1995 BMW 318i Temperature sensor

001ía4
i

Fig
.
34
.
Intake
air
temperature
(IAT)
sensor
in
top
section
of
air
filter
housing
.

¡die
speed
control
valve,
replacing

side
of
the
throttle
body
.
See
Fig
.
35
.

1
.
Disconnect
harness
connector
from
¡die
valve
.

0012725

Fig
.
35
.
M44
engine
:
Throttle
housing
showing
(A)
throttle
position
sensor
(fPS)
and
(B)
¡die
speed
control
valve
.

2
.
Remove
twomountingscrews
holding
sensor
to
throttle

housing
.

The
¡die
speed
valve
on
the
M44
engine
is
located
on
the

FUEL
INJECTION



130-23

2
.
Disconnect
vacuum
hose
and
retaining
screws
.

3
.
Pull
¡die
speed
control
valve
from
its
fittings
.

4
.
Installation
is
reverse
of
rémoval
.
Always
replace
0-

rings
and
seals
.

NOTE

Poor
driveability
may
be
notíced
after
installing
a
re-
placement
¡dio
control
valve
.
After
about10
minutes
of
driving,
the
idie
speed
should
retum
to
normal
.

SIEMENS
MS
41
.1

COMPONENT
REPLACEMENT

On-Board
Diagnostics
II
(OBD
II)
is
incorporated
into
the
Si-

emens
MS
41
.1
engine
management
systems
used
in
the

M52
and
S52US
engine
.
Refer
to
Fig
.
36
.

OBD
11
is
capable
of
detecting
a
fui¡
range
offaults
.
When

faults
are
detected,
a
Diagnostic
Trouble
Code
(DTC)
is

stored
in
the
system
ECM
.
The
Check
Engine
warning
light
will
also
come
on
if
an
emissions-related
fault
is
detected
.
The

most
efficient
way
to
diagnose
the
Siemens
OBD
II
system
is

by
using
a
specialized
scan
tool
.
The
OBD
II
system
is
capa-

ble
of
storing
hundreds
of
faults,
making
diagnostics
with
a
scan
tool
the
only
viable
method
.
Therefore,
system
diagnos-

tics
is
not
covered
here
.

NOTE
-

"
The
OBD
11
fault
memory
(including
an
illuminated

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
.

"
The
16-pin
OBD
11
diagnostic
connector
is
located
on

the
lower
left
dash
panel
.
Refer
to
Fig
.
1
.

"
BMW
special
scan
tool
ora
"generic"
OBD
11scan
tool

must
be
used
to
access
DTCs
.
3
.
Installation
is
reverse
of
removal
.
No
adjustment
is
nec
essary
.



"
Table
1
lists
engine
control
module
(ECM)
pinouts
forthe
MS
41
.1
systems
.

SIEMENS
MS
41
.
1
COMPONENT
REPLACEMENT

Mass
air
flow
sensor,
replacing

1
.
Disconnect
harness
connector
and
intake
air
boots

from
air
flow
sensor
.
See
Fig
.
37
.

Fig
.
37
.
Mass
air
flow
sensor
(arrow)
on
M52
engine
.

2
.
Installation
is
reverse
of
removal
.

"
No
adjustment
to
aír
flow
sensor
is
possible
.

"
Check
intake
hoses
for
cracks
and
vacuum
leaks
.

Engine
coolant
temperature(ECT)
sensor,

replacing

The
ECT
sensor
is
a
dual
temperature
sensor
.
One
circuit

provides
coolant
temperature
information
to
the
ECM
while

the
other
circuit
provides
coolant
temperature
information
to

the
instrument
cluster
.

1
.
Remove
left-side
top
engine
cover
.

4
.
Remove
sensor
.

5
.
Installation
is
reverse
of
removal
.

"
Replace
any
lost
coolant
.

