
heaters
or
other
fire
hazards
when
diagnosing
and
repairing
fuel
system
problems
.
Have
a
fire
extínguisher
available
in
case
of
an
emergency
.
"
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
control
module
memory
.
Using
special
BMW
diagnosnnc
equipment,
check
for
fault
codes
prior
to
disconnecting
the
battery
cables
.
If
the
Check
Engine
lightis
illuminated,
see
On-
Board
Diagnostics
(OBD)
forfault
code
infor-
mation
.
If
any
other
system
faults
havebeen
de-tected
(indicated
byan
illuminated
warning
light),
see
an
authorized
BMW
dealer
.
CAUTION-
"
Prior
to
disconnecting
the
battery,
read
the
bat-
tery
disconnection
cautions
gíven
at
the
front
of
this
manual
on
page
viii
.
"
Do
notconnect
any
test
equipment
that
delivers
a
12-volt
power
supply
to
terminal15
(+)
of
the
ignition
coil
.
The
current
flow
may
damage
the
ECM
.
In
general,
connect
test
equipment
only
as
specified
by
BMW,
this
manual,
or
the
equip-
ment
maker
.
"
Do
not
disconnect
the
battery
with
the
engine
running
.
Do
notrunthe
engine
with
any
of
the
sparkplug
wires
disconnected
.
MECHANICAL
TROUBLESHOOTING
Page 51 of 759
NOTE-
"
On
carswith
OBD
ti,
specialized
OBD
11
scan
tool
equipment
must
be
used
to
access
the
DTCs,
either
using
the
BMW
special
tool
ora
`generic"
OBD
11
scan
tool
.
See
130
Fuel
Injection
.
"
The
08D
11
fault
memory
(including
an
iiluminated
Check
Engine
light)
can
only
be
reset
using
the
spe-
cial
scan
tool
.
Removing
the
connector
from
the
ECM
or
disconnecting
the
battery
will
not
erase
the
fault
memory
.
Table
d
.
OBD
1
Fault
(Blink)
Codes
(1992-1995
modeis
only)
Graphic
representation
of
flashing
Check
Engine
light
fault
code
:
1221
5
Seconds
.
:-
2
.5~-
--05--
Fault
code
and
meaning
1
Corrective
action
Code
1216
:
Throttle
potentiometer
Code
1218
:
Output
stage,
group#1
(DME
3
.3
.ionly)
Code
1219
:
Output
stage,
group
#2
(DME
3
.3.1
only)
Code
1221
:
Oxygen
sensor
#1
Code
1224
:
Air
temperature
sensor
(NTC)
Code
1226
:
Knock
sensor
#2
(DME
3
.3
.1
only)
130
ENGINE-GENERAL
100-
9
2
.5
seconds,
then
go
off
for
2
.5
seconds
.
At
thispoint,
the
fault
codes
will
begin
to
flash
.
See
Table
d
.
If
more
than
one
fault
has
been
detected,
eachcode
will
be
separated
by
a2
.5
second
pause
.
When
al¡
fault
codes
havebeen
displayed,
there
will
be0
.5
second
flash
and
thenthe
light
will
remain
off
.
To
read
the
codes
again,
turn
the
key
off
and
then
on
again
.
Depress
theaccelerator
pedal
to
the
floor
five
times
quickly
(within
5
seconds)
.
The
codes
will
begin
to
repeat
.
On
cars
with
OBD
I,
fault
codes
can
be
read
by
turning
the
To
erase
the
fault
code
memory,
first
make
sure
the
fault
ignition
key
on
and
fully
depressing
theaccelerator
pedal
to
code
1000
(short
blink
and
then
light
goes
out
for
long
period)
the
floor
five
times
within
five
seconds
.
TheCheck
Engine
is
present,
then
depress
the
throttle
fully
for
at
least
10
sec-
light
will
then
remain
on
for
five
seconds,
blink
off,
come
on
for
onds
.
Read
the
fault
codes
as
described
earlier
and
check
for
the
1444
code
(no
faults
stored)
.
-,--------------
Check
Engine
light
on
Check
Engine
light
off
Code
1211
:
DM
E
Control
Module
DME
control
module
may
be
faulty
.
This
code
appears
if
the
control
module
fails
the
self
test
.
Check
inputsto
control
module
.
Repair
Group
130
Code
1215
:
Mass
air
flow
sensor
Check
air
flow
or
mass
air
flow
sensor
and
wiring
to
sensor
.
Repair
Group
130
Test
throttle
potentiometer
resistance
and
wiring
.
Repair
Group
130
Test
DME
control
module
input/outputs
.
