Ignition System: 1H-4
Diagnostic Information and Procedures
Ignition System Symptom Diagnosis
B947H11804001
Condition Possible cause Correction / Reference Item
Spark plug not sparking Damaged spark plug. Replace.
Fouled spark plugs. Clean or replace.
Wet spark plugs. Clean and dry or replace.
Defective ignition coil. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Open-circuited wiring connections. Repair or 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. 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.
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