TROUBLESHOOTING
14-8
1.7 Low output
1.7.1 Check items before troublshooting
(1) Seizure of engine moving parts
(2) Viscosity of engine oil too high
(3) Use of poor quality fuel
(4) Clogging of air cleaner element
(5) Clogging of muffler
(6) Powertrain malfunction
1.7.2 Problem: Low output
Problem: Low output
NO
NO
NO
NO
YES
YES
YES
YES
Is fuel in the fuel line sufficient?
Adjust engine
YES
Fuel pump
Inspect fuel injection nozzles
Inspect valves, cylinder head gasket, pistons and piston rings
Inspect fuel injection pump
Does fuel including the fuel amount
in the fuel tank flow sufficiently in
the drop type?
Does fuel flow with the switch turned
ON in the electromagnetic type?
Inspect fuel filter,
fuel pipe and fuel tank
Is the engine correctly adjusted
(valve clearance and fuel injection timing)?
Are fuel injection nozzles normal
(spray state and injection-valve
opening pressure)?
Is the compression
pressure normal?
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