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: