Honda VFR800F 2014 Service Manual page 116

IGNITION SYSTEM
TROUBLESHOOTING
.
lnspect the
following
before diagnosing the system.
-
Faulty spark
Plug
-
Loose plug cap or direct ignition coil connector connection
-
Water
goi-into'the direct ignition
coil (leaking
the ignition coil secondary
voltage)
.
lf
there
is no spark at
eitheicylinder, iemporaiily
ex6hange the direct ignition coil wittr a known good one and
perform the spark
test.
If
there is spark,
ihe
original direct ignition
coil
is
faulty.
No
spark at
spark
Plug
Unusual condition
Probable cause (Check
in numerical order)
lgnition
coil
signal voltage
No peak voltage
1.
The multimeter impedance is
too low;
below
1U
Ml)/lJL;v.
2.
Cranking
speed is
too
slow (Battery is undercharged).
3.
The
sampling timing
of the
tester and measured
pulse were
not
synchronized (System
is
normal if
measured voltage is
over the standard voltage at least once).
4.
Open or
short circuit
in
the ignition coil signal wire between
the between
the
ECM and direct ignition coil
(No,
1:
Blue/
black, No. 2:
Yellow/white, No.
3:
Red/blue, No. 4: Red/
yellow).
5.
Faulty peak voltage adaPtor.
6. Faulty CKP sensor (Measure peak voltage).
7.
Faulty ECM (in case when
above No'
1
through 6 are
normal).
Feek
voltage
is
normal, but no
spark at
plug
Open circuit in
the
direct ignition coil power input wlre
(Black/white).
Open circuit in
the direct ignition coil power input wire
(Green).
1.
2.
5-5