Failure Code [Ca488] Chg Air Temp High Torque Derate; Failure Code [Ca553] Rail Press High Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA488] Chg Air Temp High Torque Derate

User code Failure code
E11
Contents of
• Temperature signal of boost pressure/temperature sensor exceeded control upper temperature limit.
trouble
Action of
• Limits output and continues operation.
controller
Problem that
appears on • Engine output lowers.
machine
Related infor- • Boost temperature can be checked with monitoring function. (Code: 18500 Boost temperature)
mation • Method of reproducing failure code: Start engine.
Lowering of cooling perfor-
1
Possible causes
mance of aftercooler
and standard
value in normal
state
Abnormal rise of turbo-
2
charger outlet temperature
3 Defective engine controller

Failure code [CA553] Rail Press High Error

Action code Failure code
E15
Contents of
• There is high pressure error (1) in common rail circuit.
trouble
Action of con-
• None in particular.
troller
Problem that
• Engine sound becomes large when no or light load is applied.
appears on
• Engine output lowers.
machine
Related infor-
• Method of reproducing failure code: Start engine.
mation
1 Defect in related system
Possible causes
and standard
Defective connection of
value in normal
2
ground terminal
state
Defective O-ring of supply
3
pump actuator
28
Trouble
CA488
Cause
Trouble
CA553
Cause
Charge air temperature high torque derate
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Cooling performance of aftercooler may be low. Check following
points directly.
• Looseness and breakage of fan belt.
• Insufficiency of cooling air
• Clogging of aftercooler fins
Outlet temperature of turbocharger may be abnormally high. Check
related parts directly.
If causes 1 – 2 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Common rail pressure high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If another failure code is displayed, carry out troubleshooting for it
first.
Ground terminal may be connected defectively. Check following ter-
minals directly.
• Ground terminal of machine ((–) terminal of battery)
• Ground terminal of engine
• Ground terminal of engine controller
• Ground terminal of starting motor
O-ring of supply pump actuator may be broken. Check it directly.
40 Troubleshooting
1
1
PC300, 350-8