Electrical - Suzuki VZR1800 2007 Service Manual

11-16 SERVICING INFORMATION

ELECTRICAL

Complaint
No sparking or poor
sparking
Spark plug soon
become fouled with
carbon.
Spark plug become
fouled too soon.
Spark plug elec-
trodes overheat or
burn
Generator does not
charge.
Generator does
charge, but charg-
ing rate is below the
specification.
Generator over-
charges
Unstable charging
Starter button is not
effective.
Symptom and possible causes
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
1. Mixture too rich
2. Idling speed set too high
3. Incorrect gasoline
4. Dirty air cleaner element
5. Too cold spark plugs
1. Worn piston rings
2. Worn piston or cylinders
3. Excessive clearance of valve stems in valve
guides
4. Worn stem oil seal
1. Too hot spark plugs
2. Overheated the engine
3. Loose spark plugs
4. Too lean mixture
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
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
1. Internal short-circuit in the battery
2. Damaged or defective regulator/rectifier
3. Poorly grounded regulator/rectifier
1. Lead wire insulation frayed due to vibration,
resulting in intermittent short-circuiting.
2. Internally shorted generator
3. Defective regulator/rectifier
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
Remedy
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Inspect FI system.
Adjust throttle valve synchro-
nization and idling speed.
Change.
Replace.
Replace with hot type plug.
Replace.
Replace.
Replace.
Replace.
Replace with cold type plugs.
Tune up.
Retighten.
Inspect FI system.
Repair or replace or
retighten.
Replace.
Replace.
Repair or retighten.
Replace.
Replace.
Replace the battery.
Replace the battery.
Replace.
Clean and tighten ground
connection.
Repair or replace.
Replace.
Replace.
Repair or replace.
Replace.
Repair or replace.
Replace.
Replace.