When Starting Switch Turned On, Machine Monitor Displays Nothing - Komatsu PC130-8 Shop Manual

SEN04123-01
E-1 When starting switch turned ON, machine monitor displays nothing
Trouble

• When starting switch turned ON, machine monitor displays nothing.

• When starting switch is turned ON, machine monitor displays KOMATSU logo, screen to input pass-
word (if set), screen to check breaker mode (if set), screen of check before starting, screen to check
Related infor-
working mode and travel speed, and ordinary screen in order.
mation
• When the engine is started, the battery voltage may lower suddenly, depending on the ambient tem-
perature and the condition of the battery.
1 Low charge level of battery
Defective fusible link F05 or
2
fuse No. 17
Wrong connection of connec-
3
tor
Disconnection in wiring har-
ness (Disconnection in wiring
4
or defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
5 ness (Short circuit with GND
circuit)
6 Defective machine monitor
6
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Battery voltage (2 pieces)
If fusible link or fuse is broken, circuit probably has ground fault.
(See Cause 5.)
Machine monitor connector may be connected wrongly. Check it
directly. (Check mounting bracket plate with connector.)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between battery (–) – chas-
sis ground
Wiring harness between battery (+) – R04 –
F05 (male) (1)
Wiring harness between F05 (male) (2) –
F01-16D
Wiring harness between F01-17 – J06 –
CM01 (female) (1), (2)
Wiring harness between CM01 (female) (3),
(4) – chassis ground (T05)
Wiring harness between F01-17 – J06 –
H15 (female) (1)
Wiring harness between H15 (female) (5) –
J03 – CM01 (female) (14)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between battery (+) – R04 –
F05 (male) (1) and chassis ground
Wiring harness between F05 (male) (2) –
F01-16D and chassis ground
Wiring harness between F01-17 – J06 –
CM01 (female) (1), (2) and chassis ground
Wiring harness between F01-17 – J06 –
H15 (female) (1) and chassis ground
Wiring harness between H15 (female) (5) –
J03 – CM01 (female) (14) and chassis
ground
a Prepare with starting switch OFF, then hold starting switch OFF
and ON and carry out troubleshooting in each case.
(1), (2) – (3), (4)
(14) – (3), (4)
Min. 24 V
CM01 Starting switch
Between
OFF
Between
ON
40 Troubleshooting
Electrolyte specific gravity
(1 piece)
Min. 1.26
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
20 – 30 V
20 – 30 V
PC130-8
1