0012703

"
Use
a
new
copper
sealing
washer
when
installing
new

Tightening
Torque

"
Engine
coolant
temperature

to
cylinder
head
.....
..
.
...
......
13
Nm
(10
ft-Ib)

FUEL
INJECTION



130-
25

0012704b

Fig
.
38
.
M52
engine
:
Engine
coolant
temperature
(ECT)
sensor
(A)
is
located
beneath
top
engine
cover
(8)
and
crankcase
vent

hose
(C)
.

Intake
air
temperature
(IAT)
sensor,

replacing

The
intake
air
temperature
(IAT)
sensor
for
the
M52/S52US

engine
is
mounted
on
the
bottom
of
the
intake
manifold
.
See
Fig
.

39
.

2
.
Unclip
crankcase
venting
hose
from
cylinder
head
cov-

er
.
See
Fig
.
38
.



Fig
.
39
.
M52/S52US
engine
:
Intake
air
temperaturesensor
location
in

bottom
of
intake
manifold(arrow)
.
Throttle
housing
shown
re

3
.
Under
intake
manifold,
disconnect
harness
connector



moved
.

fromsensor
.

1
.
Disconnect
intake
air
bootfrom
throttle
housing
.
Unbolt

throttle
housing
and
¡ay
aside
.
(It
is
not
necessary
to

disconnect
throttle
cable
or
electrical
harnessconnec-

tors
from
throttle
housing
.)

sensor
.



2
.
Remove
electrical
harness
connector
from
IAT
sensor
.

3
.
Unclip
temperature
sensor
and
remove
from
intake

manifold
.

4
.
Installation
is
reverse
of
removal
.
Use
a
new
gasket
at

the
throttle
housing
.

SIEMENS
MS
41
.1
COMPONENT
REPLACEMENT

130-
2
8



FUEL
INJECTION

Tableh
.
ECM
Pin
Assignment-Bosch
DME
M1
.7

Pin
Signal
Componenttfunction



Signal

1



Output



Fuel
pump
relay
control



Fuel
pump
relay,
terminal
85

2



Not
used

3



Output



Cyl
.
2
and
cyl
.
4
fuel
injection
valve
control



Cyl
.
2
and
cyl
.
4
fuel
injection
valves
4



Not
used

5



Not
used

6



Ground



Ground,
fuel
injection
valveoutputstages



Ground
point

7



Not
used

8



Output



"Check
engine"
indicator
control



Instrument
cluster

9



Not
used

10



Not
used

11



Output



DKV
potentiometer
signal



Transmission
control
module
(EGS)

12



Input



Throttleposition
sensor



Throttleposition
Signal

13



Not
used

14



Input



Volume
air
flow
sensor



Volume
air
flow
sensor
(signal
ground)

15



Input



Cyl
.
1-2
knock
sensor



Cyl
.
1-2
knock
sensor

16



Input



Camshaft
position
sensor
(cylinder
identification)



Camshaft
position
sensor
(cylinder
identification)

17



Output



ti
measurement
signal
(fuel
consumption)



Instrument
cluster

18



Output



Intakeair
resonance
changeover
valve
(DISA)



Intake
air
resonance
changeover
valve
19



-



Not
used

20



Not
used

21



Not
used

22



Not
used

23



Not
used

24



Output



Cyl
.
3
ignition
coil
control



Cyl
.
3
ignition
coil

25



Output



Cyl
.
1
ignition
coil
control



Cyl
.
1
ignition
coil

26



Input



Battery
voltage



B
+junction
point

27



Output



Engine
control
module
relay
control



Engine
control
module
relay,
terminal
85
28



Ground



Ground
for
electronics
and
shielding
of
sensors



Ground
point

29



Output



Idle
speed
control
valve
control



Idle
speed
control
valve

30



Not
used

31



Not
used

32



Output



Cyl
.
1
and
cyl
.
3
fuel
injection
valve
control



Cyl
.
1
and
cyl
.
3
fuel
injection
valves

33



Not
used
34



Ground



Ground,
output
stages
(except
for
ignition
and
fuel



Ground
point
injection
valves)

