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FUEL SYSTEM (DFI) 3-29
DFI System Troubleshooting Guide
Symptoms or Possible Causes Actions (chapter)
Spark plug dirty, broken or gap maladjusted
Clean spark plugs and adjust plug gap (see
chapter 2).
Too low fuel pressure Inspect (see chapter 3).
Fuel pump trouble Inspect (see chapter 3).
Main throttle sensor trouble Inspect (see chapter 3).
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).
Vacuum switch 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 Adjust plug gap or replace plug (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 c hapter 3).
Run-on (dieseling) :
Ignition switch trouble Inspect and replace (see chapter 16).
Engine stop switch trouble
Inspect and repair or replace (see chapter 16).
Fuel injector trouble
Inspect (see chapter 3).
Loose terminal of battery (–) lead 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)
Vacuum switch valve trouble Inspect and replace (see chapter 5).
Air suction valve trouble
Inspect and replace (see chapter 5).
Intermittent any D FI fault and its recovery
Check that DFI connectors are clean and tight,
and examine wires for signs of burning or fraying
(see chapter 3).