pressure switch BMW M3 1995 E36 User Guide
Page 115 of 759
119
Lubrication
System
LUBRICATION
SYSTEM
119-1
GENERAL
.
.
.
.
.
.
...
.
.
.
.
.
.
.
...,
,
...
.
.
.
.
119-1
OH
pan,
removing
and
installing
(6-cylinder
engine,
1992
models)
.
.
.
.
.
.
.
.
.
119-4
TROUBLESHOOTING
.
.
.
.
.
.
...
.
.
.
.....
.
119-1
Oil
pan,
removing
and
installing
Oil
pressure,
checking
.
.
.
.
.
.
...
.
.
.
.
.
.
.
.
.
119-1
(6-cylinder
engine,
1993
and
later
models)
.119-6
Oil
pressure
warning
system,
testing
.
.
.
.
.
.
.
119-2
OIL
PUMP
.
.......
.
.............
.119-8
OIL
PAN
.
.
.
.
.
.....
.
.
.
.
.
......
.
.
.
.
.
.
.
..
119-2
Oil
pump,
removing
and
installing
Oil
pan,
removing
and
installing
(4-cylinder
engine)
.
.
.
...
.
..........
.
.
.119-8
(4-cylinder
engines)
.
.
...
.
....
.
.
.
.
.
.
.
..
119-2
Oil
pump,
removing
and
installing
(6-cylinder
engine)
.
.
.....
.
.........
.
.119-10
GENERAL
Oil
pressure,
checking
The
oil
pan
and
the
oil
pump
can
be
removed
with
theen-
gine
installed,
although
engine
liftinglsupport
equipment
is
necessary
.
NOTE-
Oil
change
procedure
and
oil
filter
replacement
are
covered
in
020
Maintenance
Program
.
Al¡
engines
are
equipped
with
an
oil
pressure
warning
sys-
tem
to
help
prevent
engine
damage
.
Other
safety
features
in-
clude
:
"
A
filter
bypass
to
provide
lubrication
should
the
oil
filter
become
clogged
.
"
An
oil
pump
pressure
relief
valve
to
prevent
excessive
system
pressure
.
TROUBLESHOOTING
The
lubrication
warning
system
consists
of
an
oil
pressure
switch
mounted
in
the
oil
circuit
and
an
instrument
panel
warn-
ing
light
.
CAUTION-
If
the
red
oil
pressurewarning
light
comes
on
or
flashes
on
while
driving,
always
assume
that
the
oil
pressure
is
low
.
To
perform
an
oíl
pressure
test,
BMW
specifies
special
tools
that
attach
to
thetop
of
the
oíl
filter
housing
.
The
following
pro-
cedure
works
well
using
standard
automotive
oil
pressure
testing
equipment
attached
to
the
oil
pressure
switch
port
in
the
engine
.
In
some
engines,
however,
access
tothis
port
may
be
extremely
restricted
.
1
.
Disconnect
harness
connector
from
oil
pressure
switch
andremove
switch
.
See
Fig
.
1
.
NOTE-
Thoroughly
clean
around
the
oil
pressure
switchbefore
removing
it
.
Fig
.
1
.
Oil
pressure
switch
location
on
M50
engine
(arrow)
.
TROUBLESHOOTING
Page 116 of 759
119-2
LUBRICATION
SYSTEM
NOTE-
Component
Location
If
the
light
does
not
go
out,
thewiring
to
theswitch
is"
Oil
pressure
switch
most
likely
grounded
somewhere
between
the
switch
all
engines
.......
...
.
..
......
ora
oil
filter
housing
terminal
and
the
warning
light
.
Sea
Electrical
Wiring
Diagrams
atrearof
manual
for
electrical
schematics
.
CAUTION-
Some
oil
may
drain
out
as
the
oil
pressure
switch
is
removed
.
Use
a
rag
to
soak
up
any
spills
.
2
.
Install
pressure
gauge
in
place
of
switch
.
3
.
With
gauge
instalied,
start
engine
and
allow
to
reach
operating
temperature
.
Check
oil
pressureboth
cold
and
hot
.
NOTE-
For
the
most
accurate
test
results,
the
engine
oil
(and
filter)
shouldbe
newand
of
the
correct
grade
.
Oil
Pressure
"
¡dle
(mínimum)
..
.
.
..............
.
.
0
.5
bar
(7psi)
"
Regulated
pressure
(elevated
engine
speed)
4-cylinder
engines
..
