1998 BMW M3 Timing

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

170-10



RADIATOR
AND
COOLING
SYSTEM

Coolant
pump,
replacing

The
engine
coolant
pump
is
mounted
in
the
frontof
the
en-

gine
on
the
timing
cover
.
See
Fig
.
16
.

Fig
.
16
.
Coolant
pump
mounted
on
timing
cover
.

NOTE-

Onlyreplacement
coolant
pumps
with
metal
¡mpellers
should
be
installed
.
Pumps
with
plastic
impellers
should
not
be
used
.

1.
Drain
cooling
system
as
described
earlier
.

0013197

WARNING
-

Allow
cool¡ng
system
to
cool
before
open¡ngor
drain¡ng
system
.

2
.
Remove
primary
cooling
fan
shroud
and
cooling
fan
(belt-driven
or
electric)
as
described
earlier
.

Fig
.
17
.
Engine
drive
belt
tensioner
being
released
on
M44
engine
.
Pry
off
tensioner
cover
and
then
lever
tensioner
in
counterciock-
wise
direction
(as
facing
engine)
and
slip
belt
off
pulleys
.

Fig
.
18
.
Drive
belt
tensioner
being
released
on
M52
engine
.
Pry
off
3
.
Disconnect
hoses
from
thermostat
housing
.
Unbolt



tensioner
cover
and
then
lever
tensioner
clockwise
(as
facing
thermostat
housing
from
front
of
cylinder
head
.



engine)torelease
belt
tension
.

4
.
Remove
coolant
pump
drive
belt
.
See
Fig
.
17
or
Fig
.
18
.

NOTE-

-
Mark
direction
of
drive
belt
rotation
if
reusing
belt
.



"
The
6-cylinder
coolant
pump
¡s
mounted
on
studs
and
retained
by
nuts
.
"
Severa¡
drive
belt
and
tensioner
configurations
havebeenused
in
E36
models
.
Refer
to
020
Maintenance
Program
and
640
Heating
and
Air
Conditioning
.

5
.
Remove
coolant
pump
pulley
from
pump
.

6
.
Remove
mounting
fasteners
from
pump
.

COOLING
SYSTEM
SERVICE

NOTE-

"
The
4-cylinder
coolant
pump
¡s
mounted
us¡ng
two
dif-
terent
length
bolts
.
Note
where
thelonger
bolt
fits
dur-
ing
disassembly
.

0011989

7
.
Insert
twoscrews
(M6)
in
tapped
bores
and
tighten
uni-
formly
until
pump
is
free
from
timing
chain
cover
.
See
Fig
.
19
.

Fig
.
19
.
Coolant
pump
being
removed
.
Thread
two
M6
bolts
(arrows)
in
evenly
to
withdraw
pump
.
(Thermostat
and
hoseshavebeen
removed
tor
visual
access
.)

8
.
Installation
is
reverse
of
removal
.

"
Be
sure
to
replace
O-ring
and
gaskets
.

"
Coat
O-ring
with
lubricant
during
installation
.

Tightening
Torque

"
Coolant
pump
to
timing
chaincover

M6
...
.
...................
..
.
.
10
Nm
(89
in-lb)

M8
.
..
.
....................
.
.
.
22
Nm
(17
ft-Ib)

"
Coolant
pump
pulley

to
coolant
pump
.................
10
Nm
(89
in-lb)

RADIATOR
SERVICE

Radiator,
removing
and
installing

1
.
Drain
radiator
as
described
earlier
.

WARNING
-

Allow
cooling
system
to
cool
before
opening
ordraining
system
.

2
.
Remove
primary
cooling
fan
(belt-driven
or
electric)
as

described
earlier
.

3
.
Disconnect
coolingfan
and
leve¡
sensor
harness
con-

nectors
from
bottom
of
radiator,
where
applicable

4
.
Disconnect
harness
connector
from
auxiliary
fandual

temperature
switch
.
See
Fig
.
20
.

5
.
Disconnect
all
coolant
hoses
from
radiator
.

RADIATOR
AND
COOLING
SYSTEM



170-11

0012500

Fig
.
20
.
Cooling
fan
dual
temperatura
switch
(arrow)
on
right
sido
of
radiator
.

6
.
Where
applicable,
disconnectautomatic
transmission
fluid
(ATF)
cooler
lines
from
radiator
.
See
Fig
.
21
.

Fig
.
21
.
Automatic
transmission
fluid
(ATF)
linos
at
radiator
.

7
.
Carefully
pryout
radiator
retaining
clips
from
top
of
ra-

diator
.
See
Fig
.
22
.

8
.
Pul¡
radiator
up
and
out
of
car
.

NOTE-

The
radiator
rests
ontwo
rubber
mounts
.
Check
that

the
mounts
do
not
stick
to
the
bottomof
the
radiator
.

