Komatsu ecot3 PC300LC-8 Shop Manual page 641

40 Troubleshooting
Defective wiring harness
9
Possible causes
connector
and standard
value in normal
state
10 Defective engine controller
Circuit diagram related to engine Bkup speed sensor
PC300, 350-8
Cause Standard value in normal state/Remarks on troubleshooting
Connecting parts between engine Bkup speed sensor – engine wir-
ing harness – engine controller may be defective. Check them
directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a
Between (37) – (47)
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01
Power supply
SEN02630-05
Voltage
4.75 – 5.25 V
39