Error Code [203] (Short Circuit In Swing Holding Brake Solenoid) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [203] (Short circuit in swing holding brake solenoid)

User code Error code
E03 203
Contents of
• When the signal is output to the swing holding brake solenoid circuit, an abnormal current flows.
trouble
• Turns the output to the swing holding brake solenoid circuit OFF.
Action of
• Even if the cause of the failure disappears, the system does not reset itself until the starting switch is
controller
turned OFF.
Problem that
appears on • The machine cannot swing (The swing holding brake is not released).
machine
• The operation state (ON/OFF) of the swing holding brake solenoid can be checked with the monitoring
function. (Code: 023, Center of upper line)
Related
• If the solenoid and wiring harness are normal, the machine can swing by setting the swing holding brake
information
release switch in the FREE position. (The swing holding brake does not operate when the machine
stops swinging, however.)
Defective swing holding
1 brake solenoid (Internal
short circuit)
Possible causes
Short circuit with chassis
and standard
ground in wiring harness
2
value in normal
(Contact with ground cir-
state
cuit)
Defective governor and
3
pump controller
20-322
(1)
Short circuit in swing holding brake solenoid
Trouble
(Governor and pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between (2) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between C03 (female) (37) – D01 – J02 – X05
– V05 (female) (1) or S25 (female) (8) wiring
harness and chassis ground
aPrepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
Between (37) and
chassis ground
V05 (male)
Between (1) and (2)
Left work equipment
C03
control lever
Neutral position
Swing position
[203]
Resistance
20 – 60 z
Min. 1 Mz
Resistance Min. 1 Mz
Voltage
Max. 1 V
20 – 30 V
PC130-7