1997 BMW 328i reverse
[x] Cancel search: reversePage 142 of 759
121-
6
BATTERY
STARTER,
ALTERNATOR
Alternator,
removing
and
installing
(6-cylinder
engine)
A
replacement
alternator
should
have
the
same
rating
as
the
original
.
Alternator
manufacturer
and
ampere
rating
are
normally
marked
on
the
alternator
housing
.
1
.
Disconnect
negative
(-)
battery
cable
.
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viii
.
2
.
Remove
alternator
cooling
duct
and
air
filter
housing
assembly
from
car
.
Disconnect
wiring
from
rear
of
alter-
nator
.
3
.
Remove
radiator
cooling
fan
and
fan
shroud
.
See
170
Radiator
and
Cooling
System
.
4
.
Remove
alternator
drive
belt
from
alternator
pulley
.
On
engines
with
hydraulic
belt
tensioner,
remove
tensioner
idler
pulley
(upper
roller)
from
alternator
bracket
.
See
Fig
.
5
.
ALTERNATOR
SERVICE
Fig
.
5
.
Pry
off
cover
from
tensioner
and
then
lever
tensioner
clock-
wise
to
release
belt
tension
.
Remove
upper
roller
(A)
once
belt
ís
removed
.
NOTE-
If
reusing
drive
belt,
mark
direction
of
rotation
on
belt
before
removing
.
5
.
Remove
upper
and
lower
mounting
bolts
and
lift
out
al-
ternator
.
6
.
Installation
is
reverse
of
removal
.
Note
locating
notches
on
tensioner
idler
pulley
(upper
roller)
alternator
brack-
et
when
installing
pulley
.
Tightening
Torques
"
D+
wire
to
alternator
(M6
nut)
.......
7
Nm
(53
in-lb)
"
B+
wireto
alternator
(M8
nut)
.......
13
Nm
(10
ft-Ib)
"
Pulley
to
alternator
(M16
nut)
.......
60
Nm
(44
ft-Ib)
Voltage
regulator,
removing
and
installing
1
.
Disconnect
negative
(-)
cable
from
battery
.
NOTE-
2
.
Remove
alternator
as
described
earlier
.
The
radiator
cooling
fan
nut
(32
mm
wrench)has
left-
hand
threads
.
3
.
Remove
cooling
duct
from
rear
of
alternator
.
See
Fig
.
6
.
Alternator
.
.g-
p~
J
-..
.
Fig
.
6
.
Alternator
assemblyand
related
parts
.
Cooling
duct
0012524
4
.
Remove
voltage
regulator
mounting
screws
and
re-
move
regulator
from
alternator
.
5
.
Installation
is
reverse
of
removal
.
Clean
brush
contact
surfaces
in
alternator
and
check
brush
length
asde-
scribed
later
.
Page 144 of 759
121-
8
BATTERY,
STARTER,
ALTERNATOR
1f
the
solenoid
audibly
cliicks
but
the
motor
does
not
turn,
Starter,
removing
and
installing
switch
on
the
lights
andtum
the
key
to
the
start
position
.
lf
the
(6-cylinder
engine
with
lights
go
out
while
attempting
to
start,
the
battery
cable
may
be
manual
transmission)
loose
or
the
starter
may
have
a
short
circuit
.
If
the
lights
stay
on,the
solenoid
is
most
likely
atfault
.
The
starter
on
a
6-cylinder
car
with
manual
transmission
is
Starter,
removing
and
installing
(4-cylinder
engine)
1
.
Disconnect
negative
(-)
battery
cable
.
1
.
Disconnect
negative
(-)
cable
from
battery
.
CAUTION-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.
2
.
Remove
guide
tube
for
oil
dipstick
.
3
.
Raise
vehicle
.
WARNING
-
Make
sure
the
car
ís
stable
and
wefl
supported
at
all
times
.
Use
a
professional
automotive
lift
or
jack
stands
designed
forthe
purpose
.
A
floor
jack
is
not
adequate
support
.
4
.
Disconnect
wiring
from
starter
.
5
.
Remove
top
and
bottom
starter
bolts
.
Bottom
bolt
must
be
removed
from
below
car
.
Remove
starter
support
bracket,
if
applicable
.
removed
from
below
.
2
.
Raise
vehicle
.
3
.
Remove
reinforcing
cross
bracefromunder
transmís-
sion,
if
applicable
.
4
.
Remove
cover
from
fuel
filter
and
fuel
lines
on
left
side
underneath
car,
if
applicable
.