Repair
Group
130
Test
DME
control
module
input/outputs
.
Repair
Group
130
Check
sensor
output
signal
to
DME
control
module
.
Repair
Group
Code
1222
:
Oxygen
sensor
lean/rich
control
stop
Check
for
intake
air
leaks
or
reasons
forrich
míxture
.
See
Driveabil-
ity
Troubleshooting
given
earlier
in
this
repair
group
Code
1223
:
Coolant
temperaturesensor
(NTC)
1
Test
coolant
temperature
sensor
.
Repair
Group
130
Test
intake
air
temperature
sensor
.
Repair
Group
130
Code
1225
:
Knock
sensor#1
(DME
3
.3
.1
only)
1
Check
knocksensorand
sensor
wiring
.
Repair
Group
120
Check
knocksensor
and
sensor
wiring
.
Repair
Group
120
Code
1231
:
Batteryvoltage
monitor
Test
battery
voltage
and
battery
check
charging
system
and
starter
.
Repair
Group
121
Code
1234
:
Speedometer
"A"signal
(DME
3
.3
.1
only)
Check
wiring
between
instrument
cluster
and
DME
control
module
.
Electrical
Wiring
Diagrams
Code
1237
:
A/C
compressor
cutoff
(DME
3
.3
.1
only)
Test
DME
control
module
inputs/outputs
from
A/C
system
.
Repair
Group
130
Code
1242
:
A/C
compressor
signal
(DME
3
.3.1
only)
Test
DME
control
module
inputs/outputs
from
A/C
system
.
Repair
Group
130
DRIVEABILITY
TROLIBLESHOOTING
Page 52 of 759
100-
1
0
ENGINE-GENERAL
Table
d
.
OBD
I
Fault
(Blink)
Codes
(continued)
(1992-1995
modeis
only)
Graphic
representation
of
flashing
Check
Engine
light
fault
code
:
1221
-
;
5
Seconds
.
;--~
2
.5
r
----------------
Check
Engine
light
on
Fault
code
and
meaning
Corrective
action
Check
Engine
light
off
Code
1243
:
Crankshaft
position
sensor
(DME
3
.3
.1
only)
Test
crankshaft
position/rpm
sensor
and
wiring
from
sensor
lo
DME
control
module
.
Repair
Group
120
Code
1244
:
Camshaft
position
sensor
(DME
3
.3
.1
only)
Test
camshaft
position
sensor
and
wiring
fromsensor
to
DME
con-
trol
module
.
Repair
Group
130
Code
1245
:
Electronic
transmission
control
intervention
(DME
3
.3
.1
Check
wiring
between
DME
control
module
and
auto
.
transmission
only)
control
module
Code
1247
:
Ignition
secondary
monitor
(DME
3
.3
.1
only)
Check
secondary
voltage
lo
ignition
coils
.
Check
wiringat
ignition
coils
.
Repair
Group
120
Code
1251
:
Fuel
injector
#1
(DME
3
.113
.3
.1
only)
1
Test
injector
operation/signal
lo
injector
.
Repair
group130
Code
1252
:
Fuel
injector
#2
(DME
3
.113
.3
.1
only)
Test
injector
operation/signal
lo
injector
.
Repair
group130
Code
1253
:
Fuel
injector
#3
(DME
3
.1/3
.3
.1
only)
Test
injector
operation/signal
to
injector
.
Repair
group130
Code
1254
:
Fuel
injector
#4
(DME
3
.1/3
.3
.1
only)
Test
injector
operation/signal
to
injector
.
Repair
group
130
Code
1255
:
Fuel
injector
#5
(DME
3
.1/3
.3
.1
only)
Test
injector
operation/signal
to
injector
.
Repair
group130
Code
1256
:
Fuel
injector
#6
(DME
3
.1/3
.3
.1
only)
Test
injector
operation/signal
lo
injector
.
Repair
group130
Code
1261
:
Fuel
pump
control
Test
fuel
pump
relay
and
fuel
pump
circuit
.
Repairgroup
160
Code
1262
:
Idle
speed
control
Test
idleair
controlvalve
and
signalto
valve
.
Repair
Group
130
Code
1263
:
Fuel
tank
evaporative
(EVAP)
system
Test
EVAP
purge
valve
.
Repair
Group
160
Code
1264
:
Oxygen
sensor
heater
1
Test
oxygen
sensorheater
and
heater
relay
.
Repair
group
130
Code
1265
:
Check
engine
lamp
(DME
3
.3.1
only)
1
Test
for
faulty
bulb
or
wiring
.
