Service manual

FUEL SYSTEM (DFI) 3-33
DFI System Troubleshooting Guide
Symptoms or Possible Causes Actions (chapter)
Engine overheating (see Overheating of Troubleshooting Guide, see
chapter 17)
Other:
Engine oil viscosity too high Change (see chapter 2).
Brake dragging Inspect caliper fluid seal damage or clogging
of master cylinder relief and supply ports (see
chapter 12).
Engine overheating
(see Overheating of Troubleshooting Guide, see
chapter 17)
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).
Ignition coil trouble
Inspect ignition coil (see chapter 16).
Ignition coil shorted or not in good contact Reinstall or inspect ignition 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).
Ignition coil trouble
Inspect (see chapter 16).
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed, or missing Clean element or inspect sealing (see chapter 3).
Air cleaner duct loose Reinstall (see chapter 3).
Air cleaner O-ring damaged Replace (see chapter 3).
Water or foreign matter in fuel Change fuel. Inspect and clean fuel system (see
chapter 3).
Throttle body assy loose Reinstall (see chapter 3).
Fuel tank air vent obstructed Inspect and repair (see chapter 3).
Fuel line clogged Inspect and repair (see chapter 3).
Fuel pump operates intermittently and often DFI
fuse blows.
Pump bearings may wear. Replace the pump
(see chapter 3).
Fuel pump trouble Inspect (see chapter 3).
Inlet air temperature sensor trouble
Inspect (see chapter 3).
Throttle sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Cracked or obstructed inlet air pressure sensor
hose
Inspect and repair or replace (see chapter 3).
Injector clogged Visually inspect and replace (see chapter 3).
Compression low:
Spark plug loose Reinstall (see chapter 16).
Cylinder head not sufficiently tightened down Ti ghten (see chapter 5).
No valve clearance
Adjust (see chapter 2).
Cylinder, piston worn Inspect and replace (see chapter 5).