Detach
fuel
lines
and
har-
ness
connectors
from
retainingbrackets,
as
necessary
5
.
Disconnect
wiring
from
starter
.
6
.
Loosen
andremove
bolts
and
nuts
fastening
starter
to
transmission
bell
housing
and/or
engine
block
.
Remove
starter
supportbracket
.
7
.
Remove
starter
from
below
.
8
.
Check
starter
pinion
gear
and
flywheel
teeth
for
dam-
age
.
9
.
Installation
is
reverse
of
removal
.
6
.
Pull
starter
downward
and
turn
until
solenoid
is
at
top,
Tightening
Torques
then
remove
from
car
.
"
Re¡
nforcing
cross
brace
to
chassis
(M10)
..
...............
42
Nm
(31
ft-Ib)
7
.
>Check
starter
pinion
gear
and
flywheel
teeth
for
dam-
"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-Ib)
age
.
"
Support
bracket
to
starter
(M5
nut)
...
5
Nm
(44
in-lb)
"
Support
bracket
8
.
Installation
is
reverse
of
removal
.
to
engine
block
(M10
bolt)
.........
47
Nm
(35
ft-Ib)
"
Wire
to
terminal
50
(M6
nut)
.........
6
Nm
(53
ín-Ib)
"
Wire
to
terminal
30
(M8
nut)
.........
12
Nm
(9
ft-lb)
Tightening
Torques
"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-lb)
Wire
to
terminal
50
(M6
nut)
........
6
Nm
(53
in-lb)
"
Wire
toterminal
30
(M8
nut)
...
,
..:.
12
Nm
(9
ft-Ib)
STARTER
SERVICE
Page 146 of 759
121-1
O
BATTERY,
STARTER,
ALTERNATOR
9
.
Remove
starter
from
above
.
10
.
Check
starter
pinion
gear
and
flywheel
teeth
for
dam-
age
.
11
.
Installation
is
reverse
of
removal
.
Tightening
Torques
"
tntakemanifold
to
cylinder
head
M7
nut
...
.
................
...
.
15
Nm
(11
ft-Ib)
M8
nut/bolt
.............
.
.
..
...
22
Nm
(16
ft-Ib)
"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-Ib)
"
Support
bracket
to
starter
(M5
nut)
...
5
Nm
(44
in-lb)
"
Support
bracket
to
engine
block
(M10
bolt)
.
.
..
..
...
47
Nm
(35
ft-Ib)
"
Wire
toterminal
50
(M6
nut)
.
..
.....
6
Nm
(53
in-lb)
"
Wire
toterminal
30
(M8
nut)
...
.....
12
Nm
(9
ft-Ib)
Solenoid
switch,
removing
and
installing
1
.
Remove
starter
as
described
above
.
Tightening
Torque
2
.
Remove
cover
from
solenoid
switch
.
"
Field
winding
strap
to
starter
(M8)
...
.
12
Nm
(9
ft-Ib)
3
.
Disconnect
fieid
winding
strap
between
starter
motor
and
solenoid
switch
.
NOTE-
The
condition
of
the
field
winding
strap
is
critical
.
If
it
is
damaged,
bumed
or
partially
melted
through,
a
new
or
rebuilt
starter
motor
is
needed
.
4
.
Remove
solenoidswitch
mounting
screws,
and
sepa-
,
rate
solenoid
from
starter
.
See
Fig
.
12
.
CAUTION-
When
installing
fieid
winding
strap
to
starter,
posi-
tion
it
so
that
it
does
not
contact
the
starter
body
.
STARTER
SERVICE
131~184
Fig
.
12
.
Starter
solenoid
mounting
screws
(arrows)
are
tight
.
Use
en
impact
screwdriver
to
loosen
the
screws
.
5
.
Installation
is
reverse
of
removal
.
Lubricate
solenoid
pistos
with
light
grease
.
Page 153 of 759
ELECTRICAL
CHECKS
AND
COMPONENT
TESTING
Main
relay,
testing
The
main
relay
is
energized
via
the
engine
control
module
and
supplies
plus
(+)
power
to
the
many
of
the
engine
man-
agement
components
and
subsystems,
including
the
fuel
pump
relay
.
If
this
relay
is
faulty,
the
engine
will
not
start
.
1
.
With
ignition
off,
remove
main
relay
.
See
Fig
.
6
.
.
iommooommmoi
~
"""
Fuel
DME
sensor
CA
UTION-
Relay
positions
can
vary
.
