3-28 FUEL SYSTEM (DFI)
Troubleshooting the DFI System
Sample Diagnosis Sheet
Rider name:
Registration No. (license plate No.):
Model:
Engine No.:
Date problem occurred:
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Weather
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Temperature
Problem
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frequency
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Road
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Altitude
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FI indicator
LED light
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Starting
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difficulty
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Engine stops
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Poor running
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at low speed
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Environment when problem occurred.
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fine,
cloudy,
rain,
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hot,
warm,
cold,
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chronic,
often,
once
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street,
highway,
mountain road (
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normal,
high (about 1 000 m or more)
Motorcycle conditions when problem occurred.
light up immediately after ignition SW ON, and goes off after engine oil
pressure is high enough (with engine running) (normal).
lights up immediately after ignition SW ON, and stays on after engine oil
pressure is high enough (with engine running) (DFI problem)
lights up immediately after ignition SW ON, but goes off after about 10 seconds
though engine oil pressure is high enough (with engine running) (DFI problem).
unlights (LED light, ECU or its wiring fault).
sometimes lights up (probably wiring fault).
starter motor not rotating.
starter motor rotating but engine doesn't turn over.
starter motor and engine don't turn over.
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no fuel flow (
no fuel in tank,
engine flooded (do not crank engine with throttle opened, which promotes
engine flooding).
no spark.
choke knob is not pulled fully when using the knob (pull it fully when using).
other:
right after starting.
when opening throttle grip.
when closing throttle grip.
when moving off.
when stopping the motorcycle.
when cruising.
other:
choke knob left pulled out fully (push it in fully).
very low fast idle speed.
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very low idle speed,
battery voltage is low (charge the battery).
spark plug loose (tighten it).
spark plug dirty, broken, or gap maladjusted (adjust it).
backfiring.
afterfiring.
hesitation when acceleration.
engine oil viscosity too high.
brake dragging.
engine overheating.
clutch slipping.
other:
Year of initial registration:
Frame No.:
Mileage:
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snow,
always,
other:
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very cold,
always
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uphill,
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no fuel pump sound).
very high idle speed,
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downhill),
bumpy,
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rough idle speed.
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pebble
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