1994 BMW 325i IAC valve

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

GRN/VIO

HOT
IN
RUNAND
START



HOT
FILM
AIR



HALLEFFECT



CRANKSHAFT



ELCTRONIC
r



-1FRONT
MASSMETER
CAMSHAFTSENSOR
POSITION/RPM
IMMOBILIZERCONTROL
I



(POWER



r
-



-
1



1



1



SENSOR



MODULE
(EWS11)
FUSE
I



FSSE



F



IDIS7RIBUTION
I
iDA
ISA
(BOX
I
I
(199fi)
(1997)
I
is
Y



iBy
$
1D01B



I



D
-
22

OXYGENSENSOR
(BEHIND
CATALYTIC
CONVERTER)
88648

FUEL
PUMP

SPLICE
BLK
-----
.--_
.-------

OXYGENSENSOR
(FRONT
OFCATALYTIC
CONVERTER)

Engine
Management

1996-971
.91-(2
of
2)

EVAPORATIVE
IDLESPEED
EMISSION
CONTROL
VALVEVALVE

ELECTRICAL
WIRING
DIAGRAMS
ELE-79

EXCEPT
1997
318
ti

INSTRUMENT
CLUSTER
SYSTEM
EXCEPT
31811

INTAKEAIR



I
CYL1-2



CYL3-4
RESONANCE



INTAKEAIR
CHANGEOVERKNOCKSENSORTEMPERATURE
VALVE



SENSOR

BLK
IENGINESPEED
I
-
2
k
I
INPUT



I
GRG=1fi~
CHECK
ENGINE
I
WHT/BLK
21
I
FUEL
X
t
fi
'C
CONSUMPTION

I
~GRN/RED
13
3
I
FUEL
I
CONSUMPTION
SRN/VI
jg
TEMPSENS
(L)
BRN/V=L
17{iTEMPSENS(-)

INSTRUMENT
CLUSTER

ENGINECOOLANT
TEMPERATURESENSOR

WW=TIBLK



BOR4
(I
I
__J
ON-BOARD
COMPUTER
BRN/RED
74,
r
_
----
I
~ITEMPSIGNAL
I
-
~GRN/RED
42
J
~IFUELCONSUMPT
I
WHT/BLK
83
~~
I
VEHICLE
SPEED
I
GRV
S,
IENGINDICATOR
I
VEL
78
-
-~{ICRNKPOS/RPM
_ILL
-(ICRNKPOSIRPM
BRN
(SHIELD
GROUND
YEL



I21



CAMSHFTPOS
GRV/BLU
17
'GROUND
GRV/V
-
10
4S
`
VEL77,
:SIGNAL

8-{
I02
SENSOR
SIG

B-
:
..
.SORGND
OISHTNGGND
VEL
19
I
B
3D~I023ENSORBIG
02SHTNGGND
BRN/VIO
B7
I
{
ACTIVATEVALVE
-
-
~BRNIG
RN29
J
I
~
I
ISC
VALVE
CTRL
BRN
2
BRNIBLU~JACTIVATE
VALVE
BIACTIVATEVALVE
-
BILK
70
'
~
BLK
40
;CVL
1-2KS
-~{
I
CYL
3-6
KS
BRN/BLK
711
SENSGROUND
BRN/RED
~
IINTKAIRTEMP
BRN/VIO
44
I



I
~
W
L~~~
THROTTLEPOS
GRVRY/
-
W
I
SVSUPPLY



I
ENGINECONTROL
MODULE
(DME)

THROTTLE
POSITION
SENSOR

SO



OXYGEN
OXYGEN
OXYGEN
OXYGEN
CAMSHAFT



DUALTEMPERATURE
SECONDAIR
PUMP
RELAY



VALVE
ID



SECOND



CARBON



EXHAUST
UST



SENSOR



SENSOR]



SENSOR



SENSOR]



POSITION



SENSOR
INTAKE
AIR
(RUNNING



AIRPUMP



CANISTER



FLAP



(INFRONTOF



(IN
FRONTOF



(BEHIND



(BEHIND



SENSOR



TEMPERATURE



(COOLANT
CONVERTER)



CONVERTER)



CONVERTER)



CONVERTER)



(CYLINDER
ID)



TEMPERATURE)
LOSSES)
VALVEVALVEVALVE



SENSOR

68894

(1997
ONLY)

ELECTRICAL
WIRING
DIAGRAMS
ELE-81

Engine
Management

1996-97
2
.81L
(2
of
2)

