Honda CB 600F Hornet 2007 Shop Manual page 508

IGNITION SYSTEM
TROUBLESHOOTING
• Inspect the following before diagnosing the system.
- Faulty spark plug
- Loose spark plug cap connection
- Loose ignition coil connectors
- Water got into the spark plug cap (shorting the ignition coil secondary voltage)
• II there is no spark at any cylinder, temporarily exchange the ignition coil with the other good one and perform the
spark test. If there is spark, the exchanged ignition coil is faulty.
• "Initial voltage" of the ignition primary coil is the battery voltage with the ignition switch turned ON and engine stop
"O"
switch turned (When the engine is not cranked by the starter motor).
No spark at all plugs
Unusual condition
I
Ignition coil No initial voltage with the ignition
primary volt- ON and engine stop switch turned
"O"
age
(other electrical components
are normal).
Initial voltage is normal, but it drops
down to 2
engine.
Initial voltage is normal, but no peak
voltage while cranking the engine.
Initial voltage is normal, but peak
voltage is lower than standard
value.
Initial and peak voltage are normal,
but does not spark.
CKP sensor Peak voltage is lower than standard
value.
-
No peak voltage.
---
18-4
I
- 4 V while cranking the
Probable cause (Check in numerical order)
1. Faulty engine stop relay.
2. An open circuit in Black/white wire between the igni-
tion coil and engine stop relay.
Loose or poor connect of the ignition coil connectors,
3.
or an open circuit in primary coil (Check at the ECM
connector).
Faulty ECM (in case when the initial voltage is normal
4.
while disconnecting ECM connectors).
1. Incorrect peak voltage adaptor connections.
2. Undercharged battery.
3. No voltage between the Black/white(+) and body
ground(-) at the ECM connector or loosen ECM con-
nection.
4. An open circuit or loose connection in Green wire.
5. An open circuit or loose connection in Yellow/blue or
Blue/yellow wires between the ignition coils and ECM.
6.
Short circuit in ignition primary coil.
7. Faulty sidestand switch or neutral switch.
An open circuit or loose connection in No.7 related cir-
8.
cult wires.
- Sidestand switch line: Green/white wire
- Neutral switch line:Light green or Green/red wires
9. Faulty CKP sensor (measure the peak voltage).
10.Faulty ECM (in case when above No. 1 - 9 are normal).
1. Faulty peak voltage adaptor connections.
2. Faulty peak voltage adaptor.
3. Faulty CKP sensor (Measure the peak voltage).
4. Faulty ECM (in case when above No.1- 3 are normal).
1. The multimeter impedance is too low; below 10 Mnt
DCV.
2. Faulty CKP sensor (Measure the peak voltage).
3. Cranking speed is too low (battery under charged).
The sampling timing of the tester and measured pulse
4.
were not synchronized (system is normal if measured
voltage is over the standard voltage at least once).
5.
Faulty ECM (in case when above
1.
Faulty spark plug or leaking ignition coil secondary
current ampere.
2. Faulty ignition coil (s).
1. The multimeter impedance is too low; below 10 Mill
DCV.
2. Cranking speed is too low (battery undercharged).
The sampling timing of the tester and measured pulse
3.
were not synchronized (system is normal if measured
voltage is over the standard voltage at least once).
Faulty CKP sensor (in case when above No. 1 - 3 are
4.
normal).
1. Faulty peak voltage adaptor.
Faulty CKP sensor.
2.
-
No. 1 - 4 are normal).