Electrical
Wiring
Diagrams
Code
1266
:
VANOS
(DME
3
.3
.1
only)
1
Test
VANOS
solenoid
.
Check
for
signal
to
VANOS
solenoid
.
Code
1267
:
Air
pump
relay
control
(DME
3
.3
.1
only)
Test
air
pump
relay
and
wiring
(where
applicable)
Electrical
Wiring
Diagrams
Code
1271
:
Ignition
coil
#1
(DME
3
.3.1
only)
Test
ignitioncoil
and
wiring
toignitioncoil
.
Repair
Group
120
Code
1272
:
Ignition
coil
#2
(DME
3
.3.1
only)
Test
ignitioncoil
and
wiring
loignitioncoil
.
Repair
Group
120
Code
1273
:
Ignition
coil
#3
(DME
3
.3.1
only)
Test
ignitioncoil
and
wiring
loignitioncoil
.
Repair
Group
120
Code
1274
:
Ignítion
coil
#4
(DME
3
.3.1
only)
Test
ignitioncoil
and
wiring
toignitioncoil
.
Repair
Group
120
Code
1275
:
Ignitioncoil
#5
(DME
3
.3.1
only)
Test
ignition
coil
and
wiring
loignitioncoil
.
Repair
Group
120
Code
1276
:
Ignition
coil
#6
(DME
3
.3.1
only)
Test
ignitioncoil
and
wiring
loignitioncoil
.
Repair
Group
120
Code
1281
:
DME
control
module
memory
supply
(DME
3
.3
.1
only)
Check
voltage
supply
from
battery
lo
DME
control
module
.
Electri-
Code
1282
:
Fault
code
memory
(DME
3
.3.1
only)
Check
DME
control
module
inputs/outputs
.
Control
module
may
be
faulty
.
Repair
Group
130
Code
1283
:
Fuel
injector
output
stage
(DME
3
.3
.1
only)
Check
DME
control
module
inputs/outputs
.
Control
module
may
be
faulty
.
Repair
Group
130
DRIVEABILITY
TROUBLESHOOTING
cal
Wiring
Diagrams
Page 55 of 759
If
a
battery
cableconnection
hasno
visible
faults,
but
is
still
suspect,
measure
the
voltage
drop
across
the
connection
.
A
large
drop
indicates
excessive
resistance,
meaning
the
con-
nection
is
corroded,
dirty,
or
damaged
.
Clean
or
repair
the
connection
and
retest
.
NOTE-
For
instructions
on
conducting
a
voltage
drop
test,
and
other
general
electrical
troubleshooting
information,
see600
Electrical
System-General
.
Wiring
and
Harness
Connections
The
electronic
fuel
injection
and
ignition
systems
operate
at
low
voltage
and
current
values,
making
them
sensitive
to
small
increases
in
resistance
.
The
electrical
system
is
routine-
ly
subjected
to
corrosion,
vibration
and
wear,
so
faults
or
cor-
rosion
in
the
wiring
harness
and
connectors
are
common
causes
of
driveability
problems
.
Visually
inspect
all
wiring,
connectors,
switches
and
fuses
in
the
system
.
Loose
or
damaged
connectors
can
cause
inter-
mittent
problems,
especially
the
smallterminals
in
the
ECM
connectors
.
Disconnect
the
wiring
harness
connectors
to
check
for
corrosion
;
and
use
electrical
cleaning
spray
to
re-
move
contaminants
.
Often,
simply
disconnecting
and
recon-
necting
a
dirty
connector
several
times
will
clean
the
terminals
and
help
to
reestablish
good
electrical
contact
.
If
a
wiring
harnessconnectorhasno
visible
faults,
but
is
still
suspect,
measure
the
voltage
drop
across
the
connector
.
A
large
drop
indicates
excessive
resistance,
meaning
the
con-
nector
is
corroded,
dirty
or
damaged
.
Clean
or
repair
the
con-
nector
and
retest
.
Ground
Connections
For
any
electrical
circuit
to
work,
it
must
make
acomplete
path,
beginning
at
the
positive
(+)
battery
terminal
and
ending
at
the
negative
(-)
terminal
.
The
negative
(-)
battery
cable
is
attached
to
the
car's
chassis
.
Therefore,
any
wireor
metal
part
attached
to
the
chassis
provides
a
good
ground
path
back
to
the
negative
(-)
battery
terminal
.
Poorground
connections
are
amajor
source
of
driveabílity
problems
.
If
any
of
themainground
connections
for
the
igni-
tion
system
or
the
fuelinjection
system
are
faulty,
the
in-
creased
resistance
in
that
circuit
will
cause
problems
.