Be
sure
to
confirm
relay
position
by
identífyíng
the
wiring
in
the
socket
us-
ingthe
wiring
diagramsfound
at
the
rearof
this
manual
.
0013034)
Fuel
pump
relay,
testing
FUEL
INJECTION
130-
7
87
851186
30
~j
1
.
Remove
fuel
pump
relay
from
its
socket
.
87661
Fig
.
7
.
Check
for
battery
voltage
at
main
relay
terminals
30
and
86
.
Voltage
should
be
present
at
all
times
.
4
.
With
ignition
on
and
relay
installed,
check
for
battery
voltage
at
terminals
87
.
"
If
battery
voltage
is
present,relay
has
energized
and
is
functioningcorrectly
.
"
lf
battery
voltage
is
not
present
and
al¡
earlier
tests
are
OK,
relay
is
faulty
and
should
be
replaced
.
Fig
.
6
.
Engine
management
relays
in
the
power
distribution
box,
left
rear
of
engine
compartment
.
The
fuel
pump
relay
is
located
in
the
power
distribution
box
.
Refer
to
Fig
.
6
.
The
ECM
supplies
power
to
the
coil
side
of
the
fuel
pump
re-
lay
.
During
starting,
the
fuel
pump
runs
as
long
as
the
ignition
switch
isin
the
start
position
and
continues
to
run
once
theen-
gine
starts
.
If
the
relay
ís
faulty
the
fuel
pump
will
notrun
.
2
.
Check
for
voltage
at
terminal
30
and
terminal
86
of
re-
¡ay
socket
.
See
Fig
.
7
.
2
.
With
key
off,
check
for
batteryvoltage
at
socket
terminal
"
If
battery
voltage
is
present
continue
testing
30
.
See
Fig
.
8
.
"
lf
battery
voltage
is
not
present
at
either
point,
check
large
red
wire
in
relay
socket
.
See
Electrical
Wiring
3
.
With
ignition
key
in
start
position
check
for
battery
volt-
Diagrams
.
age
at
terminal
86
.
NOTE-
4
.
With
ignition
key,
use
digital
multimeter
to
check
for
The
wiring
to
terminals
85
and
86
in
the
main
relay
may
ground
at
terminal
85
.
be
reversed
.
Electrically,
the
relay
functions
either
way
.
lf
voltage
ís
not
present
at
terminal
86,
check
for
volt-
NOTE-
age
at
terminal
85
.
The
ground
atterminal
85
is
switched
by
the
ECM
.
The
ECM
hamess
must
be
connected
to
check
the
3
.
Reinstall
relay
and
turn
ignition
on
.
Gainaccess
to
un-
switched
ground
connection
.
derside
of
relay
socket
and
check
for
ground
at
terminal
85
(brown
wire)
.
5
.
If
no
faults
are
found
up
tothis
point,
testfuel
pump
op-
"
lf
ground
is
present
continue
testing
.
eration
as
described
in
160
Fuel
Tank
and
Fuel
Pump
.
"
If
ground
is
not
present,
signal
from
ECM
is
missing
.
Check
wire
between
ECM
and
relay
.
If
no
faults
can
be
found,
ECM
may
be
faulty
.
ELECTRICAL
CHECKS
AND
COMPONENT
TESTING
Page 159 of 759
6
.
Remove
fuel
rail
mounting
bolts
.
See
Fig
.
17
.
0012504
Fig
.
17
.
Location
of
fuel
rail
mounting
bolts
(A)
and
fuel
inlet
and
return
lines
(B)
on
M44
engine
.
Upper
manifold
has
been
removed
.
7
.
Pull
upon
fuel
rail
and
remove
injector
rail
with
injec-tors
.
Remove
individualinjectors
by
removing
injector
retaining
clip
and
pullinginjector
from
rail
.
See
Fig
.
18
.
Fig
.
18
.
Pry
retaining
clip
from
injector
(1),
then
pull
injector
from
rail
(2)
.
8
.
Installation
is
reverse
of
removal
.
Tightening
Torque
"
Fuel
rail
to
cylinder
head
..
.
..
..
...
10
Nm
(89
in-lb)
FUEL
INJECTION
130-
1
3
Fuel
Pressure
Regulator
The
fuel
pressure
regulator
location
on
E36
models
is
mounted
in
one
of
two
locations
:
Fuel
Pressure
Regulator
Location
"
4-cylinder
engines
1992-
January
1997
............
...
..
on
fuel
rail
January
1997-
on
...............
..
...
under
car
"
6-cylinderengines
1992-1995
.
