Page 155 - 2019 SHOP MANUAL CRF1000/A/D

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IGNITION SYSTEM
TROUBLESHOOTING

• Inspect the following before diagnosing the system.
– Faulty spark plug
– Loose spark plug cap and spark plug connection
– Loose ignition coil connectors
– Water got into the spark plug cap (Leaking the ignition coil secondary voltage)
• If there is no spark at one cylinder, temporarily exchange the direct ignition coil with the other good one and perform the spark
test. If there is spark, the original direct ignition coil is faulty.
• "Initial voltage" of the ignition primary coil is battery voltage with the ignition switch turned ON and engine stop switch turned " "
(The engine is not cranked by the starter motor).
No spark at spark plug
Unusual condition Probable cause (Check in numerical order)
Ignition No initial voltage with the 1. Faulty ignition switch
coil ignition switch ON and engine 2. Faulty engine stop switch
primary stop switch " " (Other 3. Faulty FI relay or its related circuits
voltage electrical components are 4. An open circuit in Black/white wire between the FI relay and ignition coil
normal). 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 1. Incorrect peak voltage adaptor connections (System is normal if
drops by 2 – 4 V while cranking measured voltage is over the specifications with reverse connections).
the engine. 2. Battery is undercharged (Voltage drops largely when the engine is
started).
3. No voltage between the Black/white (+) wire and body ground (–) at the
ECM/PCM connector or loosen ECM/PCM connection
4. An open circuit or loose connection in Green wire at the ECM/PCM
5. An open circuit or loose connection in Blue/black, Blue/white, Blue/red,
or Blue/yellow wires between the ignition coil and ECM/PCM
6. Faulty following components:
– CRF1000/A: sidestand switch, clutch switch, or gear position switch
– CRF1000D: sidestand switch or neutral switch
7. Loose or poor connection or an open circuit in No. 6 related wires
– Sidestand switch line: Green/white and Green wires
– Clutch switch line (CRF1000/A): Green/red and Green/white wires
– Gear position switch line (CRF1000/A): Light green wire
– Neutral switch line (CRF1000D): Light green wire
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 1. Incorrect peak voltage adaptor connections
there is no peak voltage while 2. Faulty peak voltage adaptor
cranking the engine. 3. Faulty CKP sensor
4. Faulty ECM/PCM (in case when above No. 1 through 3 are normal).
Initial voltage is normal, but 1. The multimeter impedance is too low; below 10 MΩ/DCV.
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 at least once).
4. Faulty ECM/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 current ampere
normal, but no spark jumps at 2. Faulty ignition coil
plug.
CKP Peak voltage is lower than the 1. The multimeter impedance is too low; below 10 MΩ/DCV.
sensor standard value. 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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