Komatsu Galeo PC800-8 Shop Manual page 788

SEN00793-02
Failure
• Step light does not light up or go off.
phenomenon
Relative
information
Defective step light switch
1
(Internal disconnection)
Defective step light relay
2
(Internal defect)
Short-circuiting of wiring
Possible causes
3 harness
and standard
(Contact with 24 V circuit)
value in normal
state
Defective pump controller
(Step light switch input sys-
tem)
4
Defective pump controller
(Step light relay output sys-
tem)
62
Cause Standard value in normalcy and references for troubleshooting
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (1) – (2)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Replace the step light relay with another one. If trouble is
repaired, the relay is defective.
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Wiring harness between S13 (female) (1) – J06 –
CP01 (female) (24) or between S13 (female) (1) –
D03 (female) (8) and chassis ground
Wiring harness between CP02 (female) (19) –
R09 (female) (2) and chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
(24) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
(19) – chassis ground
(2) While the switch is not pressed, the light lights up.
S13 (male) Step light switch
Released
Pressed
CP01 Step light switch
Released
Between
Pressed
CP02 Step light switch
Released
Between
Pressed
40 Troubleshooting
Resistance
Min. 1 Mz
Max. 1 z
R09
Voltage Max. 1 V
Voltage Max. 1 V
Voltage
Max. 1 V
20 – 30 V
Voltage
Max. 1 V
20 – 30 V
(60 seconds)
PC800, 850-8