.
...
...
.
...........
...
..
on
fuel
rail
1996-on
..
.
..
................
...
...
undercar
Fuel
pressure
regulator,
replacing
(fuel
rail
mount)
WARNING
-
Fuel
will
be
discharged
.
Do
not
disconnect
any
wires
that
could
cause
electrícal
sparks
.
Do
not
smoke
or
work
near
heaters
or
other
fire
hazards
.
Keepan
approved
fire
extinguisher
handy
.
9
.
On
6-cylinder
engines,
remove
top
engine
covers
.
Re-
move
fuel
rail
mounting
bolts
and
lift
up
fuel
rail
.
1
.
Disconnect
vacuum
hose
from
fuel
pressure
regulator
.
See
Fig
.
19
.
"
Fit
new
O-rings
when
installing
injectors
.
For
ease
of
installation,
lightly
lubricate
O-rings
with
SAE
90
or
0012732
equivalent
lubricant
.
Fig
.
19
.
Fuel
pressure
regulator
(arrow)
on
M42
engine
.
Vacuum
hose
"
Check
that
injector
electrical
connections
are
correctly
shown
at
A
.
fitted
and
that
injectors
are
fully
seated
prior
to
install-
ing
fuel
rail
mounting
bolts
.
2
.
Remove
bolt
from
regulator
clamp
.
Remove
clamp
.
Note
"
Replace
wire
ties
.
installed
direction
of
regulator
to
fuel
rail
.
3
.
Wrap
a
shop
rag
around
regulator,
then
remove
regula-
tor
from
fuel
rail
by
pulling
straight
out
.
FUELDELIVERYTESTS
Page 160 of 759
130-
1
4
FUEL
INJECTION
NOTE-
Be
sure
to
retrieve
thrust
washer
behind
fuel
pressure
regulator
on
6-cylinder
engine
.
4
.
Installation
is
reverse
of
removal
.
Replace
O-rings
.
Fuel
pressure
regulator,
replacing
(under
car
mount)
WARNING
-
Fuel
will
be
discharged
.
Do
not
disconnect
any
wires
that
could
cause
electrical
sparks
.
Do
not
smoke
or
work
near
heaters
or
other
fire
hazards
.
Keep
an
approved
tire
extinguisher
handy
.
On
late
4-
and
6-cylinder
cars,
the
fuel
pressure
regulator
is
mounted
beneath
the
left
sideof
the
car,
under
a
protective
cover
.
See
Fig
.
20
.
0012726
Fig
.
20
.
Fuel
pressure
regulatorlocation
underneath
car
(arrow)
.
Vac-
uum
hose
to
regulator
is
shown
at
A
.
(Protective
cover
has
been
removed
.)
5
.
Installation
is
reverse
of
removal
.
Replace
O-rings
.
BOSCH
DME
Ml
.
7
COMPONENT
TESTS
AND
REPAIRS
BOSCH
DME
Ml
.7
COMPONENT
TESTS
AND
REPAIRS
CA
UTION-
Use
only
a
digital
multimeter
when
testing
compo-
nents
and
wiring
.
Use
of
an
analog
VOM
may
damage
the
engine
control
module
.
4-cylinder
cars
with
M42
engines(1992
to
1995)use
the
Bosch
DME
M1
.7
fuel
injection
system
.
Electrical
tests
of
the
main
and
fuel
pump
relays
and
the
DME
engine
control
module
(ECM)
are
covered
earlier
in
this
section
.
Fuel
pump
tests
arecovered
in
160
Fuel
Tank
and
Fuel
Pump
.
Air
flow
sensor,
testing
and
replacing
DME
M1
.7
fuel
injection
uses
a
volume
air
flow
type
sensor
with
integrated
intake
air
temperature
(IAT)
sensor
.
The
sen-
sor
provides
a
varyingvoltage
signal
to
the
ECM
based
on
the
position
of
the
air
vane
.
As
the
vane
doorswings
open
thepo-
tentiometer
increases
the
voltage
signal
to
the
ECM
.
The
IATsensor
adapts
theoutput
signal
to
the
ECM
based
on
intake
air
temperature
.
1
.
Check
ECM
reference
voltage
to
sensor
:
"
Peel
back
rubber
boot
from
air
flow
sensor
harness
connector
.
"
Turn
ignition
keyon
.
"
Check
for
5
volts
between
terminal
1
of
harness
con-
nector
and
ground
.
See
Fig
.
21
.
"
Turn
ignition
key
off
.
