3-28 FUEL SYSTEM (DFI)
DFI System Troubleshooting Guide
Symptoms or possible Causes
Clutch lever not pulled in and gear not in neutral
whether sidestand up or not
Though clutch lever pulled in, sidestand up and
gear not in neutral
Vehicle-down-sensor coming off
Vehicle-down-sensor trouble
ECU ground or power supply trouble
Battery voltage low
Spark plug dirty, broken or gap maladjusted
Stick coil trouble
Stick coil shorted or not in good contact
Spark plug incorrect
IC igniter in ECU trouble
Neutral, starter lockout or sidestand switch
trouble
Crankshaft sensor trouble
Stick coil trouble
Ignition switch shorted
Engine stop switch shorted
Starter system wiring shorted or open
Main 30A or ignition fuse blown
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed or missing
Leak from oil filler cap, crankcase breather hose
or air cleaner drain hose
Water or foreign matter in fuel
Fuel pressure regulator trouble
Main throttle sensor trouble
Fuel pressure may be low
Fuel pump trouble
Fuel injector trouble
Inlet air pressure sensor trouble
Inlet air temperature sensor trouble
Water temperature sensor trouble
Crankshaft sensor trouble
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened down
Cylinder, piston worn
Piston ring bad (worn, weak, broken or sticking)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Actions (chapter)
Pull the lever in and shift the gear in neutral.
Sidestand down and clutch lever pulled in
whether gear in neutral or not
Reinstall (see chapter 3).
Inspect (see chapter 3) .
Inspect (see chapter 3) .
Inspect and charge (see chapter 16).
Replace (see chapter 2).
Inspect stick coil (see chapter 16).
Reinstall or inspect stick coil (see chapter 16).
Replace it with the correct plug (see chapter 16).
Inspect (see chapter 16).
Inspect each switch (see chapter 16).
Inspect (see chapter 16).
Inspect (see chapter 16).
Inspect and replace (see chapter 16).
Inspect and repair or replace (see chapter 2) .
Inspect and repair or replace (see chapter 16).
Inspect and replace (see chapter 16).
Clean or reinstall (see chapter 3).
Inspect and repair or replace (see chapter 3).
Change fuel. Inspect and clean fuel system (see
chapter 3).
Inspect fuel pressure and replace fuel pump (see
chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Reinstall (see chapter 16).
Tighten (see chapter 5).
Inspect and replace (see chapter 5).
Inspect and replace (see chapter 5).
Inspect and replace (see chapter 5).
Replace (see chapter 5).
Inspect and replace (see chapter 5).
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