RADIATOR
SERVICE

NOTE-

The
traction
control
system
referred
to
as
AST
(all
sea-
son
traction)
may
also
be
referred
to
as
ASC
(Automat-
ic
Stability
Control)
and
ASC+T
(Automatic
Stability
Control+Traction)
.

The
AST
system
improves
traction
by
electronically
apply-

ing
the
rear
brakes
when
therear
drive
wheels
are
spinning
at

a
faster
rate
than
the
front
wheels
.
The
combined
ABS/AST

control
module,
operating
through
the
ABS
hydraulic
control

unit,
modulates
braking
force
at
therear
wheels
.

In
addition,
AST
uses
retarded
ignition
timing
and
an
auxil-iary
engine
throttle
plate
to
reduceengine
torque
and
maintain

vehicle
stability
.

The
auxiliary
throttle
plate
is
held
open
by
spring
pressure
.

The
AST
system
actívates
the
auxiliary
throttie
position
motor

(ADS)
to
cose
the
AST
throttle
as
needed
.
This
reduces
the

volume
of
engine
intake
air
.
Due
to
the
throttle
closing
very
rapidly
during
AST
operationthe
driver
cannot
increase
theengine
power
output
regardless
of
how
far
theaccelerator
pedal
is
pushed
to
the
floor
.

The
auxiliary
throttle
plate
is
placed
ahead
of
the
conven-

tional
throttle
plate
in
the
throttle
body
.

Traction
control
also
comes
into
operationduringdecelera-
tion
.
Decelerating
on
snowy
or
icy
road
surfaces
can
lead
to
rear
wheel
slip
.
If
a
rear
wheel
startsto
drag
or
lock
up
when

the
throttle
is
closed
rapidly
orduringdownshifting,the
AST
system
can
limit
the
problem
by
advancing
the
ignition
timing
.

A
switch
on
the
center
console
is
used
to
togglethe
AST
on

or
off
.

The
AST
system
is
designed
to
be
maintenance
free
.
There

are
no
adjustments
that
can
be
made
.
Repair
and
trouble-
shooting
of
the
AST
system
requires
special
test
equipment

andknowledgeand
should
be
performed
only
by
an
autho-

rized
BMW
dealer
.
Table
a
lists
theconditions
indicated
by

the
AST
indicator
light
in
the
instrument
cluster

SUSPENSION,
STEERING
AND
BRAKES-GENERAL



300-5

Tablea
.
AST
Indicator
Lamp
Function

Indicator
lamp



1
Condition



1
Comment

Light
on



Normal
AST
start-



Automatic
AST
up



self-test

Light
off



AST
monitoring



Automatic
AST
op-
mode



eration

Press
AST
button,



AST
off
(disabled)



Rocking
the
car
tolight
comes
on



getout
of
snow
or
other
loose
surface
Driving
with
snow
chains

Press
AST
button
:



AST
monitoring



Automatic
AST
op-
light
goes
out



I
mode



eration

Light
flashes



AST
active
mode



I
Normal
AST
oper-
ation
as
it
controls
wheel
speed

Light
stays
on
af-



Defect
in
AST



Consult
BMW
ter
start
up
or



dealer
for
diagno-
comes
on
while



sis/repair
driving



(Vehicle
operation
remains
normal)

WARNING
-

Even
a
car
with
AST
is
subject
to
the
normal
physi-
cal
laws
.
Avoid
excessive
speeds
for
the
road
con-
ditions
encountered
.

CAUTION-
"
If
the
tires
on
the
carare
of
different
makes,
the
AST
system
may
over-react
.
Only
fit
tires
of
the
same
make
and
tread
pattem,

"In
adverse
conditions,
such
as
trying
to
rock
the
car
outof
deep
snow
or
another
soft
surface,
or
when
snow
chainsare
fitted,
it
is
advisable
to
switch
off
AST
and
allow
the
cars
driveline
to
op-
erate
conventionally
.

INTEGRATED
SYSTEMS

ELE-74
ELECTRICAL
WIRING
DIAGRAMS

8727
7

IGNITION
SWITCH

in
RED
BATTERY
ECM
1'27
BRN
RLYCgXL
DI87
'WHT/VEL



WHT/VEL

TXDI88
WHT/VIO



WHTIVIO



'~



/
GRN/VIO

FPRLYCTRL
I
/



BRNIGRN



GRNVIO
023HTRCTRLI
37



BRN/GRN



BRNGRN
COMPUTER
WHT/VEL



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RED/WHT
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gl



BLKIVIO



ANTI-



DATA
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WHT/VIO



RED
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DRIVE
AWAYSIG
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{



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W/EGS



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WHT
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A/C
BLK/BLU



