Komatsu ecot3 PC300LC-8 Shop Manual page 635

40 Troubleshooting
Short circuit in wiring har-
8 ness
(with another wiring harness)
Possible causes
and standard
value in normal
state
Defective wiring harness
9
connector
10 Defective engine controller
Circuit diagram related to engine Ne speed sensor
PC300, 350-8
Cause Standard value in normal state/Remarks on troubleshooting
a
Wiring harness between CE01 (female) (27)
– C15 (female) (3) and between CE01
(female) (16) – C15 (female) (1)
Wiring harness between CE01 (female) (27)
– C15 (female) (3) and between CE01
(female) (48) – C15 (female) (2)
Connecting parts between engine Ne speed sensor – engine wiring
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 (16) – (48)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01
Power supply
SEN02630-05
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
Voltage
4.75 – 5.25 V
33