Failure Code [Ca731] Eng. Bkup Speed Sensor Phase Error - Komatsu PC130-8 Shop Manual

SEN04120-03

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
24
Trouble
CA731
Cause
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].
40 Troubleshooting
1
PC130-8