......
4
.3
±
0
.2
bar
(63
t3
psi)
6-cylinder
engines
.
.
.............
.
4
.0
bar
(59
psi)
4
.
Remove
pressure
gauge
and
reinstall
pressure
switch
.
If
testing
shows
low
oil
pressure,
one
or
more
of
the
follow-
ing
conditions
may
be
indicated
:
OIL
PAN
"
Worn
or
faulty
oii
pump
.
"
Worn
or
faulty
engine
bearings
The
oil
pancan
be
removed
with
the
engine
instalied,
al-
Severe
engine
wear
.
though
specíal
enginesupport
equipment
will
be
needed
.
Al¡
of
these
conditionsindicate
the
need
for
major
repairs
.
Oil
pressure
warning
system,
testing
When
the
ignition
is
tumed
ora,
the
oil
pressure
warning
light
comes
ora
.
When
the
engine
ís
started
and
the
oil
pressure
ris-
es
slightly,
the
oil
pressure
switch
opens
and
thewarning
light
goes
out
.
Make
sure
the
oil
leve¡
is
correct
before
making
tests
.
1
.
Turra
ignition
switch
ora
.
"
Warning
light
ora
instrument
panel
must
light
up
.
2
.
Remove
connector
from
oil
pressure
switch
.
"
Warning
light
ora
instrument
panel
must
go
out
.
OIL
PAN
3
.
If
warning
light
does
not
light
when
ignition
is
ora,
re-
move
connector
from
oil
pressure
switch
anduse
a
jumper
wire
to
ground
connector
terminal
to
a
clean
metal
surface
.
NOTE
-
If
the
warning
light
comes
ora,
check
the
switch
as
de-
scríbed
in
the
nextstep
.
If
the
warning
light
does
not
come
ora,
thewiring
to
the
instrument
cluster
or
to
the
light
itself
isfaulty
.
4
.
To
test
switch,
connect
ara
ohmmeter
between
terminal
in
switch
body
and
ground
.
With
engine
off,
these
should
be
continuity
.
With
engine
running,
oil
pressure
should
opera
switch
and
there
should
beno
continuity
Replace
a
faulty
switch
.
WARNING
-
Keep
in
mind
that
low
oil
pressure
may
be
prevent-
ing
the
switch
from
tuming
the
light
out
.
If
the
light
remains
ora
while
the
engine
is
running,
check
the
oil
pressure
asdescribed
earlier
.
Do
not
drive
the
car
until
the
problem
is
corrected
.
Theengine
may
be
severely
damaged
.
Oil
pan,
removing
and
installing
(4-cylinder
engines)
1
.
Raise
car
arad
place
securely
ora
jackstands
.
2
.
Remove
splash
shíeld(s)
from
under
engine,
where
ap-
plicable
.
3
.
Drain
engine
oil
as
described
in
020
Maintenance
Pro-
gram
.
4
.
Disconnect
vacuum
hose
adapter
from
vacuum
brake
booster
at
rear
of
engine
compartment
.
5
.
Remove
oil
dipstick
guide
tube
mounting
nut
and
pull
guide
tube
from
oil
pan
.
See
Fig
.
2
.
Page 155 of 759
Oxygen
Sensor
FUEL
DELIVERY
TESTS
FUEL
INJECTION
130-
9
"
Voltage
at
¡dle
..
.
..
..
....
0
.2
to
0
.8
VDC,
fluctuating
Checking
fuel
delivery
is
afundamental
part
of
trouble-
shooting
and
diagnosing
the
engine
management
system
.
Fuel
pressure
directly
influences
fuel
delivery
.
An
accurate
NOTE-
fuel
pressure
gauge
will
be
needed
to
make
the
tests
.
To
check
sensorresponse
to
lean
and
rich
mixtures,
createenairleak,
orpull
vacuumhoseofffue¡
pressure
There
are
three
significant
fuel
delivery
values
to
be
mea-
regulator
to
increase
fuel
pressure
.
sured
:
3
.
Separate
sensorharness
connector
from
sensor
.
Check
for
battery
voltage
between
terminals
3
and
4
(green
wire
and
brown
wire)
in
main
wiring
harness
side
of
con-
nector
with
engine
running
.
If
voltage
is
not
present,
check
oxygen
sensor
heater
relay
.
See610
Electrical
Component
Locations
.