"
If
voltage
is
not
present
or
incorrect,
check
wring
from
ECM
and
check
air
flow
sensor
reference
voltage
out-
put
at
ECM
.
See
Table
h
.
1
.
Working
under
car
below
driver's
seat,
remove
protec-
tive
cover
from
below
fuel
pressure
regulator
.
"
Remove
intake
air
bootfrom
sensor
.
2
.
Remove
vacuum
hosefrom
fuel
pressure
regulator
.
"
Connect
a
digital
multimeter
(ohms)
across
terminais
1
and
2
.
Swing
air
flow
sensor
vane
through
its
travel
3
.
Remove
locking
clip
retaining
fuel
pressure
regulator
.
range
.
Resistance
should
change
steadily
without
in-
terruption
.
4
.
Wrap
a
shop
rag
around
regulator,
then
remove
regula-
"
If
any
faults
are
found,
the
air
flow
sensor
is
faulty
and
tor
from
213
way
valve
by
pullingstraight
out
.
should
be
replaced
.
2
.
Check
air
flow
sensor
potentiometer
:
3
.
Check
IAT
sensor
resistance
:
"
With
harness
connector
disconnected
at
air
flow
sen-
sor,
check
resistance
across
sensor
terminais
4
and
5
of
air
flow
sensor
.
Compare
tests
results
to
values
in
Table
d
given
later
.
If
any
faults
are
found,
the
air
flow
sensor
should
be
replaced
.
Page 167 of 759
NOTE-
NOTE-
"
The
Ole
speed
control
valve
signal
can
be
checked
The
intake
manifold
is
held
in
place
with
7
nuts
from
using
a
duty
cycle
meter
(or
dwellmeter)
.
Connect
the
above
and
2
support
bracket
bolts
from
undemeath
.
On
meter
to
the
valve
following
the
manufacturer's
in-
DME
3
.1
cars,
carefully
disconnect
the
idleair
hose
from
structions
.
Turn
on
the
WC
or
create
a
larga
air
leak
theintake
manifold
when
lifting
the
manifold
off
.
For
more
and
check
that
the
meter
reading
reacts
while
the
idle
information,
sea
113
Cylinder
HeadRemovaland
In-
speed
remainssteady
.
stallation
.
"
There
are
some
additional
inputs
to
the
control
mod-
ule
that
affect
idle
speed
(Le
.
throttle
position,
AIC-on
5
.
Disconnect
al¡
necessary
hoses
andremove
idle
speed
signals,
andAIT
Drive
position)
.
Check
these
signals
control
valve
.
if
idle
problems
persist
.
See
Tabla
i
orTable
j
.
Idle
speed
control
valva,
replacing
The
idle
speed
control
valve
is
mounted
beneath
the
intake
manifold
.
Accessing
the
valva
is
best
accomplishedby
first
re-
moving
the
intake
manifold
.
NOTE-
¡tis
recommended
that
the
intake
manifold
gaskets
be
replaced
whenever
the
intake
manifold
is
removed
.
1
.
Remove
top
enginecovers
from
engine
.
See
Fig
.
31
.
FUEL
INJECTION
130-21
6
.
Installation
is
reverse
of
Removal
.
Use
new
gaskets
when
installing
intake
manifold
.
NOTE-
Poor
driveability
may
be
noticed
afterinstalling
a
re-
placement
idle
speed
control
valve
.
After
about
10
min-
utes
of
driving,
the
system
will
adapt
the
base
setting
of
the
valva
and
the
idle
speed
should
retum
to
normal
.
Tightening
Torque
"
Intakemanifold
to
cylinder
head
(M7)
........
..
.
15±2
Nm
(11
ti
ft-Ib)
BOSCH
DME
M5
.2
COMPONENT
REPLACEMENT
On-Board
Diagnostics
11
(OBD
II)
is
incorporated
into
the
Bosch
DME
M5
.2
engine
management
systems
used
on
the
M44
engine
.
OBD
II
is
capable
of
detecting
a
full
range
of
faults
.
When
faults
are
detected,
a
Diagnostic
Trouble
Code
(DTC)
is
stored
in
the
system
ECM
.
The
Check
Engine
warn-
ing
light
will
also
come
on
if
an
emissions-relatad
fault
is
de-
tected
.
The
most
efficient
way
to
diagnose
the
Bosch
OBD
II
sys-
tem
is
by
using
a
specialized
scan
tool
.
The
OBD
II
system
is
capable
of
storing
hundreds
of
faults,
making
diagnostics
with
a
scan
tool
the
only
viable
method
.
