120-
4
IGNITION
SYSTEM
2
.
Check
for
battery
voltage
o
cofs
.
If
voltage
is
not
Table
b
.
Ignition
Coil
Resistance
present,
check
wire
between
terminal
15
and
ignition
(M42
Engine)
switch
.
See
Electrical
Wiring
Diagrams
.
"
On
M42
engine,
connect
digital
multimeter
between
ter-
minal
15(+)
in
each
harness
connector
and
ground
.
See
Fig
.
4
.
"
On
M44
engine,
connect
voltmeter
between
terminal
2
(15+)
in
connector
and
ground
.
Turn
ignition
on
and
check
for
voltage
.
See
Fig
.
5
.
3
.
Turn
ignition
off
.
0
4a15
Fig
.
4
.
Ignition
coil
harness
connector
terminal
identification
for
M42
engine
.
Fig
.
5
.
Ignition
coil
harness
connector
terminal
identification
for
M44
engine
.
CAUTION-
The
wiring
to
the
coil(via
the
ignition
switch
15+)
is
not
fuse
protected
.
Use
care
when
testing
thiscircuit
.
4
.
Use
a
digital
multimeter
totest
coil
primary
resistance
.
"
On
M42
engine,
use
Table
b
asa
guide
to
check
coil
resistance
.
Make
checks
at
each
harness
connector
.
"
On
M44
engine,
use
Table,c
as
a
guide
to
check
coil
primary
resistance
.
5
.
Inspect
coil
housing
for
hairline
cracks
or
leaking
cast-
ing
material
.
See
Fig
.
7
.
A
leaky
ignition
coil
may
indi-
11502
cate
a
faulty
ECM
(engine
control
module)
.
Check
the
ECM
before
installing
a
new
coil
.
Fig
.
6
.
Ignition
coil
harnessconnector
terminal
identification
for
6-
cylinder
engine
.
IGNITION
SYSTEM
SERVICE
11502
Terminals
Resistance
(refer
to
Fig
.
4
.)
Coil
primary
1
(-)
and
15
(+)
10
.4-0
.8
ohms
Coil
secondary
N
.A
.
N
.A
.
Table
c
.
Ignition
Coil
Resistance
(M44
Engine)
Terminais
Resistance
(referto
Fig
.
5
.)
Coil
#1
primary
1
(-)
and
2
(+)
0
.4-0
.8
ohms
Coil
#2
primary
6
(-)
and2
(+)
0
.4-0
.8
ohms
Coil
#3
primary
7
(-)
and
2
(+)
0
.4-0
.8
ohms
Coil
#4
primary
5
(-)
and2
(+)
0
.4-0
.8
ohms
Coil
secondary
N
.A
.
N
.A
.
NOTE-
If
a
single
coilís
faulty
on
M44
engines,
the
complete
coil
pack
will
have
to
be
replaced
.
Ignition
coil,
testing
and
replacing
(6-cylinder
engine)
CAUTION-
Use
a
digital
multimeter
for
the
following
tests
.
1.
Remove
plastic
enginecovers
from
top
of
engine
by
prying
off
nut
covers
and
removingcover
mounting
nuts
.
See
113
Cylinder
HeadRemoval
and
Installa-
tion
.
2
.
Disconnect
harnessconnectorfromcof
.
Connect
mul-
timeter
between
terminal
15
(+)
in
connector
and
ground
.
See
Fig
.
6
.
3
.
Turn
ignition
on
and
check
for
batteryvoltage
.
"
If
batteryvoltage
is
not
present,
check
wire
between
terminal
15
and
ignition
switch
.
See
Electrical
Wiring
Diagrams
.
"mozo
CAUTION
-
The
wiring
to
termina¡
15
(+)
of
the
coil(vía
the
ig-
nition
switch)
is
not
fuse
protected
.
Use
care
when
testíng
thiscircuit
.
4
.
Turn
ignition
off
.
5
.
Use
a
multimeter
to
test
coil
primary
resistanceat
coil
terminals
.
See
Table
d
.
Table
d
.
Ignition
Coil
Resistance
(6-cylinder
Engine)
Terminals
Resistance
(referto
Fig
.
4
.)
Coil
primary
1
1
(-)
and
15
(+)
X
0
.4-0
.8
ohms
Coil
secondary
l
N
.A
.
N
.A
.
6
.
Remove
coil
and
inspect
coil
housing
for
hairline
cracks
or
leaking
casting
material
.
See
Fig
.
7
.
A
leaky
ignition
coil
may
indícate
a
faulty
engine
control
module
(ECM)
.
Check
ECM
before
installing
a
new
coil
.
811004
Fig
.
7
.
Ignition
coil
being
removed
on
6-cylinder
engine
(M52
engine
shown)
.
CA
UTION-
"
Note
location
of
coil
ground
straps
before
coilre-
moval
;
reinstallin
the
same
location
.
"
When
replacing
ignition
coils,
ensure
that
the
re-
placement
coil(s)
are
from
the
same
manufactur-
er
containing
the
same
partlcode
numbers
.
If
individual
coils
with
the
correct
specifications
are
not
available,
all
coils
should
be
replaced
.
IGNITION
SYSTEM
120-
5
Crankshaft
Position/rpm
Sensor
If
the
engine
control
module
(ECM)
does
not
receive
a
crankshaft
position
signal
during
cranking,
the
engine
will
not
start
.
On
1992-1995(pre-OBD
II)
cars,
the
crankshaft
posi-
tion/rpm
sensor
is
mounted
on
the
front
engine
cover
and
reads
the
toothed
vibration
dampener
wheel
.
See
Fig
.
8
.
Fig
.
8
.
Crankshaft
position/rpm
sensor
mounted
at
front
of
engine
on
1992-1995
cars
.
(arrow)
.
On
1996
and
latee
cars
(OBD
II
compliant),
the
crankshaft
position/rpm
sensor
is
mounted
in
the
left
rear
side
of
the
cyl-
inderblock
.
The
sensor
reads
a
toothed
wheel
mounted
to
the
end
of
the
crankshaft
.
See
Fig
.
9
.
Fig
.
9
.
Crankshaft
position/rpm
sensor
toothed
wheel
mounted
to
rear
of
crankshaft
OBD
II
compliant
cars
.
The
sensor
is
mounted
in
the
left
rear
side
of
the
cylinder
block
.
IGNITION
SYSTEM
SERVICE
