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3-40 FUEL SYSTEM (DFI)
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
or crankshaft sensor trouble
(see Overheating of Troubleshooting Guide in
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 tempe
rature 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).
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