Therefore,
system
diag-
nostics
is
not
covered
here
.
Fi
31
.
Remove
to
en
ine
covers
b
in
out
caPs
and
removin
NOTE-
nuts
(A)
9
.
P
g
y
Pry
g
g
"
The
OBD
11
fault
memory
(including
an
iiluminated
Note
14
L-te
at
cover
edge
(arrows)
.
Check
Engine
light)
can
only
be
reset
using
the
spe-
cial
scan
tool
.
Removing
the
connector
from
the
ECM
2
.
Remove
two
hold
down
nuts
from
fuel
injector
wiring
or
disconnecting
the
battery
will
not
arase
the
fault
duct
.
Pry
back
injector
connector
retainers
and
lift
off
memory
.
wiring
duct
.
"
The
16-pin
OBD
Il
diagnostic
connector
is
located
on
the
lower
left
dash
panel
.
Refer
to
Fig
.
1
.
3
.
Disconnect
intake
air
bootfrom
throttle
housing
.
Where
applicable
disconnect
accelerator
cable
and
cruise
"
BMW
special
scan
tool
ora
`generic"OBD
II
scan
tool
control
cable
from
their
brackets
.
must
be
used
to
access
DTCs
.
4
.
Unbolt
intake
manifold
and
move
it
out
of
way
enough
to
access
idle
speed
control
valva
.
"
Tablak
lists
engine
control
module
(ECM)
pinouts
for
the
DMEM5
.2
system
BOSCH
DME
M5
.
2
COMPONENT
REPLACEMENT
Page 168 of 759
130-
2
2
FUEL
INJECTION
Mass
air
flow
sensor,
replacing
1
.
Disconnect
harness
connector
and
intake
air
bootfrom
air
flow
sensor
.
See
Fig
.
32
.
Fig
.
32
.
To
detach
air
flow
sensor,
disconnect
harness
connector
(A)
;
3
.
Installation
is
reverse
of
removal
.
unclip
retainíng
clips
to
aír
filter
housing
(B)
;
andremove
large
hose
clamp
at
air
intake
bellows
(C)
.
M44
engine
with
traction
"
Use
a
new
copper
sealing
washer
when
installing
sen-
control
shown
.
sor
.
"
Replace
any
lost
coolant
.
2
.
Detachtwo
large
clipsat
air
filter
housing
and
work
air
flow
sensor
out
of
rubber
seal
in
filter
housing
.
Tightening
Torque
3
.
Installation
is
reverse
of
removal
.
"
Engine
coolant
temperature
"
For
ease
of
installation,
lubricate
large
rubber
seal
in
to
cylinder
head
.............
.
..
.
13
Nm
(10
ft-Ib)
air
filter
housing
with
silicone
lubricant
or
equivalent
.
"
No
adjustment
to
air
flow
sensor
is
possible
.
"
Carefully
check
that
all
hoses
and
seals
are
seated
Intake
air
temperature
(IAT)
sensor,
properly
.
replacing
Engine
coolant
temperature
(ECT)
sensor,
replacing
The
engine
coolant
temperature
(ECT)sensor
is
a
dual
temperature
sensor
.
One
circuít
provides
coolant
temperature
information
to
the
ECM
while
the
other
circuít
provides
coolant
temperature
information
to
the
instrument
cluster
.
WARNING
-
Do
not
replace
the
ECT
sensor
unless
the
engine
is
cold
.
Hot
coolant
can
scald
.
1
.
Disconnect
harness
connector
from
ECT
sensor
.
See
Fig
.
33
.
2
.
Unscrew
temperature
sensorfrom
cylinder
head
and
remove
BOSCH
DME
M5
.2
COMPONENT
REPLACEMENT
U1111
bis4a
Fig
.
33
.
M44
engine
coolant
temperature
(ECT)
sensor
located
above
oil
filter
(arrow)
.
The
intake
air
temperature
(IAT)
sensoron
cars
with
M44
engine
is
mounted
in
thetop
section
of
the
intake
air
filter
housing
.
See
Fig
.
34
.
1
.
Remove
electrical
harness
connector
from
IAT
sensor
.
2
.
Unclip
temperature
sensor
and
remove
from
air
filter
housing
.
3
.
Installation
is
reverse
of
removal
.
Throttle
position
sensor
(TPS),
replacing
The
throttle
position
sensor
is
located
on
the
side
of
the
throttle
housing
.
See
Fig
.
35
.
1
.
Unplug
harness
connector
from
sensor
.