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G20, 30, 40 SIIIA Operation & Maintenance Manual
ENGINE TROUBLESHOOTING
This item contains a simple troubleshooting. When a failure takes place on your engine, diagnose the cause referring this
troubleshooting. Should the cause of failure not be detected or you are unable to manage the failure, consult your
machine supply source or nearest company engine service outlet.
A connector is provided at an end of the harness of the driven machine so that the diagnosis tool can be loaded with data
from the E-ECU.
Engine does not start
Starter does not turn.
Battery discharged
Bad cable connections.
Starter or starter switch failure.
Safety relay failure.
Starter turns but engine
does not fire.
No fuel injection.
No fuel in the fuel tank.
Clogged fuel filter element.
Air in the fuel system.
Control rack is stuck at no
fuel position.
Fuel is injected but engine
does not fire.
Incorrect preheating
operation.
Faulty air heater.
Incorrect injection timing.
Low cylinder compression
pressure.
Engine fires but stalls
immediately.
Air in the fuel system.
Unstable engine running
Unstable low idling
Crack in injection pipe.
Injection nozzle failure.
Uneven compression pressure between cylinders.
Incorrect high idle speed
adjustment.
Software/Electronic malfunction
Engine hunting in medium
speed range.
Software/Electronic malfunction
Engine malfunction in high
speed range.
Insufficient fuel supply.
Air in the fuel system
Clogged fuel filter element
Piping failure (squeezed/
restricted etc.)
Uneven fuel injection amount between cylinders.
Incorrect valve clearance adjustment.
Deteriorated valve spring.
Engine speed stuck at high
idle.
Engine control restriction or seizure.
Summary of Contents for G20 SIIIA
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