5-5
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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)
• If there is no spark at cylinder, temporarily exchange the ignition coil with a known-good one and perform the spark test. If there
is spark, the original ignition coil is faulty.
• "Initial voltage" of the ignition primary coil is the battery voltage with the ignition switch turned ON and engine stop switch " "
(The engine is not cranked by the starter motor).
No spark at spark plug
Unusual condition Probable cause (Check in numerical order)
Ignition coil
primary voltage
No initial voltage with the ignition
switch turned ON and engine
stop switch " " (Other electrical
components are normal).
1. Faulty ignition switch
2. Faulty engine stop switch
3. Faulty fuel cut relay or its related circuits
4. An open circuit in Brown wire between the ignition coil and fuel
cut relay
5. Loose or poor connection of the primary terminal, or an open
circuit in the primary coil
6. Faulty ECM/PCM (in case when the initial voltage is normal with
the ECM/PCM connector disconnected).
Initial voltage is normal, but it
drops by 2 – 4 V while cranking
the engine.
1. Incorrect peak voltage adaptor connections (System is normal if
measured voltage is over the specifications with reverse
connections).
2. Battery is undercharged (Voltage drops largely when the engine
is started).
3. No voltage between the Black (+) wire and body ground (–) at the
ECM/PCM connector or loosen ECM/PCM connection
4. An open circuit or loose connection in Green/orange wire at the
ECM/PCM
5. An open circuit or loose connection in Blue/yellow or Yellow/blue
wire between the ignition coil and ECM/PCM
6. Faulty sidestand switch, neutral diode (NC700X/XA/S/SA) or
neutral switch
7. Loose or poor connection or an open circuit in No. 6 related wires
– Sidestand switch line: Green/white and Green
– Neutral switch line (NC700X/XA/S/SA): Green/red and Light
green
– Neutral switch line (NC700XD/SD): Light green
8. Faulty CKP sensor (Measure peak voltage)
9. Faulty ECM/PCM (in case when above No. 1 through 8 are
normal).
Initial voltage is normal but there
is no peak voltage while cranking
the engine.
1. Incorrect peak voltage adaptor connections
2. Faulty peak voltage adaptor
3. Faulty CKP sensor
4. Faulty ECM/PCM (in case when above No. 1 through 3 are
normal).
Initial voltage is normal but peak
voltage is lower than the
standard value.
1. The multimeter impedance is too low; below 10 M/DCV.
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. Faulty ECM/PCM (in case when above No. 1 through 3 are
normal).
Initial and peak voltages are
normal but no spark jumps.
1. Faulty spark plug or leaking ignition coil secondary current
ampere
2. Faulty ignition coil
CKP sensor Peak voltage is lower than
standard value.
1. The multimeter impedance is too low; below 10 M/DCV.
2. Cranking speed is too low. (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. Faulty CKP sensor (in case when above No.1 through 3 are
normal).
No peak voltage 1. Faulty peak voltage adapter
2. Faulty CKP sensor
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