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FUEL SYSTEM (DFI) 3-37
DFI System Troubleshooting Guide
Symptoms or Possible Causes Actions (chapter)
Fuel pressure regulator trouble Inspect fuel pressure and replace fuel pump (see
chapter 3).
Fuel line clogged Inspect and repair (see chapter 3).
Intake air pressure sensor #1 trouble Inspect (see chapter 3).
Intake air pressure sensor #2 trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Intake air temperature sensor trouble
Inspect (see chapter 3).
Main throttle sensor trouble
Inspect (see chapter 3).
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
Unstable (rough) idling:
Fuel pressure too low or too high Inspect (see chapter 3).
Fuel injector trouble
Inspect (see chapter 3).
Main throttle sensor trouble
Inspect (see chapter 3).
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
Engine vacuum not synchronizing Inspect and adjust (see chapter 2).
Intake air pressure sensor #1 trouble Inspect (see chapter 3).
Intake air pressure sensor #2 trouble Inspect (see chapter 3).
Water temperature sensor trouble
Inspect (see chapter 3).
Intake air temperature sensor trouble Inspect (see chapter 3).
Engine stalls easily:
Spark plug dirty, broken or gap maladjusted Inspect and replace (see chapter 16).
Stick coil trouble Inspect (see chapter 16).
Main throttle sensor trouble Inspect (see chapter 3).
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
Intake air pressure sensor #1 trouble Inspect (see chapter 3).
Intake air pressure sensor #2 trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Intake air temperature sensor trouble Inspect (see chapter 3).
Fuel pump trouble Inspect (see chapter 3).
Fuel injector trouble Inspect (see chapter 3).
Fuel pressure too low or too high
Inspect (see chapter 3).
Fuel pressure regulator trouble
Inspect fuel pressure and replace fuel pump (see
chapter 3).
Fuel line clogged
Inspect and repair (see chapter 3).
Poor acceleration:
Fuel pressure too low Inspect (see chapter 3).
Water or foreign matter in fuel Change fuel. Inspect and clean fuel system (see
chapter 3).
Fuel filter or pump screen clogged Inspect and replace fuel pump (see chapter 3).
Fuel pump trouble
Inspect (see chapter 3).
Fuel injector trouble
Inspect (see chapter 3).
Main throttle sensor trouble Inspect (see chapter 3).
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