Komatsu PC200-8M0, Shop Manual

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304 Troubleshooting by failure code, Part 4
Failure code [DW43KA] Travel Speed Sol Open Circuit
40-304
36
PC200, 200LC, 220, 220LC-8M0
SEN06136-00
Failure code [DW43KA] Travel Speed Sol Open Circuit
Action
level
Failure code
Failure
Travel Speed Solenoid Open Circuit
(Pump controller system)
L01 DW43KA
Detail of failure
q
No current flows when pump controller drives travel speed selector solenoid, so pump controller
determines that open circuit exists in travel speed selector solenoid 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
"Hi" travel speed is slow. (Although "Hi" is diaplayed on machine monitor, actual travel speed is still
"Mi".)
Related infor-
mation
q
Controller's command (ON/OFF) to travel speed selector solenoid can be checked with monitoring
function. (As long as controller's command to solenoid is "ON", sensor status displayed on moni-
toring screen is "ON" even if solenoid is not energized due to short circuit.)
(Code: 02300 Solenoid 1)
q
Method of reproducing failure code: Start engine, set travel speed to High and operate travel lever.
Cause Procedure, measuring location, criteria and remarks
1
Defective travel speed selector
solenoid (Internal open circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector V04, and connect T-adapters to male side.
Between V04 (male) (1) and (2) Resistance 20 to 60
z
2
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between C02 (female) (87) and each of (115) ,
(117) and (120)
Resistance 20 to 60
z
a
If no failure is found by above checks , this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V04, and connect T-adapters to each
female side.
Between C02 (female) (87) and V04 (female) (1) Resistance Max. 1
z
Between V04 (female) (2) and each of C02 (female)
(115), (117) and (120)
Resistance Max. 1
z
3 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.)