Komatsu Galeo PC850-8 User Manual

16 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DHPFKA] R Pump P. Sensor Disc.
Action code Failure code
Trouble
R Pump P. Sensor Disc.
(Pump controller system)
E02 DHPFKA
Contents of
trouble
• Signal voltage of R pump pressure sensor circuit is below 0.5 V or above 4.5 V.
Action of
controller
• Fixes travel speed to Lo.
• Continues controls, assuming pressure to be constant {350 kg/cm
2
}.
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• Front pump pressure cannot be monitored.
• Travel speed and work equipment speed do not rise.
Related
information
• R pump pressure can be checked with monitoring function. (Code: 01113 R pump pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defective 5V sensor power
If failure code [DA25KP] is also displayed, carry out troubleshooting for
it first.
2
Defective R pump pressure
sensor (Internal trouble)
aPrepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting in each case.
P26 Voltage
Between (3) – (1) Power supply 4.5 – 5.5 V
Between (2) – (1) Signal 0.5 – 4.5 V
Voltage is measured with wiring harness connected. Accordingly, if volt-
age is abnormal, check wiring harness and controller, too, for another
cause of trouble, and then judge.
3
Disconnection in wiring har-
ness (Disconnection in wir-
ing or defective contact in
connector)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP01 (female) (10) –
J08 – P26 (female) (1)
Resistance Max. 1 z
Wiring harness between CP01 (female) (2) –
P26 (female) (2)
Resistance Max. 1 z
Wiring harness between CP01 (female) (22) –
J24 – P26 (female) (3)
Resistance Max. 1 z
4 Defective pump controller
If causes 1 – 3 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)

Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English