Komatsu PC200-8M0, Shop Manual

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304 Troubleshooting by failure code, Part 4
Failure code [DW91KB] Travel Neutral Sol Short Circuit
40-304
46
PC200, 200LC, 220, 220LC-8M0
SEN06136-00
Failure code [DW91KB] Travel Neutral Sol Short Circuit
Action
level
Failure code
Failure
Travel Neutral Solenoid Short Circuit
(Pump controller system)
L01 DW91KB
Detail of failure
q
Abnormal current flows when pump controller drives travel junction solenoid, so pump controller de-
termines that short circuit exists in travel junction solenoid circuit.
Action of con-
troller
q
Stops driving travel junction solenoid.
q Even if cause of failure disappears, machine does not become normal until starting switch is turned
to OFF position.
Problem on
machine
q
Machine does not turn during travel.
Related infor-
mation
q
Controller's command (ON/OFF) to travel junction valve solenoid can be checked with monitoring
function. (If controller sends solenoid ON command, monitoring display is ON even if solenoid is not
switched ON due to short circuit.) (Code: 02300 Solenoid 1)
q
Method of reproducing failure code: Start engine and turn machine with right and left travel levers.
Cause Procedure, measuring location, criteria and remarks
1
Defective travel junction
solenoid
(internal short circuit or
ground fault)
1. Turn starting switch to OFF position.
2. Disconnect connector V05, and connect T-adapters to male side.
Between V05 (male) (1) and (2) Resistance 20 to 60
z
Between V05 (male) (1) and ground Resistance Min. 1 M
z
2
Short circuit or ground fault
in wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between V05 (female) (110) and each of (115), (117)
and (120)
Resistance 20 to 60
z
Between C02 (female) (110) and ground Resistance Min. 1 M
z
3
Ground fault in wiring har-
ness
(contact with ground circuit)
a
If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V05, and connect T-adapter to female side of
either of them.
Between C02 (female) (110) or V05 (female) (1) and
ground
Resistance Min. 1 M
z
4 Defective pump controller
If no failure is found by above checks, pump controller is defective. (Since this is an
internal defect, troubleshooting cannot be performed.)