Komatsu PC130-7, Shop Manual, Page: 196 / 342

20-348
PC130-7
TROUBLESHOOTING
Error code [233] (Disconnection in PC-EPC solenoid)
User code Error code
Trouble
Disconnection in PC-EPC solenoid
(Governor and pump controller system)
E02 233
Contents of
trouble
• No current flows in the PC-EPC solenoid circuit.
Action of
controller
• None in particular (Since no current flows, the solenoid does not operate).
• If the cause of the failure disappears, the system resets itself.
Problem that
appears on
machine
• If the pump load increases, the engine speed lowers largely and the engine may stall (The pump ab-
sorption torque cannot be controlled).
Related
information
• The output state (current) to the PC-EPC solenoid can be checked with the monitoring function.
(Code: 013, by 10 mA)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective PC-EPC solenoid
(Internal short circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
V21 (male) Resistance
Between (1) and (2) 7 – 14
z
2
Defective emergency pump
drive switch (Internal short
circuit or disconnection)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
S25 (male)
Emergency pump drive
switch
Resistance
Between (2) and (3)
Normal Max. 1
z
Emergency Min. 1 M
z
Between (5) and (6)
Normal Max. 1
z
Emergency Min. 1 M
z
3
Disconnection in wiring
harness (Disconnection in
wiring harness or defective
contact in connector)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between C03 (female) (16) and
S25 (female) (3)
Resistance
Max. 1
z
Wiring harness between S25 (female) (2) and
V21 (female) (1)
Resistance Max. 1
z
Wiring harness between C03 (female) (3), (13),
(23) and S25 (female) (6)
Resistance Max. 1
z
Wiring harness between S25 (female) (5) and
V21 (female) (2)
Resistance
Max. 1
z
4
Short circuit with power
source in wiring harness
(Contact with 24-V circuit)
a
Prepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between C03 (female) (16) – S25 (female) (3)
wiring harness and chassis ground
Voltage Max. 1 V
Between S25 (female) (2) – V21 (female) (1)
wiring harness and chassis ground
Voltage Max. 1 V
5
Defective governor and
pump controller
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
C03 (female) Resistance
Between (16) and (3), (13),
and (23)
7 – 14
z
[233]
(1)