Komatsu 114E-3 Series, Руководство по ремонту, Страница: 223 / 342

40 Troubleshooting SEN00460-01
114E-3 Series
23
Circuit diagram related to common rail pressure sensor and engine controller GND line
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
6
Defective O-ring of supply
pump actuator
a
Inspect O-ring directly for breakage.
7
Defective supply pump actua-
tor
a
Prepare with starting switch OFF (connect INSITE), then turn
starting switch ON and carry out troubleshooting.
Monitoring on INSITE Monitoring information
Common rail pressure
Condition when
engine stopped
0 ± 0.39 MPa
{0 ± 4 kg/cm 2 }
a
Prepare with starting switch OFF (connect INSITE), then start
engine and carry out troubleshooting.
• Measure after running engine at idle at least 1 minute.
Monitoring on INSITE Monitoring information
Common rail pressure At low idle
1.96 MPa
{20 kg/cm
2
}
8
Defective wiring harness con-
nector
Connection of common rail fuel pressure sensor connector or supply
pump actuator is suspected. Inspect it directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
9
Defective wiring harness of
engine controller GND
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
J3 (female) Resistance
Between (1) (2) – chassis ground Max. 10
z
10 Defective supply pump If causes 1 – 9 are not detected, supply pump may be defective.