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Dfi System Troubleshooting Guide - Kawasaki KX450F Service Manual

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DFI System Troubleshooting Guide

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
Gear position switch trouble
Vehicle-down sensor OFF
Crankshaft sensor trouble
Ignition coil shorted or not in good contact
Ignition coil trouble
Spark plug dirty, broken or gap maladjusted
Spark plug incorrect
ECU ground and power supply trouble
ECU trouble
No or little fuel in tank
Fuel Injector trouble
Fuel pump not operating
Fuel filter or pump screen clogged
Fuel pressure regulator trouble
Fuel line clogged
Poor Running at Low Speed
Symptoms or Possible Causes
Spark weak:
Ignition coil shorted or not in good contact
Ignition coil trouble
Spark plug dirty, broken or gap maladjusted
Spark plug incorrect
ECU trouble
Fuel/air mixture incorrect:
Little fuel in tank
Air cleaner clogged, poorly sealed, or missing
Air cleaner duct loose
Throttle body assy holder loose
Fuel injector dust seal damage
Fuel injector O-ring damage
Fuel filter or pump screen clogged
Fuel pressure regulator trouble
Fuel line clogged
Intake air pressure sensor trouble
FUEL SYSTEM (DFI) 3-21
NOTE
Actions (chapter)
Inspect (see chapter 3).
Reinstall (see chapter 3).
Inspect (see chapter 16).
Inspect or Reinstall (see chapter 16).
Inspect (see chapter 16).
Inspect and replace (see chapter 2).
Replace it with correct plug (see chapter 2).
Inspect (see chapter 3).
Inspect (see chapter 3, 16).
Supply fuel (see Owner's Manual).
Inspect and replace (see chapter 3).
Inspect (see chapter 3).
Inspect and replace fuel pump (see chapter 3).
Inspect fuel pressure and replace fuel pump (see
chapter 3).
Inspect and repair (see chapter 3).
Actions (chapter)
Inspect or Reinstall (see chapter 16).
Inspect (see chapter 16).
Inspect and replace (see chapter 2).
Replace it with correct plug (see chapter 2).
Inspect (see chapter 3, 16).
Supply fuel (see Owner's Manual).
Clean element or inspect sealing (see chapter 3).
Reinstall (see chapter 3).
Reinstall (see chapter 3).
Replace (see chapter 3).
Replace (see chapter 3).
Inspect and replace fuel pump (see chapter 3).
Inspect fuel pressure and replace fuel pump (see
chapter 3).
Inspect and repair (see chapter 3).
Inspect (see chapter 3).

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