Honda CB900F 919 (2001) [380/432] Voltag

Honda CB900F 919 (2001) [380/432] Voltag
IGNITION SYSTEM
TROUBLESHOOTING
Inspect
the
following
be
fore
d
iagnos
ing th e system.
- F
aul
ty spark p
lug
- Loose spa rk plug cap
or
spa rk
plug
wire
connection
-
Water
in
the
direct
ign
ition
coil
(leaking ignition coil
secondary
voltage)
If
there
is no spark at
eithe
r cyl
inde
r,
temporar
ily
exchange
the
ignition
coil
with
a
know
n-
good
one
and
perform
the spa rk
test.
If
the
re is spark,
the
excha
nged
ignition
coi
l is faul
ty
.
"Initial v
olta
ge"
of
the
ig
nition
primary
coil is
the
battery
voltage
w ith
the
ignition
switch
ON
and
engine
stop
switch
at RUN
(The
engine
is not cranked by
the
starter
motor
).
Unusual
condition
Probable
cause (Check in
numerical
order)
Ignition
coil
No
init
ial
voltage
w ith ignition
and
l.
Faulty
engine
stop
switch.
primary
engine
stop
swi
tches ON.
(Other
electrl-
2. An
open
ci
rcuit
in Black/White
wire
between
the
ignition
voltage
cal components are
normal)
coil
and
eng
ine
s
top
sw
itch.
3. l oose
or
poor
con
nect
of
th e
ign
ition
coil
pri
mary
wi
re
terminal,
or
an
ope
n
circuit
in
primary
coil
(Check at the
ECM connector).
4.
Faulty ECM
(w
hen th e initial vo
ltage
is
nor
mal
whil
e dis-
conne
cting
ECM
connec
tor)
Initial vo
ltage
is norm al,
but
it
dro
ps
l. Incorrect peak vol
tage
adapto
r connections.
down
to 2 - 4 V w hile cranking
the
2.
Underc
harged
battery.
engine.
3. No vol
tage
bet
we
en the Black/w hite
(+)
and Body
gro
und
(-) at th e ECM multi-co
nnec
tor
or
loose
ECM
connect
ion.
4. An ope n
cir
cuit
or
loos
e conn
ectio
n in Green w ire.
5. An open circuit or
loose
connection in Blue/black
and
Yell
ow
/blue
wires
between
the
i
gniti
on coils and ECM.
6. Sh
ort
cir
cuit
in
ignition
prim
ary
coil.
7. Faulty side stan d
switch
or n
eutr
al sw itch.
8.
An
ope
n circuit
or
l
oose
connection in No.7 related cir-
c
ult
w ires.
.
Side s
tand
s
wi
tch
lin
e: Green/w hite
wi
re
.
Neutral
sw
itch line:
li
ght green w ire
9. Fa
ult
y
ign
it
ion
pulse
genera
tor
(measure th e peak volt-
age).
10.
Fa
ult
y ECM (in case
wh
en
above
No. 1 - 9 are n
or
mal).
l.
Fa
ult
y peak
voltag
e ad
aptor
connections.
Initial
vol
tage is norm al, but no peak 2. Faulty peak
volta
ge
adaptor
.
voltage
while
cranking the eng ine.
3. Faulty ECM (in case w hen above
No
.1, 2 are no
rmal)
.
l. The m
ulti
meter
impeda
nce is
too
low;
b
elow
10
Initial
voltage
is
norma
l,
but
peak
volt
-
MQl
DCV.
age is lowe r
than
standard
value. 2.
Cranking
speed
is
too
low
(battery
unde
r-charged).
3. The
samp
l
ing
t
imi
ng
of
the
tester
and
measured
pulse
were
not
synchronised
(system is
norma
l
if
measu
red
I
voltage is
over
the
st
andard
voltage at least once).
4. Faulty ECM (in case
when
above
No
.1
- 3 are
normal).
l. Faul
ty
spar
k
plug
or
leaking
ign
ition
coil
secondary
cur
-
Init
ial and peak
voltage
are
normal,
but
rent
ampe
re.
do
es not spark.
2.
Faulty ignition
coil
(s).
l.
The
multimeter
i
mp
edance is
too
low ; be
low
10
Ignition pulse Peak
voltage
is
lower
tha
n standard MQlDCV.
genera
tor
val ue.
2. Cra
nking
speed is
too
low (
battery
under
c
harged)
.
3. The
samp
l
ing
tim ing of the tester and mea
sur
ed
pulse
we re not synchro nised
(system
is no
rma
l
if
measured
vol
tage is
over
the
standard
vo
ltage
at least once).
4.
Faul
ty
ECM
(whe
n above N
o.1
- 3 are n
or
mal).
l. Fau
lty
peak voltage adaptor.
No peak vo ltage.
2.
Faulty
ignit
ion
pulse
generat
or
.
17-3

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