4
.
Check
heater
element
resistance
between
terminals
3
and
4
in
sensor
side
of
connector
.
If
element
is
electri-
cally
open
(no
continuity),
replace
sensor
.
NOTE-
The
oxygen
sensor
heater
relay
is
mounted
in
the
main
power
distributfon
box
in
the
left
rear
of
the
engine
com-
partment
.
Refer
to
Fig
.
6
.
The
heater
relay
is
energized
wíth
positive
(+)
battery
voltage
from
the
main
relayanda
switched
ground
from
the
ECM
.
See
Electrical
Wir-
ing
Diagrams
.
"
Oxygen
sensor
to
exhaust
pipe
...
..
55
Nm
(41
ft-Ib)
"
System
pressure-created
by
the
fuel
pump
and
main-
tained
by
the
pressure
regulator
.
"
Fuel
delivery
volume-created
by
the
fuel
pump
and
af-
fected
by
restrictions,
suchasclogged
fuel
filter
.
"
Residual
pressure-the
pressure
maintained
in
the
closed
system
after
the
engine
and
fuel
pump
are
shut
off
.
Procedures
for
measuring
the
first
two
quantities
arede-
scribed
in
160
Fuel
Tank
and
Fuel
Pump
.
Residual
fuel
pres-
sure
is
checked
using
the
procedure
detailed
later
in
this
group
.
Operating
fuel
pump
fortests
To
operate
the
fuel
pump
for
testing
purposes
without
hav-
íng
to
runthe
engine,
the
fuel
pump
relay
can
be
bypassed
to
power
the
pump
directly
.
Fuel
pump
relay
location
is
shown
in
Fig
.
6
.
5
.
¡f
oxygen
sensor
doesn't
produce
a
fluctuating
voltage
To
runthe
fuel
pump,
remove
the
fuel
pump
relay
and
con-
and
preheater
circuit
is
OK,
replace
sensor
.
nect
the
socket
for
relayterminal
30
to
the
socket
for
relay
ter-
mina¡
87
with
a
fused
jumper
wire
.
After
completing
the
tests,
NOTE-
remove
the
jumper
wire
.
If
not
already
applied,
coat
the
oxygen
sensor
threads
with
an
anti-seize
compound
before
installation
.
Do
not
CAUTION-
getthe
compound
on
the
sensor
tip
.
"
Relay
locations
may
vary
.
Use
care
when
identi-
fying
relays
and
making
electrical
checks
at
the
fuselrelay
panel
.
See
610
Electrical
Compo
Tightening
Torque
nent
Locations
for
additional
relay
information
.
"
The
fuel
pump
relay
has
a
1
.5
mm2
red
wire
at
ter-
minal
30
in
the
relay
socket
.
Terminal
87
has
a
1
.5
mm
2
greenlviolet
wire
.
See
Electrical
Wiring
Di-
agrams
for
additional
wiring
information
.
NOTE-
Thejumper
wire
should
be
1.5
mm2
(14
ga
.)
and
in-
clude
an
in-line
tuse
holder
with
a15
amp
tuse
.
To
avoid
fuselrelay
panel
damage
from
repeated
connect-
ing
and
disconnecting,
also
include
a
toggle
switch
.
A
heavy-duty
jumper,
BMW
tool
no
.
61
3
050,
is
also
available
from
an
authorized
BMW
dealer
.
FUEL
DELIVERYTESTS
Page 157 of 759
3
.
Observe
fuel
pressure
gauge
after
20
minutes
.
The
pressure
shouldnot
drop
off
more
than
0
.5
bar
from
system
pressure
listed
in
Tablec
.
4
.
When
finished
testing,
disconnect
pressure
gauge
and
reconnect
fuel
line
.
If
the
fuel
system
does
not
maintain
pressure,
check
visual-
¡y
for
leaks
in
fuel
lines
orat
unions
.
Leaks
can
also
be
due
to
a
leaking
injector
or
a
faulty
fuel
pump
check
valve
.
Check
the
pump
check
valve
by
repeating
the
test,
butbefore
turning
the
fuel
pump
off,
pinch
off
theretum
line
at
the
fuel
rail
.
If
the
pressure
is
now
maintained,
the
fault
is
most
likely
the
fuel
pump
check
valva
.
Tabla
c
.
