Suzuki VZR1800 2007, Service Manual

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11-16 SERVICING INFORMATION
ELECTRICAL
Complaint Symptom and possible causes Remedy
No sparking or poor
sparking 1. Defective ignition coils
2. Defective ignition coil/plug caps
3. Defective spark plugs
4. Defective CKP sensor
5. Defective ECM
6. Defective TO sensor
7. Open-circuited wiring connections Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Spark plug soon
become fouled with
carbon. 1. Mixture too rich
2. Idling speed set too high
3. Incorrect gasoline
4. Dirty air cleaner element
5. Too cold spark plugs
Inspect FI system.
Adjust throttle valve synchro-
nization and idling speed.
Change.
Replace.
Replace with hot type plug.
Spark plug become
fouled too soon. 1. Worn piston rings
2. Worn piston or cylinders
3. Excessive clearance of valve stems in valve
guides
4. Worn stem oil seal
Replace.
Replace.
Replace.
Replace.
Spark plug elec-
trodes overheat or
burn 1. Too hot spark plugs
2. Overheated the engine
3. Loose spark plugs
4. Too lean mixture Replace with cold type plugs.
Tune up.
Retighten.
Inspect FI system.
Generator does not
charge. 1. Open- or short-circuited lead wires, or loose lead
connections
2. Short-circuited, grounded or open generator coil
3. Short-circuited or punctured regulator/rectifier
Repair or replace or
retighten.
Replace.
Replace.
Generator does
charge, but charg-
ing rate is below the
specification. 1. Lead wires tend to get shorted or open-circuited
or loosely connected at terminals.
2. Grounded or open-circuited generator coil
3. Defective regulator/rectifier
4. Defective cell plates in the battery
Repair or retighten.
Replace.
Replace.
Replace the battery.
Generator over-
charges 1. Internal short-circuit in the battery
2. Damaged or defective regulator/rectifier
3. Poorly grounded regulator/rectifier Replace the battery.
Replace.
Clean and tighten ground
connection.
Unstable charging 1. Lead wire insulation frayed due to vibration,
resulting in intermittent short-circuiting.
2. Internally shorted generator
3. Defective regulator/rectifier
Repair or replace.
Replace.
Replace.
Starter button is not
effective. 1. Run down battery
2. Defective switch contacts
3. Brushes not seating properly on starter motor
commutator
4. Defective starter relay/starter interlock switch
5. Defective main fuse
Repair or replace.
Replace.
Repair or replace.
Replace.
Replace.