Service Manual (KLZ1000C) — page 116 of 762

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3-32 FUEL SYSTEM (DFI)
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, ETV 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)
Gear position sensor, starter lockout or side     Inspect each switch or sensor (see chapter 16
stand switch trouble                              or 17).
Immobilizer system trouble                        Inspect (see chapter 17).
Vehicle-down sensor operated                      Turn ignition switch off (see chapter 17).
Vehicle-down sensor trouble                       Inspect (see chapter 17).
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 17).
Fuel pump not operating                           Inspect (see chapter 3).
Fuel pump relay trouble                           Inspect and replace (see chapter 17).
Fuel filter clogged                               Replace fuel filter (see chapter 2).
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 5).
Throttle body assy dust seal damage               Replace (see chapter 3).
Fuel injector O-ring damage                       Replace (see chapter 3).
Fuel filter clogged                               Replace fuel filter (see chapter 2).