Service Manual — page 129 of 715

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FUEL SYSTEM (DFI) 3-39
DFI System Troubleshooting Guide

        Symptoms or Possible Causes                           Actions (chapter)
Intake air temperature sensor trouble          Inspect (see chapter 3).
Miscellaneous:
Subthrottle sensor trouble                    Inspect (see chapter 3).
Subthrottle valve actuator trouble            Inspect (see chapter 3).
Throttle valves will not fully open           Inspect throttle cables and lever linkage (see
                                              chapter 3).
Engine overheating - Water temperature sensor (see Overheating of Troubleshooting Guide in
or crankshaft sensor trouble                  chapter 17)
Air switching valve trouble                   Inspect and replace (see chapter 16).
Air suction valve trouble                     Inspect and replace (see chapter 5).
Exhaust Smokes Excessively:
(Black smoke)
Air cleaner element clogged                   Clean element (see chapter 2).
Fuel pressure too high                        Inspect (see chapter 3).
Fuel injector trouble                         Inspect (see chapter 3).
Water temperature sensor trouble              Inspect (see chapter 3).
Intake air temperature sensor trouble         Inspect (see chapter 3).
(Brown smoke)
Air duct loose                                Reinstall (see chapter 3).
Fuel pressure too low                         Inspect (see chapter 3).
Water temperature sensor trouble              Inspect (see chapter 3).
Intake air temperature sensor trouble         Inspect (see chapter 3).