3-26 FUEL SYSTEM (DFI)
DFI System Troubleshooting Guide
Symptoms or Possible Causes
Fuel pump trouble
Intake air pressure sensor trouble
Cracked or obstructed intake air pressure sensor
vacuum hose
Water temperature sensor trouble
Throttle sensor trouble
Knocking:
Fuel poor quality or incorrect
Spark plug incorrect
Ignition coil trouble
ECU trouble
Intake air pressure sensor trouble
Water temperature sensor trouble
Miscellaneous:
Throttle valves will not fully open
Engine overheating - Water temperature sensor
or crankshaft sensor trouble
Exhaust Smokes Excessively:
(Black smokes)
Air cleaner clogged
Fuel pressure too high
Fuel injector trouble
Water temperature sensor trouble
(Brown smoke)
Air duct loose
Fuel pressure too low
Water temperature sensor trouble
Actions (chapter)
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect and repair or replace (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Fuel change (Use the gasoline recommended in
the Owner's Manual).
Replace it with the correct plug (see chapter 2).
Inspect (see chapter 16).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect throttle cables and lever linkage (see
chapter 3).
(see Overheating of Troubleshooting Guide in
chapter 17).
Clean element (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
Reinstall (see chapter 3).
Inspect (see chapter 3).
Inspect (see chapter 3).
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