IAC valve BMW 325i 1994 E36 Workshop Manual
Page 43 of 759
GENERAL
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...
100-1
Cylinder
Block
and
Crankshaft
.
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...
100-1
Connecting
Rods
and
Pistons
.
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100-1
Cylinder
Head
and
Valvetrain
.
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100-2
VANOS
(Variable
Valve
Timing)
.
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...
100-2
DISA
(Dual
Resonance
Intake
System)
.
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100-3
Engine
Management
System
.
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100-3
Ignition
......
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100-5
Fuel
Delivery
..
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100-5
Cooling
System
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100-5
Lubrication
System
.........
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100-5
MECHANICALTROUBLESHOOTING
.
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100-5
Warnings
and
Cautions
..
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100-5
Cylinder
compression,
checking
.
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.
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)
...
.
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.
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100-8
Basic
Requirements
....
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...
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.100-11
Preventive
Maintenance
......
.
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.
.
.....
100-11
Basic
Engine
Settings
..
.
.....
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.....
100-11
Oxygen
Sensors
.
.
.
...
.
.
.
...
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.
....
.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
Page 563 of 759
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
Page 565 of 759
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
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a
a
.
.U
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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
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'ISENSORSIGNAL
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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
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m
Page 569 of 759
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)