Failure Code [Ca488] Derating Of Torque By Abnormally High Charge Temperature - Komatsu WA250-6 Shop Manual

SEN03843-00
Failure code [CA488] Derating of torque by abnormally high charge
temperature
Action code Failure code
E03
Contents of
• Temperature signal of boost pressure sensor and temperature sensor is above upper control limit.
trouble
Action of • Limits output and continues operation.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
• Engine output drops.
machine
• The input state (boost temperature) from the boost pressure and temperature sensors can be
checked with the monitoring function (Code: ENGINE, 18500, CHG TEMP).
Related
• The input state (boost temperature sensor voltage) from the boost pressure and temperature sen-
information
sors can be checked with the monitoring function (Code: ENGINE, 18501, CHG TEMP).
• Method of reproducing failure code: Start engine
Drop in cooling performance
1
Possible causes
of aftercooler
and standard
value in normal
Abnormally high tempera-
state
2
ture at turbocharger outlet
3 Defective engine controller
28
40-330

Failure code [CA488] Derating of torque by abnormally high charge temperature

Trouble
CA488
Causes
330 Troubleshooting by failure code (Display of code), Part 3
Derating of torque by abnormally high charge temperature
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Inspect following directly.
• Malfunction of hydraulic drive fan
• Insufficient cooling air
• Clogged aftercooler fin
Inspect 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.)
1
WA250, 250PZ-6