BLK
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I



VEL



SYSTEM



VEL023SIGNAL
I



70
71
BLK



SILK
02S
SIG
GND
I



4z



-
A/C
COMP
CUT
148
BLK/BLU



SLKIBLU



WHTIBLK

DKVPOTSIGI
//
BRN/ORG
fia
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BR/GRV
IGNTIMING
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BRN/BLK
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DRIV
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CVL4IGNCOIL
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CVLSIGNCOILIl62
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FUEL
INJECTION
VALVES

Engine
Management
1993-951
.8L
(1
of
2)

FRONTPOWERD_IS_TRI_BU_TIO_NBOX



_
______
I



ENGINE
CO
NTROL
MODULE
RELAY



FUEL
PUMP
RELAY

-~
I



I
CVL1



DVL2



CVL3



CYL4



A/T
RANGE



TRANSMISSIONCONTROLMODULE
(EGS)
SWITCH

87200

ml
1
G312

GRN/VI
O

BRN/GRN

RED
RED

SPLI_E
--

FRONT
POWER
DISTRIBUTION
BOX

I



OXYGENSENSORRELAY
I

~
RED/WHT
RED/WHT
/I\
RED/WHT

W/OEGS

Engine
Management

1993-95
2
.5L
(2
of
2)

ELECTRICAL
WIRING
DIAGRAMS
ELE-77

HEATEDOXVGEN
CRANKSHAFT
CYL1-3
CYL4-6
SENSOR
POSITION(
KNOCK
KNOCK
-



RPM
SENSOR



SENSOR



SENSOR

W/
E..



I



I



I



INSTRUMENT
WHT/BLKCLUSTER



ELK



I
/



BLKK/B~SVBITEM



VIOIGRY
64
I
B
IAICSWITCH
AIC
COMPCTRL
WHT/BLK
46
I
BRNIORG
11
IFUELCONS
BRN/GRV
37



I7
VALVEPOS
BLK
47
I
IGN
TIMING
WHT/VIO
88ICRNKSHFTRPM

W
ITXDDATA
HT/VEL87
H



IR%DDATA
COMP
I
U^



WT/VIO
vc



I
WHT/VEL
0

INTAKE
AIR



THROTTLE
TEMPERATURE
POSITION
SENSORSENSOR

nFffi

BRNIORG
26
ISHEILDGROUND
BLK
40
I02SSIGGND
VEL



13,
102S
SIGNAL
W/EGS



ANTI-THEFT



GRN
ORBLKlV10



66



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DRIVE-AWAY
SIG

1



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!



~~J
_
______
___------------
TRANSMISSION_
CONTROL



AUTOMATICTRANSMISSION



G117
MODULE
(EGS)



RANGESWITCH

ENGINE
COOLANT



HGTIN
RUN
TEMPERATURE

TEA'

IA
SENSOR
r
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TEA'
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INSTRUMENT
23
1
.



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CHECK
I
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BRN44,
BRN/BLK
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PRESSURESWI7CH



BLK/GRY
65
A/C
PRESS
SIG

HALL
EFFECT
CAMSNAFTSENSOR

ELE-96
ELECTRICAL
WIRING
DIAGRAMS

DATA
LINK
CONNECTOR

WHT/1110
COMPUTER
DATA
~~
LINES
SYSTEM



W
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7VEL
~~
1

6



GRV/B
RN
EGS
WARNING
LP
I~
I_
_
__
HT
S
1K
FUELCONSUMPTION
21
W

INSTRUMENTCLUSTER
X16

BRN
-
1
VIO
SHIFT
LK
SOL
VEL/BLU



BRN
AUTOMODE
SIG



~,3

4
BR
1
N/GRV



G123
4-
IG
TIMING
IN
T
VALVE1
LIGHTS
BLU/RED



DR



ORG
5
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7



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GRY'
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8
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I
I
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PDSENSSHD



16
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r



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I
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~



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19
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N
GND



I
I



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I



SOLENOID
OUTPUTSPD(+)
20V
EL



T



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1BLK/BLU~-



-



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7



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22
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NOA
OILTPSIG(+)



BRN



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3
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OIL
GRRNGSIGLI



"



TEMPERATURE
4



I
BRNI
RxDDATALK
~6WHT/VEL



1



BLK



3I



NCA



S
ENSOR
6
BRN/BLK



G200
-



I



CLR



4



NCAGR
RNG
SIG
L2



1
,27



I
xIiS21
SPEED
1



I
~~
NCASENSOR
BATTERY
VOLT



B
RED



YE
L



1
FAULTINDBIG



9GRV/B
RN



-v



BLK
2



NLA
0
GRV/VEL
3
ICK-DO
W
N
SIG
1
VEL/WH7



"511



TRANSMISSION
WHT/
BLK

Transmission
Electronics

1992
3181,
318is,
3251
&
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Transmission
Electronics

1993-94
318i,
318iC
&
318is

HOTINRUN



HOT
IN
RUN



HOT
INADDY,
RUNHOTATALL



&START&START&START
TIMES



~-
-



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FRONTPOWER
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CONTROLS
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