4-3
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TROUBLESHOOTING
5. Fuel Pump (High pressure side) Inspection
You should hear the pump hum when the combination switch is turned "ON".
Is the hum heard?
YES – GO TO STEP 6.
NO – Perform fuel pump system (High pressure side) inspection (page 5-99).
6. Fuel Flow Inspection
Inspect the fuel flow (page 5-99)
Is the fuel flow within specification?
YES – GO TO STEP 7.
NO – • Clogged fuel feed hose
• Clogged fuel strainer (High pressure side)
• Pressure regulator malfunction (page 5-98)
• Faulty fuel pump (High pressure side)
7. Spark plug inspection
Remove and inspect the spark plugs.
Is the spark plug wet?
YES – • Incorrect spark plug heat range
• Incorrect spark plug gap
• Clogged between the silencer and cylinder head
• Improper vapor separator float height
NO – GO TO STEP 8.
8. Cylinder Compression
Check the cylinder compression (page 14-32).
Is the compression normal?
YES – GO TO STEP 9.
NO – • Improper valve clearance
• Valve stuck open
• Worn cylinder and piston rings
• Damaged cylinder head gasket
• Seized valve
• Improper cam chain adjustment
9. Fuel injector inspection
Inspect the fuel injector (page 5-103)
Is the fuel injector normal?
YES – GO TO STEP 10.
NO – • Repair the open or short circuit in the fuel injector wire
• Faulty fuel injector
10. Ignition system inspection
Check the ignition system (page 8-3).
Is the ignition system normal?
YES – GO TO STEP 11.
NO – Faulty ignition system.
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