28 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DW43KB] Travel Speed Sol. S/C
Action code Failure code
Trouble
Travel Speed Sol. S/C
(Pump controller system)
— DW43KB
Contents of
trouble
• Abnormal current flowed at output to travel speed solenoid circuit.
Action of
controller
• Turns output to travel speed solenoid circuit OFF.
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• Travel speed is not set to Hi (Swash plate angle of travel motor is not minimized).
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Related
information
• The travel speed shifting solenoid is not turned ON when the engine speed is below 1,200 rpm.
• Operation of the travel speed solenoid (ON or OFF) can be checked in the monitoring function.
(Code No. 02300: Solenoid 1)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Travel Speed Sol. Disc.
(Internal short circuit or
ground fault)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
V04 (male) Resistance
Between (2) – (1) 20 – 60 z
Between (2) – chassis ground Min. 1 Mz
2
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP03 (female) (27) –
V04 (female) (2) and chassis ground
Resistance Min. 1 Mz
3 Defective pump controller
aPrepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
CP03 Travel speed Voltage
Between (27) –
chassis ground
Lo Max. 1 V
Hi 20 – 30 V
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