Failure Code [Dxa0Ka] Pc-Epc Sol. Open Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DXA0KA] PC-EPC Sol. Open Circuit

Action code Failure code
E02 DXA0KA
Contents of
• No current flows to PC-EPC solenoid circuit.
trouble
Action of con- • None in particular. (Since no current flows, solenoid does not operate.)
troller • If cause of failure disappears, system resets itself.
Problem that
appears on • If pump load increases, engine speed lowers largely and engine may stall.
machine
• Output to PC-EPC solenoid (current value) can be checked with monitoring function.
(Code 01300: PC-EPC solenoid current)
Related infor-
• If solenoid and wiring harness are not defective, turn emergency drive switch on; the operator can
mation
operate the machine with output equivalent to E-mode. (Failure code [DXA0KA] is then displayed,
but it is not defective.)
Defective PC-EPC solenoid
1
(Internal disconnection)
Defective emergency pump
2 drive switch (Internal discon-
nection)
Possible causes
Disconnection in wiring har-
and standard
ness
value in normal
3 (Disconnection in wiring or
state
defective contact in connec-
tor)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective pump controller
42
PC-EPC solenoid disconnection
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
a
Between (2) – (3)
Between (5) – (6)
a
Wiring harness between CP02 (female) (96)
– S21 (3)
Wiring harness between S21 (2) – V11
(female) (1)
Wiring harness between CP02 (female)
(115), (117), (120) – chassis ground
Wiring harness between S21 (5) – V11
(female) (2)
a
Wiring harness between CP02 (female) (96)
– S21 (3) and chassis ground
Wiring harness between S21 (2) – V11
(female) (1) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V11 (male)
Between (1) – (2)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
S21
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.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP02 (female)
Between (96) –
(115), (117), (120)
40 Troubleshooting
Resistance
7 – 14 z
Switch Resistance
Max. 1 z
OFF
ON Min. 1 Mz
Max. 1 z
OFF
ON Min. 1 Mz
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Voltage
Resistance
7 – 14 z
PC300, 350-8
1
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 V
Max. 1 V