Komatsu 114E-3 Series Shop Manual page 223

40 Troubleshooting
Defective O-ring of supply
6
pump actuator
Defective supply pump actua-
7
tor
Possible causes
and standard
value in normal
state
Defective wiring harness con-
8
nector
Defective wiring harness of
9
engine controller GND
10 Defective supply pump
Circuit diagram related to common rail pressure sensor and engine controller GND line
114E-3 Series
Causes
a Inspect O-ring directly for breakage.
a Prepare with starting switch OFF (connect INSITE), then turn
starting switch ON and carry out troubleshooting.
Monitoring on INSITE
Common rail pressure
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
Common rail pressure
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
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (1) (2) – chassis ground
If causes 1 – 9 are not detected, supply pump may be defective.
Standard value in normal state/Remarks on troubleshooting
Condition when
engine stopped
J3 (female)
SEN00460-01
Monitoring information
0 ± 0.39 MPa
{0 ± 4 kg/cm
Monitoring information
1.96 MPa
At low idle
{20 kg/cm
Resistance
Max. 10 z
2
}
2
}
23