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FUEL SYSTEM (DFI) 3-29

Troubleshooting the DFI System

DFI Diagnosis Flow Chart

Inquiries to Rider

○Each rider reacts to problems in different ways, so it is important to confirm what kind of symptoms the rider has encountered.

○Try to find out exactly what problem occurred under exactly what conditions by asking the rider; knowing this information may help you reproduce the problem.

○The following sample diagnosis sheet will help prevent you from overlooking any areas, and will help you decide if it is a DFI system problem, or a general engine problem.

3-30 FUEL SYSTEM (DFI)

Troubleshooting the DFI System

Sample Diagnosis Sheet

Rider name:

Registration No. (license plate No.):

Year of initial registration:

 

 

 

 

 

Model:

 

Engine No.:

 

Frame No.:

 

 

 

 

 

Date problem occurred:

 

Mileage:

 

 

 

 

 

 

Environment when problem occurred.

 

 

Weather

□fine, □ cloudy, □ rain, □ snow, □ always, □ other:

Temperature

□hot, □warm, □ cold, □ very cold, □ always, □ other:

Problem

□chronic, □ often, □once

 

 

frequency

 

 

 

 

Road

□street, □highway, □mountain road (□uphill, □downhill), □bumpy, □pebble

Altitude

□normal, □ high (about 1 000 m or more)

 

 

Motorcycle conditions when problem occurred.

 

 

Warning

□Start blinks immediately after ignition switch ON, and goes off after 1 2 seconds

indicator light

 

(normal).

 

 

(LED)

 

□Start blinks immediately after ignition switch ON, and the FI warning symbol on

 

 

the LCD starts blinking (DFI system problem).

 

□Start blinks immediately after ignition switch ON, and the immobilizer warning

 

 

symbol on the LCD starts blinking (immobilizer system problem).

 

□Does not blink after ignition switch ON.

 

 

 

□light up (ECU or meter unit replace).

 

 

Starting

□starter motor not rotating.

 

 

difficulty

□starter motor rotating but engine do not turn over.

 

□starter motor and engine do not turn over.

 

□no fuel flow (□ no fuel in tank, □ no fuel pump sound).

 

□no spark.

 

 

 

□other:

 

 

Engine stalls

□right after starting.

 

 

 

□when opening throttle grip.

 

 

 

□when closing throttle grip.

 

 

 

□when moving off.

 

 

 

□when stopping the motorcycle.

 

 

 

□when cruising.

 

 

 

□other:

 

 

Poor running

□very low idle speed, □very high idle speed, □rough idle speed.

at low speed

□battery voltage is low (charge the battery).

 

□spark plug loose (tighten it).

 

 

 

□spark plug dirty, broken, or gap maladjusted (remedy it).

 

□backfiring.

 

 

 

□afterfiring.

 

 

 

□hesitation when acceleration.

 

 

 

□engine oil viscosity too high.

 

 

 

□brake dragging.

 

 

 

□engine overheating.

 

 

 

□clutch slipping.

 

 

 

□other:

 

 

FUEL SYSTEM (DFI) 3-31

Troubleshooting the DFI System

Poor running or no power at high speed

□spark plug loose (tighten it).

□spark plug dirty, broken, or gap maladjusted (remedy it).

□spark plug incorrect (replace it).

□knocking (fuel poor quality or incorrect, → use high-octane gasoline).

□brake dragging.

□clutch slipping.

□engine overheating.

□engine oil level too high.

□engine oil viscosity too high.

□other:

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