Komatsu Galeo PC850-8 User Manual

56 PC800, 850-8
SEN00791-02 40 Troubleshooting
Failure code [D195KB] Step Light Relay S/C
Action code Failure code
Trouble
Step Light Relay S/C
(Pump controller system)
— D195KB
Contents of
trouble
• Abnormal current flowed in the step light relay circuit (the primary circuit of the relay), when power is
supplied to the circuit.
Action of
controller
• Power to the step light relay circuit is switched OFF.
• Even after the failure cause disappears of itself, the machine operation does not return to normalcy,
unless the engine starting switch is once turned OFF.
Problem that
appears on
machine
• Step light does not light up.
Related
information
• Operation of the step light relay circuit (the primary side of the relay) (ON or OFF) can be checked in
the monitoring function. (Code No. 03701: Controller output 2)
• This error code detects abnormality on the primary (coil) side of the step light relay and cannot detect
abnormality on the secondary (contact) side.
Possible causes
and standard
value in normal
state
Cause Standard value in normalcy and references for troubleshooting
1
Step light relay defective
(Internal short-circuiting)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
R09 (male) Resistance value
Between (1) – (2) 250 – 350 z
2
Grounding fault of wiring
harness
(Contact with grounding cir-
cuit)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between wiring harness between CP02
(female) (19) and R09 (female) (2) and ground-
ing
Resis-
tance
value
Above 1
Mz
3 Pump controller defective
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
CP02 Step light switch Voltage
Between (19) – chas-
sis ground
OFF
20 – 30 V
(Kept for 60 sec)
ON Below 1 V

Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English