Service Manual (KLZ1000C) — page 118 of 762

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3-34 FUEL SYSTEM (DFI)
DFI System Troubleshooting Guide

        Symptoms or Possible Causes                          Actions (chapter)
Intake air temperature senor trouble          Inspect (see chapter 17).
Spark plug dirty, broken or gap maladjusted   Inspect and replace (see chapter 2).
Stick coil trouble                            Inspect (see chapter 16).
Stumble:
Fuel pressure too low                         Inspect (see chapter 3).
Fuel injector 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).
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).
Surge:
Unstable fuel pressure                        Fuel pressure regulator trouble (Inspect and
                                              replace fuel pump) or kinked fuel line (Inspect
                                              and replace fuel pump) (see chapter 3).
Fuel injector trouble                         Inspect (see chapter 17).
Water temperature sensor trouble              Inspect (see chapter 17).
Backfiring when deceleration:
Spark plug dirty, broken or gap maladjusted   Inspect and replace (see chapter 2).
Fuel pressure too low                         Inspect (see chapter 3).
Fuel pump trouble                             Inspect (see chapter 3).
Accelerator position sensor trouble           Inspect (see chapter 17).
Throttle position sensor trouble              Inspect (see chapter 17).
ETV actuator trouble                          Inspect (see chapter 17).
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).
Air switching valve trouble                   Inspect and replace (see chapter 16).
Air suction valve trouble                     Inspect and replace (see chapter 5).
After fire:
Spark plug burned or gap maladjusted          Replace (see chapter 2).
Fuel injector trouble                         Inspect (see chapter 17).
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).
Other:
Intermittent any DFI fault and its recovery   Check that DFI connectors are clean and tight,
                                              and examine leads for signs of burning or fraying
                                              (see chapter 17).

Poor Running or No Power at High Speed:
        Symptoms or Possible Causes                          Actions (chapter)
Firing incorrect:
Stick coil shorted or not in good contact     Inspect or reinstall (see chapter 16).