Fuel
Pressure
Specifications
Engine
1
Fuel
pressure
4-cytinder
1
3
.0
t
0
.2
bar
(43
.5
t
2
.9psi)
6-cytinder
M50/S50US
engine
3
.0
t
0
.2
bar
(43
.5
±2
.9psi)
M52/S52US
engine
3
.5
f
0
.2
bar
(51
t
2.9psi)
Fuel
pressure
regulator
response
to
engine
load,
testing
1
.
With
fuel
pressure
gauge
connected,
reinstallfuel
pump
relay
.
Start
engine
and
allow
it
to
idle
.
NOTE-
The
fuel
pressure
should
be
lower
by0
.4-0.7
bar
from
the
specifications
listed
in
Table
c
.
Engine
vacuum
act-
ing
on
the
fuel
pressure
regulator
diaphragm
reduces
the
fuel
pressure
.
2
.
With
engine
idling,
remove
vacuum
hose
from
regula-
tor
.
Pressure
should
increase
.
3
.
Reconnecthose
and
check
that
pressure
decreases
.
4
.
When
finished
testing,
disconnect
pressure
gauge
and
reconnect
fuelline
.
Tighten
hose
clamp
.
0013190
Fig
.
13
.
For
electrical
tests,
4-cytinder
fuel
injector
harnessduct
can
be
If
fuel
pressure
does
not
drop
with
the
vacuum
hose
con-
accessed
between
intake
manifold
and
cytinder
head
cover
.
nected
and
no
faulty
are
found
with
fuel
the
pressure
regulator
vacuum
hose,
the
fuel
pressure
regulator
is
faulty
.
1
.
Check
that
ECM
signal
is
present
atinjector
connector
.
NOTE-
A
cracked
or
leaktng
pressure-regulator
vacuum
hose
may
cause
en
erratic
tdle
.
FUEL
INJECTION
130-
11
Fuel
rail
and
injectors,
checking
The
fuel
injectors
are
switched
on
and
off
(opened
and
closed)
by
the
ECM
.
The
injectors
are
connected
to
a
com-
mon
fuel
supply,
callad
the
fuel
rail
.
The
fuel
injectors
are
removed
by
first
removing
the
com-
plete
fuel
rail
assembly
and
then
unclipping
the
injectors
from
the
fuel
rail
.
CA
UTION-
Use
only
a
digital
multimeter
or
an
LED
injector
tester
when
testing
injectors
or
wiring
.
Use
of
ananalog
VOM
or
incandescent
testlight
may
dam-
age
the
engine
control
module
.
NOTE-
"
On
4-cytindercars
pry
up
the
injector
wiring
duct
and
then
pry
off
the
cover
.
See
Fig
.
13
.
"
On
6-cytinder
cars
it
is
necessary
to
remove
the
top
engine
cover(s)
to
access
the
fuel
rail
and
injectors
.
"
Back
probe
injector
harness
connector
using
digital
voltmeter
.
See
Fig
.
14
.
"
Operate
starter
or
run
engine
and
check
for
pulsad
voltage
signal
.
"
Repeat
for
each
injector
.
NOTE
-
To
quick-check
if
en
injectorfunctioning,
place
a
screw-
driver
or
stethoscope
on
the
injector
with
the
engine
running
.
If
the
injector
is
operating,there
should
been
audible
buzz
.
FUEL
DELIVERYTESTS
Page 170 of 759
130-24
FUEL
INJECTION
Jo
'0
o_A
í1
RELAY
..
.
.
CAMSHAFT
POSITION
SENSOR
'
.
~'
~
:UhI~IIUH~W~`bY~7~d~t~II7
.
.
.
,
1111111
~ilf
ASC
TERMINAL
15
MEMORY
POWER
CRANKSHAFT
POSITION
qtcMSENSOR
THROTTLE
POSITION
ENGINE
COOLANT
TEMP
FUELTANK
PRESSURE
SENSOR
S-EML
S-MSR
S-ASC
VEHICLE
SPEED
LOW
FUEL
LEVEL
A/C
SWITCH
ON
(AC)
E36
IHKA
COMPRESSOR
"ON"
SIGNAL
(KO)
INDIVIDUAL
SERIAL
NUMBER
SIEMENS
MS
41
.
