3-26 FUEL SYSTEM (EFI)
Symptoms or Possible Causes Actions (chapter)
Inlet air temperature sensor trouble Inspect (see chapter 3).
Coolant temperature sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Fuel injector trouble Inspect (see chapter 3).
Run-on (dieseling):
Ignition switch trouble Inspect and replace (see chapter 16).
Engine 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).
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)
Air switching valve trouble Inspect and replace (see chapter 5).
Air suction valve trouble Inspect and replace (see chapter 5).
Intermittent any EFI fault and its recovery Check that EFI 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).
Stick coil trouble Inspect stick coil (see chapter 16).
Stick coil shorted or not in good contact Reinstall or inspect stick 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).
Stick 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).
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