Visually
inspect
al¡
ground
wires
and
connections
for
breaks,
looseness
or
corrosion
.
Be
careful
because
wires
sometimes
break
internally
or
in
areas
not
easily
visible
.
The
main
grounds
for
the
DME
system
are
shown
in
Fig
.
11,Fig
.
12,
and
Fig
.
13
.
Also
check
the
main
fuel
pump
ground
in
the
center
console,
below
the
emergency
brake
handle
.
If
a
ground
connection
has
no
visiblefaults,
but
is
still
suspect,
measure
the
voltage
drop
acrossthe
connection
.
A
large
drop
indicates
high
resistance,
meaning
the
connection
is
corroded,
dirty
or
damaged
.
Clean
or
repair
the
connection
and
retest
.
ENGINE-GENERAL
100-
1
3
UU,~uyi
Fig
.
11
.
Mainground
(arrow)
for
engine
management
system
.
Grounds
are
in
right
rear
of
engine
compartment
.
Fig
.
12
.
Mainground
for
ignition
coils
on
MS
41
.1
engine
manage-
ment
system
(arrow)
.
DRIVEABILITY
TROLIBLESHOOTING
Page 59 of 759
110
Engine
Removal
and
Installation
GENERAL
.
.
.
.
.......
.
.
.
..........
.
...
110-1
Engine,
removing
and
installing
(4-cylinder
engines)
.
..
.....
..
...........
110-1
ENGINE
REMOVAL
AND
INSTALLATION
110-1
Engine,
removing
and
installing
(6-cylinder
engines)
..
...
...
..
.....
..
....
110-4
GENERAL
Some
special
tools
are
required
for
removal
and
installation
of
the
engine
.
Be
sure
to
have
the
necessary
equipment
on
hand
before
starting
thejob
.
CAUTION-
"
Engine
removal
requires
disconnecting
the
bat-
tery
.
This
may
erase
any
system
fault
code(s)
that
havebeen
stored
in
control
unit
memories
.
Check
forfault
codes
prior
to
disconnecting
the
battery
cables
.
"
If
the
Check
Engine
lightis
illuminated
with
the
engine
running,
see
100
Engine-General
for
On-Board
Diagnostics
(08D)
fault
code
infor-
mation
.
"
If
any
other
system
faults
have
been
detected,
as
indicated
by
an
illuminated
ANTI
LOCK,
SRS
or
AST
warning
light,
see
the
appropriate
repair
group
inthis
manual
or
an
authorized
BMW
dealer
for
more
information
on
fault
codes
.
ENGINE
REMOVALAND
INSTALLATION
Engine,
removing
and
installing
(4-cylinder
engines)
Cover
al¡
painted
surfaces
before
beginning
theremoval
procedure
.
Asan
aid
to
installation,
label
al¡
components,
wires,
and
hoses
before
removing
them
.
Do
not
reuse
gas-
kets,
O-rings
or
seals
during
reassembly
.
WARNING
-
Due
to
risk
of
personal
injury,
be
sure
the
engine
is
cold
before
beginning
the
removalprocedure
.
1.
Disconnect
negative
(-)
cable
from
battery
in
luggage
compartment
.
0011969
CAUTION-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.
ENGINE
REMOVAL
AND
INSTALLATION
110-1
2
.
Remove
transmission
from
car
.
See230
Manual
Transmission
or
240
Automatic
Transmission
.
3
.
Remove
enginehood
or
place
hood
in
service
positíon
.
See
410
Fenders,
Engine
Hood
.
NOTE-
tt
is
notnecessary
to
remove
the
engine
hood,
but
it
is
helpful
and
will
make
engine
removal
and
installation
easier
.
4
.
Remove
splash
guard
under
engine,
if
applicable
.
5
.
Unbolt
ignition
coil
assembly
from
bracket
on
strut
tow-er
.
Disconnect
wiring
to
ignition
cofs,
then
place
coil
assembly
on
engine
.
6
.
Disconnect
al¡
cables
and
harness
connectors
at
throt-
tle
housing
.
7
.
Unbolt
andremove
complete
air
cleaner
housing
with
mass
air
flow
sensor,
disconnecting
and
labeling
con-
nectors,
ducting
and
hoses
asnecessary
.
See
Fig
.
1
.
Fig
.
1
.
Intake
air
duct
hose
clamp
(A),
mass
air
flow
sensor
connec-
tor
(B),
and
air
cleanerto
air
flow
sensor
clips
(C)
on
M44
en-
gine
.
ENGINE
REMOVAL
AND
INSTALLATION