35



Not
used

36



Output



Evaporative
emissionvalve
control



Evaporative
emission
valve

37



Output



Oxygen
sensor
heater
control



Oxygen
sensor
relay,
terminal
85
38



Not
used
39



Not
used
40



I
Not
used

41



I
Input



,
Volume
Air
Flow
sensor



Volume
air
flow
sensor
(voltage
varies
with
engine
load)

42



1
Input



1
Cyl
.
3-4
knock
sensor



1
Cyl
.
3-4
knock
sensor

43



Ground



Ground
for
sensors



Engine
coolant
temperature
sensor,
cyl
.
1-2
knock
sensor,
cyl
.
3-4
knock
sensor,
and
throttle
position
sensor

44



1
Input



1
Camshaft
position
sensor
(cylinder
identification)



1
Camshaft
position
sensor
(cylinder
identification)

ECM
PIN
ASSIGNMENTS

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

130-
3
0



FUEL
INJECTION

Pin
Signal
Component/function



Signal

ECM
PIN
ASSIGNMENTS

Table
1.
ECM
Pin
Assignment-Bosch
DME
M3
.1

1



output



Fuel
pump
relay
control



Fuel
pump
relay
switches
with
engine
runningor
cranking
(crankshaft
position
Signal
mustbe
present
for
relay
switchover)

2



1
output



1
Idle
speed
control
valve



1
Pulsad
ground-
close
signal
(seealsopin29)

3



output



Fuel
injectorcontrol,
cyl
.
1



Pulsedground
(injection
pulsewidth
in
ms)
with
engine
running

4



output



Fuel
injectorcontrol,
cyl
.
3



Pulsedground
(injection
pulsewidth
in
ms)
with
engine
running
5



output



Fuel
injector
control,
cyl
.
2



Pulsedground
(injection
pulse
width
in
ms)
with
enginerunning

6



ground



Ground



Ground
for
fuel
injector
output
stages

7
vacant
-



-

8



output



Check
Engine



Check
éngine
lamp
control
ground

9
vacant
-



-

10
vacant
-



-

11



output



Throttle
valve
position



Load
signal
to
transmission
control
module
12



input



Throttle
position
sensor



Voltage
varies
with
throttle
position

13



output



Mass
air
flow
sensor



Air
flow
sensor
hotwire
burn
off
(voltage
for
0
.5
seconds
after
shutdown)

14



ground



Mass
air
flow
sensor



Ground
for
air
flow
sensor

15
vacant
-



-

16



input



Cylinder
identification
sensor



A/C
voltage
pulse
per
camshaft
revolution
(between
pin
16
and
44)
17



output



Fuel
consumption
(ti)



Fuel
consumption
output
(KVA
Signal)
to
instrument
cluster

18
vacant
-



-

19
vacant
-



-

20
vacant
-



-

21vacant
-



-

22
vacant
-



-

23



output



Ignition
control
(terminal
1),
cyl
.
no
.
2



Primary
Signal,
ignition
coil
cyl
.
no
.
2

24



output



Ignition
control
(terminal
1),
cyl
.
n
o
.
3



Primary
signal,
ignition
coil
cyl
.
no
.
3

25



output



Ignition
control
(terminal
1),
cyl
.
n
o
.
1



Primary
signal,
ignitioh
coil
cyl
.
no
.
1

26



input



Power
supply
(terminal
30)



Battery
voltage
(B+)
at
al¡
times
(terminal
30)

27



output



Main
relay
control



Main
relay
activation
(to
relay
terminal
85)

28



ground



Ground



Ground
for
ECM
and
sensor
shielding

29



output



Idle
speed
control
valve



Pulsed
ground-
open
signal
(see
also
pin
2)

30
vacant
-



-

31



output



Fuel
injector,cyl
.
no
.
5



Pulsedground
(injection
pulsewidth
in
ms),
cyl
.
no
.
5

32



output



Fuel
injector,cyl
.
no
.
6



Pulsedground
(injection
pulse
width
in
ms),
cyl
.
no
.
6

33



output



Fuel
injector,cyl
.
no
.
4



Pulsedground
(injection
pulsewidth
in
ms),
cyl
.
no
.
4

34



ground



Ground



Ground
for
output
stages

35
vacant

36



output



Evaporative
purgevalve
control



Pulsed
ground
with
engine
at
normal
temperature
and
varying
engine
load

37



output



Oxygen
sensor
heater
relay
control



Oxygen
sensor
heater
relayactivation
(ground
at
terminal
85)

