Suzuki VLR1800, Service Manual

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1H-2 Ignition System:
Diagnostic Information and Procedures
Ignition System Symptom Diagnosis
B822H11804001
Condition Possible cause Correction / Reference Item
Spark plug not sparking Damaged spark plugs. Replace.
Fouled spark plugs. Clean or replace.
Wet spark plugs. Clean and dry or replace.
Defective ignition coil/plug caps. Replace.
Defective ignition coils. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Open-circuited wiring connections. Repair or replace.
Open or short in high tension cord. Replace.
Engine stalls easily (No
spark) Fouled spark plugs. Clean or replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Spark plug is wet or
quickly becomes fouled
with carbon Excessively rich air/fuel mixture. Inspect FI system.
Excessively high idling speed. Inspect FI system.
Incorrect gasoline. Change.
Dirty air cleaner element. Clean or replace.
Incorrect spark plug (Cold type). Change to hot type spark plug.
Spark plug quickly
becomes fouled with oil
or carbon Worn piston rings. Replace.
Worn pistons. Replace.
Worn cylinders. Rebore or replace.
Excessive valve-stem to valve-guide
clearance. Replace.
Worn valve stem oil seals. Replace.
Spark plug electrodes
overheat or burn Incorrect spark plug (Hot type). Change to cold type spark plug.
Overheated engine. Tune-up.
Loose spark plugs. Tighten.
Excessively lean air/fuel mixture. Inspect FI system.