1
COMPONENT
REPLACEMENT
FUEL
PUMP
RELAY
CONTROL
AUX
GROUND
P
MAIN
GROUND
AC
COMPRESSOR
RELAY
CONTROL
~®
SECONDARY
AIR
INJECTION
AIR
PUMP
RELAY
CONTROL
-
M
PRE
CAT
POST
CAT
m
nXYGEN
SENSOR
ys
U
~
4
,
HEATING
FUELINJECTOR
CONTROL
(
MS
41
.1
(
MS
PURGE
CONTROL
VALVE
//
PURGE
'
CANISTERSHUT-OFF
VALVE
ECM
RELAY
CONTROL
IGNITION
COILS
CONTROL
1
ASC
o
ayi
THROTTLE
POTENTIOMETER
POWER
,
al
;
..
i
r71a
.
"a
fn7111,
/
r
Fig
.
36
.
Siemens
MS
41
.1
OBD
II
engine
management
system
usedon
M52
engine
.
Bosch
M5
.2
systemusedon
M44
engine
is
similar
.
Page 175 of 759
Tableh
.
ECM
Pin
Assignment--Bosch
DME
M1
.7
Pin
1
Signal
1
Component/function
1
Signal
45
Notused
46
Notused
47
Notused
48
Output
A/C
compressor
cut-out
Compressor
control
relay,
terminal
85
49
Notused
50
Notused
51
Output
Cyl
.
4
ignition
coil
control
Cyl
.
4
ignition
coil
52
Output
Cyl
.
2
ignition
coil
control
Cyl
.
2
ignition
coil
53
Not
used
54
Input
Battery
voltage
from
engine
control
module
Engine
control
module
relay,
terminal
87a
55
Ground
Ground,
ignition
Ground
point
56
Input
Ignition
switch,
terminal
15
Ignition
switch,
terminal
15
57
Notused
58
Not
used
59
Output
Throttleposition
sensor
and
volume
air
flow
sensor
Reference
voltage
(5
VDC)
60
Input
Programming
voltage
Data
link
connector
61
Notused
62
Notused
63
Notused
64
Input
Ignition
timing
intervention
Transmission
control
module
(EGS)
65
Input
Drive
range
P/N
Automatic
transmission
range
switch
66
Notused
67
Input
Crankshaft
position
RPM
sensor
Crankshaft
position
RPM
sensor
68
Input
Crankshaft
position
RPM
sensor
Crankshaft
position
RPM
sensor
69
Notused
70
Input
Oxygen
sensor
signal
Heated
oxygen
sensor
71
Ground
Oxygen
sensor
signal
ground
Heated
oxygen
sensor
72
Notused
73
Input
Vehicle
speed
signal
Instrument
cluster
74
Output
Engine
speed
signal
Instrument
cluster
75
Not
used
76
Input
Volume
air
flow
sensor
Volume
air
flow
sensor
77
Input
Intake
air
temperature
sensor
(IAT)
Intake
air
temperature
sensor
(IAT)
78
Input
Engine
coolant
temperature
Engine
coolant
temperature
sensor
79
Notused
80
Not
used
81
Input
Drive-away
protection
signal
(code)
On-boardcomputer
82
Not
used
83
Notused
84
Not
used
85
Input
A/C
pressure
Pressure
switch
86
Input
A/C
switch
Integrated
climate
regulation
control
module
87
Output
RxD
diagnosisdata
line
Data
link
connector
88
Output-Input
TxD
diagnosisdata
line
l
Data
link
connector
FUEL
INJECTION
130-
2
9
ECM
PIN
ASSIGNMENTS
Page 177 of 759
Table
i
.
ECM
Pin
Assignment-Bosch
DME
M3
.1
Pin
Signal
Component/function
2
ignal
FUEL
INJECTION
130-
3
1
45
vacant
-
46
vacant
-
-
47
vacant
-
-
48
output
A/C
compressor
control
A/C
compressor
disabled
via
compressor
control
relay
49
vacant
-
-
50
output
Ignition
control
(terminal
1),cyl
.
n
o
.
4
Primary
signal,
ignition
coil
cyl
.
n
o
.
4
51
output
Ignition
control
(terminal
1),cyl
.
n
o
.
6
Primary
signal,
ignition
coil
cyl
.
no
.
6
52
output
Ignition
control
(terminal
1),cyl
.
n
o
.
5
Primary
signal,
ignitioncoil
cyl
.
no
.
