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3-38 FUEL SYSTEM (DFI)
DFI System Troubleshooting Guide
Symptoms or Possible Causes Actions (chapter)
Inlet air pressure sensor trouble Inspect (see chapter 3).
Air switching valve broken Inspect and replace (see chapter 5).
Air suction valve trouble Inspect and replace (see chapter 5).
After fire:
Crankshaft sensor trouble Inspect (see chapter 16).
Spark plug burned or gap maladjusted Replace (see chapter 2).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Atmospheric pressure sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Fuel injector trouble
Inspect (see chapter 3).
Run-on (dieseling):
Ignition switch trouble Inspect and replace (see chapter 16).
Engine stop switch trouble Inspect and repair or replace (see chapter 2).
Fuel injector trouble Inspect (see chapter 3).
Loose terminal of battery (–) cable or ECU
ground lead
Inspect and repair (see chapter 16).
Carbon accumulating on valve seating surface Repair (see chapter 5).
Engine overheating (see Overheating of Troubleshooting Guide, see
chapter 17)
Other:
Engine oil viscosity too high Change (see chapter 2).
Drive train trouble
Inspect drive chain (see chapter 2) and sprocket
(see chapter 11).
Brake dragging Inspect caliper fluid seal damage or clogging
of master cylinder relief and supply ports (see
chapter 12).
Clutch slipping Inspect friction plates for wear (see chapter 6).
Engine overheating (see Overheating of Troubleshooting Guide, see
chapter 17)
Air switching valve trouble Inspect and replace (see chapter 5).
Air suction valve trouble Inspect and replace (see chapter 5).
Intermittent any DFI fault and its recovery Check that DFI connectors are clean and tight,
and examine wires for signs of burning or fraying
(see chapter 3).
Poor Running or No Power at High Speed:
Symptoms or Possible Causes Actions (chapter)
Firing incorrect:
Spark plug dirty, broken or maladjusted Replace (see chapter 2).
Spark plug cap trouble Inspect stick coil (see chapter 16).
Spark plug cap shorted or not in good contact Reinstall or inspect stick coil (see chapter 16).
Spark plug incorrect Replace it with the correct plug (see chapter 16).
IC igniter in ECU trouble Inspect (see chapter 16).
Crankshaft sensor trouble Inspect (see chapter 16).
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