Honda SXS700M4 Service Manual page 130

IGNITION SYSTEM
TROUBLESHOOTING
Inspect the following before diagnosing the system:
- Faulty spark plug
- Loose spark plug cap or spark plug wire connection
- Water got into the spark plug cap (leaking the ignition coil secondary voltage)
"Inilial voltage" of the ignition primary coil is the battery voltage with the ignition switch turned to ON (I). (The engine is nol
cranked by the starter motaL)
No spark at spark plug
UNUSUAL CONDITION
PROBABLE CAUSE (Check in numerical order)
Ignition coil No iniUal voltage with the
1.
Faulty main relay and/or related circuits (page 7-13).
primary
ignition switch turned to ON (I),
2.
An open circuit in the Black/red wire between the ignition coil and main
voltage
(Other electrical components relay.
are normaL)
3.
Loose or poor connection of the primary terminal, or an open circuit in
the ignition primary coil.
4.
Faulty PCM (in case when the initial voltage is normal with the PCM
gray connector disconnected).
Initial voltage is normal . but it
1.
Incorrect peak voltage adaptor connections.
drops by 2 - 4 V while cranking
2. Battery is undercharged . (Voltage drops largely when the engine is
the engine. started.)
3.
No voltage at the Redfwhite wire of the PCM (gray) connector, or
loose or poorly connected PCM (gray) connector.
4.
Loose or poor connection, or an open circuit in the Green wire of the
PCM .
5.
Loose or poor connection, or an open circuit in the Greenfblue wire
between the ignition coil and PCM.
6.
A short circuit in the ignition primary coi1.
7. Faulty CKP sensor. (Measure the peak voltage.)
B.
Faulty PCM (in case when above No .1 through 7 are normal).
Initial voltage is normal but
1.
Incorrect peak voltage adaptor connections. (System is normal if
there is no peak voltage while
measured voltage is over the specifications with reverse
cranking the engine.
connections.)
2.
Faulty peak voltage adaptor.
3.
Faulty CKP sensor. (Measure the peak voltage.)
4.
Faulty PCM (in case when above No. 1 and 3 are normal).
Initial voltage is normal but
1.
The multimeter impedance is too low; below 10 MntDCV.
peak voltage is lower than the 2.
Cranking speed is too slow. (Battery is undercharged .)
standard value.
3.
The sampling timing of the tester and measured pulse were not
synchronized. (System is normal if measured voltage is over the
standard voltage alleast once.)
4.
Faulty PCM
~in
case when above NO.1 through 3 are normal).
Initial and peak voltages are
1.
Faulty spark plug or leaking ignition coil secondary curren!.
normal but no spark. jumps.
2.
Faulty ignition coil.
CKP sensor Low peak voltage.
1.
The multi meier impedance is too low; below 10 MntDCV.
2.
Cranking speed is 100 slow. (Battery is undercharged.)
3.
The sampling liming of the tester and measured pulse were not
synchronized. (System is normal if measured voltage is over the
standard voltage at least once.)
4 .
Faulty CKP sensor (in case when above No.
1 through 3 are normal).
No peak voltage.
1.
Faulty peak voltage adaptor.
2. Faulty CKP sensor.
5-4