Komatsu PC130-7, Shop Manual

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20-444
PC130-7
TROUBLESHOOTING
E-23 Monitoring function does not display "Boom RAISE" normally
Trouble
• Monitoring function does not display
"Boom RAISE" normally.
The monitoring function (special function) of the monitor
panel does not display "Boom RAISE" normally.
Related
information
• 6-bit position of boom RAISE oil pressure switch (Code: 020, Center of lower line)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective boom RAISE oil
pressure switch
(Internal disconnection or
short circuit)
a
Prepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
S06 (male)
Right work equipment
control lever
Resistance
Between (1) and (2)
Neutral position Min. 1 M
z
Boom RAISE position Max. 1
z
2
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) (10) and
S06 (female) (1)
Resistance Max. 1
z
Wiring harness between S06 (female) (2) and
chassis ground (A16)
Resistance Max. 1
z
3
Short circuit with chassis
ground in wiring harness
(Contact with ground
circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between C03 (female) (10) – S06 (female) (1)
wiring harness and chassis ground
Resistance
Min. 1 M
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) (10) – S06 (female) (1)
wiring harness and chassis ground
Voltage Max. 1 V
5
Defective governor and
pump controller
a
Prepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
C03
Right work equipment
control lever
Voltage
Between (10) and
chassis ground
Neutral position 20 – 30 V
Boom RAISE position Max. 1 V
E-23
(1)