5
53
vacant
-
54
input
Power
supply
Battery
voltage
(+)
from
main
relay
terminal
87
55
ground
Ground
Ground
for
ignition
control
56
input
Power
supply
(terminal
15)
Batteryvoltage
(+)
with
key
on
or
engine
running
57
vacant
-
-
58
vacant
-
-
59
output
Throttleposition
sensor
Throttleposition
sensorsupply
voltage
(5
VDC)
60
input
Data
link
connector
Programming
voltage
61
vacant
-
-
62
vacant
-
-
63
vacant
-
-
64
input
Ignition
timing
intervention
from
A/T
control
module
(only
active
during
gearshift)
65
input
Automatic
transmission
(A/T)
range
switch
Transmission
park
or
neutral
signal
66
vacant
-
-
67
input
Engine
speed/crankshaft
position
sensor
Crankshaft
position/rpm
(voltage
(VAC)
between
pins
67
and
68)
68
input
Engine
speed/crankshaft
position
sensor
Crankshaft
position/rpm
(voltage
(VAC)
between
pins
67
and
68)
69
vacant
-
-
70
input
Oxygen
sensor
Oxygen
sensor
signal
(0-1
VDC
fluctuating
with
engine
running)
71
ground
Oxygen
sensor
Oxygen
sensor
signal
ground
72
vacant
-
-
73
input
Road
speed
Road
speed
signal
from
instrument
cluster
74
output
Engine
speed
(TD)
Engine
speed
(TD)
signalto
instrument
cluster
75
vacant
-
-
76
vacant
-
-
77
input
Intakeair
temperature
(IAT)
sensor
Intake
air
temperature
(0-5
V,
temperaturedependent)
78
input
Engine
coolant
temperature
(ECT)
sensor
Engine
coolant
temperature
(0-5V,
temperature
dependent)
79
vacant
-
-
80
vacant
-
-
81
input
On-boardcomputer
Drive-away
protection
enable
82
vacant
-
-
83
vacant
-
-
84
vacant
-
-
85
input
A/C
pressure
switch
From
Integrated
climate
control
module
via
A/C
pressure
switch
86
input
A/C
compressor
on
From
Integrated
climate
control
module
87
input
Diagnostic
connector
(RxD)
Diagnostic
RxD
(receive)signal
to
pin
15
in
Data
link
connector
88
input/output
Diagnostic
connector
(TxD)
Diagnostic
TxD
(transmit)
signal
to
pin
20
in
Data
link
connector
ECM
PIN
ASSIGNMENTS
Page 179 of 759
Table
j.
ECM
Pin
Assignment-Bosch
DME
M3
.3
.1
Pin
~
Signal
1
Componentffunction
1
signal
FUEL
INJECTION
130-
33
45
ground
Ignition
circuit
shield
Ground
shieldfor
ignition
circuit
monitoring
46
output
Fuel
consumption
(KVA
signal)
To
instrument
cluster
47
output
Crankshaft
rpm
Engine
speed
(TD)
signal
to
instrument
cluster
48
output
A/C
compressor
control
A/C
compressor
relay
terminal
85
49
vacant
-
-
50
output
Ignition
coil
control,
cyl
.
1
Primary
signal,
ignition
coil
1
51
output
Ignition
coil
control,
cyl
.
2
Primary
signal,
ignition
coil
2
52
output
Ignition
coil
control,
cyl
.
3
Primary
signal,
ignition
coil
3
53
vacant
-
-
54
input
Power
supply
Battery
voltagefrom
main
relay
(terminal
87a)
55
ground
Ground
Ground
for
ignition
control
56
input
Power
supply
(terminal15)
Batteryvoltage
with
key
on
or
engine
running
57
input
Ignition
timing
intervention
From
A/T
control
module
58
vacant
-
-
59
output
Throttleposition
sensor
(TPS)
Voltage
supply
to
TPS
(5
VDC)
60
input
Programming
voltage
Data
link
connector
61
vacant
-
-
62
vacant
-
-
63
vacant
-
-
64
input
A/C
on
signal
From
integrated
climate
control
module
65
input
A/C
pressure
signal
From
integrated
climate
control
module
via
A/C
pressure
switch
66
input
On-board
computer
Drive-away
protection
enable
(starter
immobilization
relay)
67
vacant
-
-
68
vacant
-
-
69
input
Knock
sensor
#2
(cyl
.
4,5,
6)
Knock
sensor
#2
signal
70
input
Knock
sensor
#1
(cyl
.
