Komatsu Galeo PC138US-8 Shop Manual page 665

SEN02467-00
Defective alternator (Internal
8
short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
9
or defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
10 ness (Short circuit with GND
circuit)
Hot short (Short circuit with
11
24V circuit) in wiring harness
10
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then turn starting switch ON
Between L (AR-1) –
chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between H15 (male) (4) –
R06 (female) (5)
Wiring harness between R06 (female) (3) –
R07 (female) (4)
Wiring harness between R07 (female) (3) –
R17 (female) (1)
Wiring harness between starting motor
safety relay B – heater relay – battery relay
B
Wiring harness between starting motor
safety relay E – chassis ground
Wiring harness between starting motor
safety relay C – starting motor C (E10)
Wiring harness between F01-20 – S14
(male) (1)
Wiring harness between S14 (male) (3) –
R06 (female) (1)
Wiring harness between R06 (female) (2) –
J02 – chassis ground (T08)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between H15 (male) (4) –
R06 (female) (5), – circuit branch end
Wiring harness between R06 (female) (3) –
R07 (female) (4)
Wiring harness between R07 (female) (3) –
R17 (female) (1)
Wiring harness between starting motor
safety relay B – heater relay – battery relay
B
Wiring harness between starting motor
safety relay C – starting motor C (E10)
Wiring harness between F01-20 – S14
(male) (1)
Wiring harness between S14 (male) (3) –
R06 (female) (1)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between R17 (female) (2) –
alternator L (AR-1), – circuit branch end
and carry out troubleshooting.
Alternator
Generation output
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
40 Troubleshooting
Voltage
Max. 1 V
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-
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
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 1 V
PC138US, USLC-8