Komatsu Galeo BR380JG-1E0 Shop Manual page 695

40 Troubleshooting
Defective battery relay
(Disconnection or
8
defective tightening of
terminal)
Disconnection in wiring
harness (Disconnec-
9 tion in wiring or defec-
tive contact in
connector)
Possible
causes and
standard value
in normal state
Ground fault in wiring
10 harness (Short circuit
with GND circuit)
Hot short (Short circuit
11 with 24V circuit) in wir-
ing harness
BR380JG-1E0
Cause
a Prepare with starting switch OFF, then turn starting switch ON and carry
out troubleshooting.
Battery relay
Between battery relay
terminal M and chassis
a Prepare with starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Wiring harness between starting switch C – R01
(male) (6)
Wiring harness between R01 (female) (3) – A07
(2) – E09 (female) (1)
Wiring harness between battery (+) – battery
relay B – E02 (female) (1)
Wiring harness between starting motor safety
relay B – heater relay – battery relay M
Wiring harness between starting motor safety
relay E – chassis ground
Wiring harness between starting motor safety
relay C – starting motor C (SC)
Wiring harness between E02 (female) (2) – A09
(4) (5) – B28 (1) (power supply side)
Wiring harness between B28 (1) – starting switch
B
Wiring harness between starting switch BR –
A07 (5) – battery relay BR
Wiring harness between battery relay M – start-
ing motor B (SB)
a Prepare with starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Wiring harness between starting switch C – R01
(female) (6)
Wiring harness between R01 (female) (3) – A07
(2) – E09 (female) (1)
Wiring harness between R01 (female) (2) – P02
(female) (14)
Wiring harness between starting motor safety
relay B – heater relay – battery relay M
Wiring harness between starting motor safety
relay C – starting motor C (SC)
Wiring harness between battery (+) – battery
relay B – E02 – A09 (1) (2) (3) – B28 (1) (power
supply side)
Wiring harness between B28 (1) – starting switch
B
Wiring harness between starting switch BR –
A07 (5) – battery relay BR
a Prepare with starting switch OFF, then turn starting switch ON and carry
out troubleshooting.
Wiring harness between E09 (female) (2) – alter-
nator L, – circuit branch end
Standard value in normal state/Remarks on troubleshooting
Starting switch
ground
SEN02095-00
Voltage
OFF
ON 20 – 30 V
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Max. 1 z
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Voltage
0 V
Max. 1 V
5