1,2,
3)
Knock
sensor
#1
signal
71
ground
Ground
Ground
for
knock
sensors
and
shields
72
vacant
-
-
73
input
Throttleposition
sensor
(TPS)
Throttleposition
signal
74
vacant
-
75
vacant
-
-
76
vacant
-
77
input
Intakeair
temperatura
Intakeair
temperatura
sensor
(0-5
VDC)
78
input
Engine
coolant
temperature
Engine
coolant
temperature
sensor
(0-5
VDC)
79
vacant
-
80
vacant
-
-
81
input
Automatic
transmission
gear
positionlneutral
A/T
parkor
neutral
position
signal
safetyswitch
82
vacant
-
-
83
vacant
-
-
84
vacant
-
-
85
vacant
-
-
86
vacant
-
-
87
input
Diagnostic
connector
(RxD)
Diagnostic
RxD
(receive)
signal
to
pin
15
in
Data
link
connector
88
input/output
Diagnostic
connector
(TxD)
Diagnostic
TxD
(transmit)
signal
to
pin
20
in
Data
link
connector
ECM
PIN
ASSIGNMENTS
Page 182 of 759
130-
3
6
FUEL
INJECTION
Pin
1
Signal
1
Componentffunction
1
Signal
1
output
Ignition
coil
control,
cyl
.
2
Primary
signal,
ignition
coil
2
2
output
Ignition
coil
control,
cyl
.
4
Primary
signal,
ignitioncoil
4
3
output
Ignition
coil
control,
cyl
.
6
Primary
signal,
ignition
coil
6
4
ground
Ground
Ground
5
output
Fuel
injectorcontrol,
cyl
.
2
Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
2
6
output
Fuel
injectorcontrol,
cyl
.
1
Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
1
7
output
Mass
air
flow
meter
Mass
air
meter
signal
8
input
Mass
air
flow
meter
Mass
air
meter
signal
9
output
Instrument
cluster
Fuel
consumption
signal
10
output
Engine
coolant
temperature
(ECT)
sensor
ECT
signal
11
output
Fueltankpressure
sensor
Fueltankpressure
sensor
control
12
input
Throttleposition
sensor
(TPS)
Throttleposition
signal
13
-
14
input
Intake
air
temperature
(IAT)
sensor
Intake
air
temperature
signal
15
Traction
control
AST
module
16
input
Automatic
climate
control
Automatic
climate
control
17
18
input
Electronic
immobilizer
control
(EWS
II)
Electronic
immobilizer
control
(EWS
II)
module
19
Automatic
climate
control
Automatic
climate
control
20
-
Instrument
cluster
Instrument
cluster
21
output
Camshaft
actuator
(VANOS
solenoid)
control
Camshaft
actuator
(VANOS
solenoid),
switched
ground
22
output
Fuel
injectorcontrol,
cyl
.
3
Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
3
23
Fuel
injectorcontrol,
cyl
.
6
Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
6
24
Fuel
injectorcontrol,
cyl
.
4
Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
4
25
output
Oxygen
sensor
heater
control
Oxygen
sensor
heater
ground
26
input
Power
supply
(terminal
30)
Battery
voltage(B+)
at
all
times
27
output
Idle
speed
control
valve
Pulsed
ground-open
signal
(see
also
pin
53)
28
ground
Ground
Ground
29
output
Ignition
coil
control,
cyl
.
1
Primary
signal,
ignition
coíl
1
30
output
Ignition
coil
control,
cyl
.
3
Primary
signal,
ignition
coil
3
31
output
Ignition
coil
control,
cyl
.
5
Primary
signal,
ignition
coil
5
32
ground
Ground
Ground
33
output
Fuel
injector
control,
cyl
.
5
Pulsedground
(injection
pulsewidth
in
ms)
cyl
.
5
34
ground
Ground
Ground
35
output
Secondary
air
injection
Secondary
air
injection
pump
relay
control
36
output
Engine
speed
output
Engine
speed
signal
37
-
38
ground
Knock
sensor
Shielding
for
knock
sensors
39
output
Intake
air
temperature
sensor
(IAT
Sensor)
Voltagesupply
to
IAT
sensor
and
ECT
sensorEngine
coolant
temperature
(ECT)
sensor
40
output
Crankshaft
position
sensor
(Hall
effect)
Crankshaft
position
sensor
control
41
ground
Camshaft
position
(CMP)
sensor
Shielding
for
CMP
sensor
42
output
Throttle
position
sensor
(TPS)
TPS
ground
43
input
Camshaft
position/rpm
sensor
Camshaft
position/rpm
sensor
control
44
output
Throttle
position
sensor
(TPS)
Voltagesupply
to
TPS
(5
VDC)
45
Traction
control
AST
module
46
-
Instrument
cluster
Instrument
cluster
ECM
PIN
ASSIGNMENTS
Table
I.
