Failure Code [Dw43Ka] Travel Speed Solenoid Open Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DW43KA] Travel Speed Solenoid Open Circuit

Z0-A)
Action level Failure code
L01 DW43KA
Controller output voltage to solenoid is above standard value when pump controller does
Detail of
not drive travel speed selector solenoid, so pump controller determines that open circuit
failure
exists in travel speed selector solenoid circuit.
None in particular (Since no current flows, solenoid is not energized.)
Action of
If cause of failure disappears, machine becomes normal by itself.
controller
"Hi" travel speed is slow. (Although "Hi" is displayed on machine monitor, actual travel
Problem on
speed is still "Lo".)
machine
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 monitoring screen is "ON" even if solenoid is not energized due to short
Related
circuit.)
information
(Code: 02300)
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective travel speed
selector solenoid
1
(Internal open circuit)
Open circuit, short
circuit, ground fault, hot
short circuit of wiring
2
harness, or defective
pump controller
Open or short circuit in
3
wiring harness
Open circuit in wiring
harness
4
(Wire breakage or
defective contact of
connector)
Pump controller is
5
defective.
PC88MR-10
Travel Speed Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V02, and connect T-adapter to male side.
Resistance Between V02 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector V02 and connect T-adapter to female side.
3. Turn starting switch to ON position.
a Shake the wiring harness by hand while measuring the voltage. If the
voltage drops to approximately 0 V during shaking, circuit is open around
this point.
Voltage Between V02 (female) (1) and (2)
a If no failure is found by check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connector CP02 and connect T-adapter to female side.
Between CP02 (female) (93) and each of (115),
Resistance
(117), and (120)
a If no failure is found by check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02 and V02, and connect T-adapters to each
female side.
Between CP02 (female) (93) and V02 (female) (1)
Resistance Between V02 (female) (2) and each of CP02
(female) (115), (117), and (120)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DW43KA-400-A-
20 to 60 z
1 to 4.5 V
20 to 60 z
Max. 1 z
Max. 1 z
40-333