Komatsu ecot3 PC300LC-8 Shop Manual page 623

40 Troubleshooting
Defective common rail pres-
5
sure sensor
Defective O-ring of supply
6
pump actuator
Possible causes
Defective supply pump actu-
and standard
7
ator
value in normal
state
Defective wiring harness
8
connector
Defective engine controller
9
ground wiring harness
10 Defective supply pump
PC300, 350-8
Cause Standard value in normal state/Remarks on troubleshooting
a
Monitoring by
machine monitor
Common rail pres-
a
a
Monitoring by
machine monitor
Common rail pres-
a
• Measured after one minute or more lapsed at idle.
Monitoring by
machine monitor
Common rail pres-
The common rail fuel pressure sensor connector and supply pump
actuator 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 (1) – chassis ground
If causes 1 – 9 are not detected, supply pump may be defective.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
While engine is
sure stopped
Directly check that O-ring of supply pump actuator is not dam-
aged.
Prepare with starting switch OFF (INSITE connection), then
turn starting switch ON and carry out troubleshooting.
While engine is
sure stopped
Prepare with starting switch OFF (INSITE connection), then
start engine and carry out troubleshooting.
During low idle
sure
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CE03 (female)
SEN02630-05
Monitoring code: 36400
0 ± 0.39 MPa
{0 ± 4 kg/cm
Monitoring code: 36400
0 ± 0.39 MPa
{0 ± 4 kg/cm
Monitoring code: 36400
1.96 MPa
{20 kg/cm
Resistance
Max. 10 z
2
}
2
}
2
}
21