Komatsu PC200-8M0, Shop Manual

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304 Troubleshooting by failure code, Part 4
Failure code [DW91KA] Travel Neutral Sol Open Circuit
40-304
44
PC200, 200LC, 220, 220LC-8M0
SEN06136-00
Failure code [DW91KA] Travel Neutral Sol Open Circuit
Action
level
Failure code
Failure
Travel Neutral Solenoid Open Circuit
(Pump controller system)
L01 DW91KA
Detail of failure
q
Controller output voltage to solenoid is above standard value when pump controller does not drive
travel junction solenoid, so pump controller determines that open circuit exists in travel junction so-
lenoid circuit.
Action of con-
troller
q
None in particular (Since no current flows, solenoid is not energized.)
q
If cause of failure disappears, machine becomes normal by itself.
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 open 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 open circuit)
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
2
Open or short circuit in wiring har-
ness
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between C02 (female) (110) and each of (115),
(117) and (120)
Resistance 20 to 60
z
3
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
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-adapters to each
female side.
Between C02 (female) (110) and V05 (female) (1) Resistance Max. 1
z
Between V05 (female) (2) and C02 (female) (115)
or (117) or (120)
Resistance Max. 1
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.)