ECM
Pin
Assignment-Siemens
DME
MS
41
.1
Page 190 of 759
160-
6
FUEL
TANK
AND
FUEL
PUMP
Fig
.
7
.
Fuel
sender
and
pump
assembly
.
To
operate
the
fuel
pump
for
testing
purposes
without
hav-
Fuel
leve¡
sender
(left
side),
ing
to
runthe
engine,
the
fuel
pump
relay
can
be
bypassed
to
removing
and
installing
powerthe
pump
directly
.
The
procedure
for
removing
and
replacing
the
left
side
fuel
To
runthe
fuel
pump,
remove
the
relay
and
connect
the
leve¡
sender
is
similar
tothat
used
for
the
right
side
.
There
is
socket
for
relayterminal
30
to
the
socket
for
relay
terminal
no
.
no
fuel
pump
on
the
left
side
.
87
with
afused
jumper
wire
.
Relay
terminal
identification
is
shown
in
Fig
.
9
.
After
completing
the
tests,
remove
the
jumper
wire
.
FUEL
PUMP
The
electric
fuel
pump
ís
mounted
in
the
fuel
tank
in
tandem
with
the
right
side
fuelleve¡
sender
.
The
fuel
pump
delivers
fuel
at
high
pressure
to
the
fuel
injection
system
.
A
pressure
regulator
maintains
system
pressure
.
The
quantity
of
fuel
sup-
plied
exceeds
demand,
so
excess
fuel
retums
to
the
fuel
tank
via
a
retum
líne
.
See
130
Fuel
Injection
for
more
information
on
system
pressure
and
the
fuel
pressure
regulator
.
NOTE
-
Fuel
pump
removalprocedures
are
given
earlier
under
Fuel
leve¡
sender
(right
side)
and
fuel
pump,
remov-
íng
and
installing
.
Fuel
Pump
Fuse
and
Relay
The
fuel
pump
is
operated
by
a
fuel
pump
relay
located
ín
the
power
distribution
box
.
The
fuel
pump
circuit
is
protected
by
fuse
no
.
18
located
in
the
power
distribution
box
.
See
Fig
8
.
FUEL
PUMP
0013142
Fuel
DM
E
PUMP
main
re
ay
rel
ay
0
aoo
o
~a
aao
ó
Fig
.
8
.
Fuel
pump
relay
location
in
power
distribution
box
.
The
DME
engine
control
module
(ECM)
and
the
DME
main
relay
supply
power
to
the
coi¡
sideof
the
fuel
pump
relay
.
Dur-
ing
starting,
the
fuel
pump
runs
as
long
as
the
ignition
switch
is
in
the
start
position
and
continues
to
run
oncethe
engine
starts
.
If
an
electrical
system
fault
interrupts
power
to
the
fuel
pump,
the
engine
will
notrun
.
Operating
fuel
pump
for
tests
CA
UTION-
Relay
locations
may
vary
.
Use
care
when
identify-
ing
relays
and
when
troubleshooting
the
electrical
system
at
the
fuselrelay
panel
.
The
fuel
pump
re-
¡ay
is
a
four
pin
relay
and
has
a
1.5
mm
2
red
wireat
terminal
30
in
the
relay
socket,
lf
in
doubt,
con-
sult
an
authorized
BMW
dealer
.
NOTE-
Thejumper
wire
shouldbe
1.5
mm2
(14
ga
.)
and
in-
clude
en
in-fine
fuse
holder
with
a16
amp
fuse
.
To
avoid
fuselrelay
panel
damage
fromrepeated
connect-
íng
and
disconnecting,
also
include
a
toggleswitch
.
A
heavy-duty
jumper,
BMW
tool
no
.
613
050,
fs
also
available
from
en
authorized
BMW
dealer
.
0013034,
If
the
pump
does
notrun
with
the
jumper
installed,
the
fault
could
be
in
the
fuel
pump
or
the
wiring
to
the
pump
.
Check
the
pump
and
its
wiring
as
described
below
.