Fuel Consumption Is Excessive - Komatsu PC200-8M0 Shop Manual

600 Troubleshooting of engine (S-mode)
S-10 Fuel consumption is excessive
S-10 Fuel consumption is excessive
General causes why fuel consumption is excessive
q
Leakage of fuel
q
Improper fuel injection (fuel pressure or injection timing)
q
Excessive injection of fuel
Check recent repair history.
Machine opera-
Operated for long period
tion hours
is more than that on other machines of same model.
Fuel consump-
Gradually increased.
tion:
Suddenly increased.
External leakage of fuel from engine
Combustion is irregular.
Engine oil level rises and oil smells of diesel fuel.
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low.
Low idle speed is high.
Pump relief speed is high.
Black
Color of exhaust
smoke
White
Remove head cover and check for fuel leak.
Check oil seal of feed pump.
Perform troubleshooting for "Supply pump pressure low error" according to failure code
(*1).
When a certain cylinder is cut out, engine speed does not change.
Too much fuel is returned from injector.
Perform troubleshooting for "Coolant sensor error" according to failure code (*2).
Check the condition by using monitoring function of machine monitor.
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA144] and [CA145]
PC200, 200LC, 220, 220LC-8M0
SEN06140-00
Cause
E E E
Q
Q Q
Q Q
w
w
w w
w
Q Q
Q
q
q
q
q
q
Remedy
40-600
Q Q Q
Q
Q
Q Q
q
q
q
17