40 Troubleshooting SEN00458-01
114E-3 Series
13
S-6 Engine lacks output (or lacks power) 1
*1: Code [559/CA559] and code [2249/CA2249] in E-mode
*2: Code [122/CA122] and code [123/CA123] in E-mode
General causes why engine lacks output
q Insufficient intake of air
q Insufficient supply of fuel
q Defective spray condition of fuel
q Improper selection of fuel
q There is overheating
See “S-14 Coolant temperature becomes too high
(Overheating)“
q Controller is controlling in derate mode
(limiting injection rate (output) because of an error
in electrical system)
Causes
Clogged air cleaner element
Air leakage from air intake piping
Seized turbocharger, interference of turbocharger
Defective contact of valve and valve seat
Improper valve clearance
Worn piston ring, cylinder liner
Clogged air breather hole of fuel tank cap
Leaking, clogged fuel piping
Clogging of fuel filter
Stuck, seized supply pump plunger
Clogged injector, defective spray (dirt in injector)
Defective drive of injector (signal, solenoid)
Defective installation of boost pressure sensor (air leakage)
Defective boost pressure sensor, wiring harness
Clogged fuel spill piping
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EEEE
Power was lost
Suddenly Qw QQQQ
Gradually QQQQQQ
Non-specified fuel is being used QQQ
Replacement of filters has not been carried out according to Operation and Mainte-
nance Manual
ww
Oil must be added more frequently QQ
Dust indicator is red (if indicator is installed) ww
Air breather hole of fuel tank cap is clogged w
Fuel is leaking from fuel piping w
Output becomes insufficient after short stop of operation w
Check items
Exhaust smoke color
Black ww
Blue under light load w
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low
ww
When engine is cranked, interference sound is generated around turbocharger w
When engine is cranked, abnormal sound is generated around cylinder head w
High idle speed is too high Q
High idle speed under no load is normal, but speed suddenly drops when load is applied QwQQ
Engine does not pick up smoothly and combustion is irregular ww QQ w
There is hunting from engine (rotation is irregular) QQQ QQ
Blow-by gas is excessive ww
Troubleshooting
Inspect air cleaner directly q
Inspect air intake piping directly q
When boost pressure is measured, it is found to be low qqq
When compression pressure is measured, it is found to be low qq
Inspect valve clearance directly q
Inspect fuel piping q
Inspect fuel filter, strainer directly q
Inspect spill port check valve directly q
Carry out troubleshooting according to “No-pressure feed by supply pump (*1)” in E-
mode
q
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not
change
qq
Inspect boost pressure sensor mount directly q
Carry out troubleshooting according to “Abnormality in boost pressure sensor (*2)” in E-
mode
q
Remedy
Clean
Correct
Replace
Replace
Adjust
Replace
Clean
Correct
Replace
Replace
Replace
Replace
Correct
Replace
Replace
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