Service Manual (KLZ1000C) — page 119 of 762

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FUEL SYSTEM (DFI) 3-35
DFI System Troubleshooting Guide

        Symptoms or Possible Causes                             Actions (chapter)
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:
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).
Water or foreign matter in fuel                  Change fuel. Inspect and clean fuel system (see
                                                 chapter 3).
Fuel injector O-ring damage                      Replace (see chapter 3).
Fuel injector clogged                            Inspect and repair (see chapter 3).
Fuel line clogged                                Inspect and repair (see chapter 3).
Fuel pump operates intermittently and often DFI Fuel pump bearings may wear. Replace the fuel
fuse blows.                                      pump (see chapter 3).
Fuel pump trouble                                Inspect (see chapter 3).
Intake air pressure sensor #1 or #2 trouble      Inspect (see chapter 17).
Cracked or obstructed intake air pressure sensor Inspect and repair or replace (see chapter 17).
#1 or #2 vacuum hose
Water temperature sensor trouble                 Inspect (see chapter 17).
Intake air temperature senor trouble             Inspect (see chapter 17).
Accelerator position sensor trouble              Inspect (see chapter 17).
Throttle position sensor trouble                 Inspect (see chapter 17).
ETV actuator trouble                             Inspect (see chapter 17).
Knocking:
Fuel poor quality or incorrect                   Fuel change (Use the gasoline recommended in
                                                 the chapter 1 General Specifications).
Spark plug incorrect                             Replace it with the correct plug (see chapter 2).
Stick coil trouble                               Inspect (see chapter 16).
ECU trouble                                      Inspect (see chapter 3).
Engine vacuum not synchronizing                  Inspect and adjust (see chapter 2).
Intake air pressure sensor #1 or #2 trouble      Inspect (see chapter 17).
Water temperature sensor trouble                 Inspect (see chapter 17).
Intake air temperature senor trouble             Inspect (see chapter 17).
Miscellaneous:
Throttle valves will not fully open              Inspect ETV system (see chapter 17).
Engine overheating - Water temperature sensor (see Overheating of Troubleshooting Guide in
or crankshaft sensor trouble                     chapter 18)
Air switching valve trouble                      Inspect and replace (see chapter 16).
Air suction valve trouble                        Inspect and replace (see chapter 5).
Exhaust Smokes Excessively:
(Black smokes)
Air cleaner element clogged                      Clean element (see chapter 2).
Fuel pressure too high                           Inspect (see chapter 3).