Code [488/Ca488] Charge Air Temp. High Torque Derate - Komatsu 114E-3 Series Shop Manual

SEN00460-01
E-41 Code [488/CA488] Charge Air Temp. High Torque Derate
Error code Failure code
488
Contents of
• Temperature signal of boost pressure sensor and temperature sensor is above upper control limit.
trouble
Action of con-
• Limits output and continues operation.
troller
Problem that
appears on • Output drops.
machine
Related infor-
• Method of reproducing failure code: Start engine.
mation
Drop in cooling performance
1
of aftercooler
Possible causes
and standard
value in normal
Abnormally high tempera-
2
state
ture at turbocharger outlet
3 Defective engine controller
28
Trouble
CA488
Causes
Derating of torque by abnormally high charge temperature
Standard value in normal state/Remarks on troubleshooting
Inspect following directly.
• Loose, broken fan belt
• Lack of cooling air
• Clogged aftercooler fin
Inspect related parts directly.
If causes 1 and 2 are not detected, engine controller may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
40 Troubleshooting
1
114E-3 Series