Failure Code [Dwk2Ka] Variable Back Press Sol Open Circuit - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DWK2KA] Variable Back Press Sol Open Circuit

Action
Failure code
level
L01 DWK2KA
q
No current flows when pump controller drives variable back pressure solenoid, so pump controller
Detail of failure
determines that open circuit exists in variable back pressure solenoid circuit.
q
Action of con- None in particular (Since no current flows, solenoid is not energized.)
q
troller If cause of failure disappears, machine becomes normal by itself.
Problem on
q
Set pressure of back pressure value cannot be changed.
machine
q
Controller's command (ON/OFF) to variable back pressure solenoid can be checked with monitor-
ing function. (If controller sends solenoid ON command, monitoring display is ON even if solenoid
Related infor-
is not switched ON due to open circuit.) (Code: 02301 Solenoid 2)
mation
q
The set pressure of back pressure value becomes low by solenoid ON.
q
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective variable back pressure
1 solenoid valve
(Internal open circuit)
Open circuit or ground fault in wir-
2
ing harness
Open circuit in wiring harness
3 (wire breakage or defective con-
tact of connector)
4 Defective pump controller
12
40-305
Failure code [DWK2KA] Variable Back Press Sol Open Circuit
Variable Back Pressure Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V25, and connect T-adapter to male side.
Between V25 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between C02(female) (85) and each of
C02(female) (115), (117), (120)
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 V25, and connect T-adapters to each
female side.
Between C02(female) (85) and V25(female)
(1)
Between each of C02(female) (115), (117),
(120) and V25(female)(2)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
305 Troubleshooting by failure code, Part 5
Resistance
Resistance
Resistance
Resistance
PC200, 200LC, 220, 220LC-8M0
20 to 60 z
20 to 60 z
Max. 1 z
Max. 1 z