Failure Code [Ca731] Eng. Bkup Speed Sensor Phase Error; Failure Code [Ca757] All Persistent Data Lost Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02464-01

Failure code [CA731] Eng. Bkup speed sensor phase error

User code Failure code
E15
Contents of
• Engine Bkup speed sensor circuit detected abnormality in phase.
trouble
Action of
• Controls with signals of engine Ne speed sensor.
controller
Problem that
• Running engine stops (when Ne speed sensor is also abnormal).
appears on
• Stopped engine cannot be started (when Ne speed sensor is also abnormal).
machine
Related
• Method of reproducing failure code: Start engine.
information
Possible causes
Defective engine Ne speed
and standard 1
sensor system
value in normal
Defective engine Bkup
state
2
speed sensor system

Failure code [CA757] All persistent data lost error

User code Failure code
E10
Contents of
• All data in engine controller are lost.
trouble
Action of
• None in particular.
controller
Problem that
appears on
• Engine continues operation normally, but it may stop during operation or may not be able to start.
machine
Related
• Method of reproducing failure code: Turn starting switch ON.
information
Possible causes
and standard
value in normal
state
22
Trouble
CA731
Cause
Trouble
CA757
Cause
Carry out troubleshooting for failure code [CA111].
Eng. Bkup speed sensor phase error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Engine Ne speed sensor may be defective. Carry out trouble-
shooting for failure code [CA698].
Engine Bkup speed sensor may be defective. Carry out trouble-
shooting for failure code [CA778].
All persistent data lost error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
40 Troubleshooting
1
1
PC138US, USLC-8