Service manual

3-32 FUEL SYSTEM (DFI)
DFI System Troubleshooting Guide
Symptoms or Possible Causes Actions (chapter)
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 c hapter 3).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Ignition 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 c hapter 3).
Throttle sensor malfunction Inspect (see chapter 3).
Water temperature sensor trouble
Inspect (see chapter 3).
Inlet air pressu
re 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 temper
ature 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).
Throttle sensor trouble
Inspect (see chapter 3).
Inlet air t
emperature sensor trouble
Inspect (see chapter 3).
Water temperature sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
After fire:
Crankshaft sensor trouble Inspect (see c hapter 16).
Spark plug burned or gap maladjusted Replace (see chapter 2).
Inlet ai
r temperature sensor trouble
Inspect (see chapter 3).
Water temperature 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).
Engin
e 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).