Suzuki LT-Z400, Service Manual

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1H-2 Ignition System:
Diagnostic Information and Procedures
Ignition System Symptom Diagnosis
B933H21804001
Condition Possible cause Correction / Reference Item
Spark plug not sparking Damaged spark plug cap. Replace.
Damaged spark plug. Replace.
Fouled spark plug. Clean or replace.
Wet spark plug. Clean and dry or replace.
Defective ignition coil. 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) Defective ignition coil. Replace.
Fouled spark plug. Clean or replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Open-circuited wiring connections. Repair or 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 standard spark plug.
Spark plug quickly
becomes fouled with oil
or carbon Worn piston rings. Replace.
Worn piston. Replace.
Worn cylinder. Replace.
Excessive valve-stem to valve-guide
clearance. Replace.
Worn valve stem oil seals. Replace.
Spark plug electrodes
overheat or burn Incorrect spark plug. Change to cold type spark plug.
Overheated engine. Tune-up.
Loose spark plug. Tighten.
Excessively lean air/fuel mixture. Inspect FI system.
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