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FUEL SYSTEM (DFI) 3-37
DFI System Troubleshooting Guide
Symptoms or Possible C auses Actions (chapter)
Inlet air pressure sensor trouble Inspect (see chapter 3).
Loose injector connectors
Remedy (see chapter 3).
Crankshaft sensor trouble Inspect and repair or replace (see chapter 16).
Stick coil trouble Inspect and repair or replace (see chapter 16).
Loose terminal of battery (–) lead or engine
ground lead
Inspect and repair (see chapter 16).
Delay of ignition timing Inspect crankshaft sensor and IC igniter in ECU
(see chapter 16).
Poor acceleration:
Too low fuel pressure Inspect (see chapter 3).
Water or foreign matter in fuel Change fuel. Inspect and clean fuel system (see
chapter 3).
Clogged fuel filter or pump screen Inspect and replace fuel pump (see chapter 3).
Fuel pump trouble
Inspect (see chapter 3).
Fuel injector 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).
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
Stick coil trouble Inspect and replace (see chapter 16).
Engine oil level to high Repair (see chapter 7).
Spark plug dirty, broken or gap maladjusted Replace (see chapter 2).
Stumble:
Too low fuel pressure Inspect (see chapter 3).
Fuel injector trouble
Inspect (see chapter 3).
Main throttle sensor malfunction Inspect (see chapter 3).
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Surge:
Unstable fuel pressure Fuel pressure regulator trouble (Inspect and
replace fuel pump) or kinked fuel line (Inspect
and repair fuel line) (see chapter 3).
Fuel injector trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Backfiring when deceleration:
Spark plug dirty, broken or gap maladjusted Replace (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).
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