38
vacant
-



-

39
vacant
-



-

40
vacant



-

41



input



Mass
air
flow
sensor



Voltage
(+)

42
vacant
-



-

43



ground



Ground



Ground
for
temperatura
sensors
(ECT
sensor,
IAT
sensor,
TP
sensor)

44



input



Cylinder
identification
sensor



A/C
voltagepulseper
camshaft
revolution
(between
pin
16
and
44)

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

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

130-
34



FUEL
INJECTION

Pin



i
Signal



1
Component/function



1
Signal

1



output



Oxygen
sensor
(monitoring
sensor)heater



Oxygen
sensor
heater
control
(switched
ground)

2



output



Idle
speed
control
valve



Pulsed
ground-close
signal
(see
also
pin
29)

3



output



Fuel
injector
control,
cyl
.
1



Pulsed
ground
(injection
pulsewidth
in
ms)
cyl
.
1

4



output



Fuel
injector
control,
cyl
.
4



Pulsed
ground
(injection
pulse
width
in
ms)
cyl
.
4

5



not
used



-



-

6



ground



Ground



Ground
for
fuel
injector
output
stage

7



not
used



-

8



1
output



1
Check
Engine



1
Instrument
cluster,
Check
Engine
lamp

9



not
used



-



-

10



input



Electronic
immobilizer
control
(EWS
II)



Electronic
immobilizer
control
(EWS
II)
module

11



output



Automatic
climate
control



Automatic
climate
control,
to
evaporator
controlier

12



not
used



-



-

13



not
used



-



-

14



not
used



-



-

15



not
used



-



-

16



input



Intake
air
temperature



Intake
air
temperature
Signal

17



input



Mass
air
flow
meter



Intake
air
signal

18



not
used



-



-

19



input



Oxygen
sensor
(monitoring
sensor)



Oxygen
sensor
control

20



output



Crankshaft/rpm
sensor



Crankshaft/rpm
sensor
control

21



input



Camshaft
position
sensor



Camshaft
position
signal

22



output



Ignition
coil
control,
cyl
.
3



Primary
signal,
ignitioncoil
3

23



output



Ignition
coil
control,
cyl
.
4



Primary
signal,
ignitioncoil
4

24



not
used



-



-

25



not
used



-



-

26



input



Power
supply
(terminal
30)



Battery
voltage
(B+)
at
al¡
times

27



input



Main
relay
control



Main
relay
activation
(terminal
85)

28



ground



Ground



Ground
for
ECM
and
sensor
shielding

29



output



Idle
speed
control
valve



Pulsed
ground-open
signal
(seealsopin
2)

30



output



Oxygen
sensor
(monitoring
sensor)
heater



Oxygen
sensor
heater
control
(switched
ground)

31



output



Fuel
injectorcontrol,
cyl
.
3



Pulsed
ground
(injection
pulsewidth
in
ms)
cyl
.
3

32



output



Fuel
injector
control,
cyl
.
2



Pulsed
ground
(injection
pulsewidth
in
ms)
cyl
.
2

33



I
not
used

40



input



Knock
sensor
#2
(cyl
.
3,4)



Knock
sensor
#2
signal

41



not
used



-



-

42



input



Vehicle
speed



Vehicle
speed
signal
from
instrument
cluster

43



not
used



-



-

44



output



Throttleposition
sensor
(TPS)



Throttleposition
reference
signal

ECM
PIN
ASSIGNMENTS

Table
k
.
ECM
Pin
Assignment-Bosch
DME
M5
.2

34



ground



Ground



Ground
for
ECM/
output
stages

35



not
used



-



-

36



input



A/C
compressor
relay



A/C
compressor
relay
control

37



not
used



-



-

38



not
used



-



-

39



not
used



-



-