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FUEL SYSTEM (DFI) 3-31
DFI System Troubleshooting Guide
NOTE
○
This is not an exhaustive list, giving every possible cause for each problem listed. It is meant
simply as a rough guide to assist the troubleshooting for some of the more common difficulties in
DFI system.
○
The ECU may be involved in the DFI electrical and ignition system troubles. If these parts and
circuits are checked out good, be sure to check the ECU for ground and power supply. If the
ground and power supply are checked good, replace the ECU.
Engine Won’t Turn Over
Symptoms or Possible Causes Actions (chapter)
Neutral, starter lockout or sidestand switch
trouble
Inspect each switch (see chapter 16).
Immobilizer system trouble
Inspect (see chapter 3).
Vehicle-down sensor operated
Turn ignition switch OFF (see chapter 3).
Vehicle-down sensor trouble Inspect (see chapter 3).
Crankshaft sensor trouble Inspect (see chapter 16).
Stick coil shorted or not in good contact Inspect or Reinstall (see chapter 16).
Stick coil trouble Inspect (see chapter 16).
Spark plug dirty, broken or gap maladjusted Inspect and replace (see chapter 2).
Spark plug incorrect Replace it with the correct plug (see chapter 2).
ECU ground and power supply trouble Inspect (see chapter 3).
ECU trouble Inspect (see chapter 3).
No or little fuel in tank Supply fuel (see Owner’s Manual).
Fuel injector trouble Inspect and replace (see chapter 3).
Fuel pump not operating
Inspect (see chapter 3).
Fuel pump relay trouble
Inspect and replace (see chapter 16).
Fuel filter or pump screen clogged Inspect and replace fuel pump (see chapter 3).
Fuel pressure regulator trouble Inspect fuel pressure and replace fuel pump (see
chapter 3).
Fuel line clogged Inspect and repair (see chapter 3).
Poor Running at Low Speed
Symptoms or Possible Causes Actions (chapter)
Spark weak:
Stick coil shorted or not in good contact Inspect or reinstall (see chapter 16).
Stick coil trouble Inspect (see chapter 16).
Spark plug dirty, broken or gap maladjusted Inspect and replace (see chapter 2).
Spark plug incorrect Replace it with the correct plug (see chapter 2).
ECU trouble Inspect (see chapter 3).
Fuel/air mixture incorrect:
Little fuel in tank Supply fuel (see Owner’s Manual).
Air cleaner clogged, poorly sealed, or missing
Clean element or inspect sealing (see chapter 2).
Air duct loose Reinstall (see chapter 3).
Throttle body assy holder loose Reinstall (see chapter 3).
Throttle body assy dust seal damage Replace (see chapter 3).
Fuel injector O-ring damage Replace (see chapter 3).
Fuel filter or pump screen clogged Inspect and replace fuel pump (see chapter 3).
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