II

````



``



aa
a
a



.
.U



~lal



f
2f

COMPUTER
DATA
LINES
(1997
0NLY)

~t
11~

EXCEPT1996M3

TRANSMISSION
CONTROL



~-



-
MODULE(EGS)



MASS
METE
R



-



-
MASSMETER



6117

1
1
L,2)13)l

2s,t,54,1,95,1,as,t,
60,1,
99,L
-
14,L,
2~
1



18~17~
19~
.~



_
CRANKSHAFT
I



DATA
LINK
CONNECTOR



POSITION/
1



I



RPM

i
-----------~



SENSOR

BRN/VIO
18
~



I
~BRN/YE~L
~17_~
1



I
~
O
RN/RENN~
I



I
X17
I



I
.



WHT/BLK
21
I



I
-
GRrr,~I
I
XL6
I-_-J
INSTRUMENT
CLUSTER

I



I



IGRY



20-
ICHECKENGINO



I
INSTRU-



IFUELCONS
MENT



GRN/RED
46
I
FUELCONS
CLUSTER



SRWRED
10
I
ENGCOOLTEMP
GRV/BRN
39
I
GRY
14
(GROUND
NCA
S1
IINTKAIRTEMP
(GROUND
BLK64,
(GROUND
VEL
65
ICAMS
HAFTPOS
BR
N



43
~ICAMSHAFTPOS
B
ISENSO
YES,



RSIGNAL
I
8



I02S
SIG
GNO



1
-,
I02SHTGGND



I
YEL
~ISENSORSIGNAL
I
BLK
71
1
025
SIG
GNO



I
B
1
02SHTGGND
I
SRN
55
I
02S
H
TG
GND



I
BLK70,
I
02551GGND
I

BRN
255,SENSORSIGNAL
I
B~1025HTGGND
I
Y~102SSIGGND
I
-~
SENSORSIGNAL
1
GflV/V=0



BIGEXHSTFLAP
I
GRN/BLU
61,



I
IACTIVATEVALVE
I
BRN/WHT
62
VEL/BLU
50
IACTIVATEVALVE
I

BRN/GRN
35
IRUNNINGLOSS
1
IACTIVATEVALVE
I
BLK
85
ICANLOW
I
VEL
86
CANHIGH
I
BLK/BLU
74
AIC



-~IACTVA/C
COMP



I
VIO/GRY
19
SYSTEM



A/C
ON
BIG



I
BLK
36
I
CRNKSHFTRPM
I
GRN/BLU
60,
I
PROGRAMVOLT



I
WHT/VIO/VEL
88
I
TxDYEL
6
I
SILK



7~
1
HOTFAM
MTR
HOTFAMMTR
BRN/0=
1
(GROUND
YEL
4
<
IVOLTSUPPLY
.LK
'ISENSORSIGNAL
.BRN/B=
K
400
(1
GROUND
VEL/RED
11
IFUELTNKPRES
REDIGRN
00
~IVOLTSUPPLV
BLK
12ITHROTPOSSIG
BRN
42
GROUND
ENGINECONTROL
MODULE
(DME)

NCA
J
]
-k
0
1



I



RE
~
/GRN
3,

GRV/WHT
1
YEL/RED
3
BRN/BLK
2

THROTTLE
POSITION
SENSOR

FUELTANK
l



ml



mlml



PRESSURESENSOR
¢I
¢I
ml
>I
t7
B



¢I3I
m
O
3m



¢I
>I
m

FRONTPOWERD/STRIBUTIONBOX



CAMSHAFT



KNOCKSENSOR
EVAPORATIVE
pOSITIONSEN50R
SECOND
SOLENOIDVALVE
CARBON
EXHAUST
1



SECOND
AIR
PUMPRELAV



I



EMISSION
VALVE



CYLINDER
ID)



AIRPVMP



(RUNNING



CANISTER



GASFLAP
VA
I



VALVE
LOSSES)
VALVEVALVE
CYLd-
t
-
~



fi



CVL
1-3

t
Gt03

Engine
Management

19982
.5L
(3231),
2
.8L
(3281),
3
.2L
(M3)
(2
of
2)

ELECTRICAL
WIRING
DIAGRAMS
ELE-85

BRN/GRN
1
BRN
23
WHT/GRV/VEL
RED



I
4
.ED



I
6B
BRN/GRN



L

RED/WHT
B
RED)-
~



-
9
RED/WHTPED/WHT
RED/
.HT
BRN



I
N
CABF.
RED/WHT
'NCA

J



1



_IACTIVATEVALVE
I
BRN63,
1ICVLd-fiKS
I
BILK
64
(GROUND
I
VEL
66
ICAMSHAFTPOS
I
.RN
B6
I
025HTGGND
I
ILK
fi7
102SSIGGND
I
BRN
fib
I



I
I
ACTIVATEVALVE
I
BRN/GRN
69
-
ACTIVATE
RELAY

6LK



701
`1025
SIG
GND



I

BRN



61`
I
1025SIGGNO



I
02SHTGGND
I
BRN73~BLK72,
IACTIVATERELAY
I
YEL
75'102SSIGGNO
'
ISENSORSIGNAL
I
`
ISENSORSIGNAL
I
328



YEL
77
ISENSORSIGNAL
I
WHT/YEL



AND
M3



YEL
78
ONLY



ISENSORSIGNAL
I
W-1
,I



I



I
GRY/YEL



ON
WHT/GRN
BD
IASC-SIGZA



I

2D
BILK



WHT/GRV
81
102SHTGGND
A50-SIG
ZWV
21
VEL



BLK
83
ISENSORSIGNAL
I
INSTRUMENT
1
BLK



WHTIRED/VEL
CLUSTERSVSTEM



82
I



I
"



I



BLK
BB
I
ASC-SIGMCR



1

1SB627

84,L~
28,E
B
-
88,1,80,1
88,E

H-

21
I
IS
171
DATA
LINK
CONNECTOR

G103

6

I



II



CRANKSHAFT
-



---
-



POSITION/
TRANSMISSION
CONTROL
MODULE
(EGS)



RPMSENSOR

2



GRVIVIO
B2
GRN/BLU
B1
(ACTIVATE
VALVE
I
SIG
EXH5T
FLAP
RED/WHT
84
(
BATTERYWHT/VEL

CAN
LOW
YEL
86
I
(CANHIGH
REDIWHT
87
(BATTERY
HIE
44
1



F
-#-
I



WHT/VIO/VEL

Q

H~
l
2I2I2I
ZIZI
Z

OXYGENOXYGEN
OXYGEN
OXYGEN
SENSOR(



SENSORII



SENSOR
I



BENSORII
(-AN-)
(328ANOM3)

ENDNECONTROLMODULE
(ONE)

WHT/REDIYEL
B
r
WHT/GRY
25
i



I
WHT/GRN
4
I



1
WHT/GRV/VEL
15
I



I
WHT/GRY/VEL
26



I
SLIP
CONTROL
MODULE
(ABS/ASC)