Failure Code [Dwj0Ka] Merge-Divider Sol Open Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DWJ0KA] Merge-divider Sol Open Circuit

Action level Failure code
L01 DWJ0KA
Controller output voltage to solenoid is above standard value when pump controller does
Detail of
not drive pump merge-divider solenoid, so pump controller determines that open circuit
failure
exists in pump merge-divider 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
Problem on
Machine does not turn during travel.
machine
Controller's command (ON/OFF) to pump merge-divider 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 open
Related
circuit.)
information
(Code: 02300)
pump merge-divider circuit is made when solenoid is de-energized.
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective pump merge-
divider 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
Pump Merge-divider Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V04, and connect T-adapter to male side.
Resistance Between V04 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector V04 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 V04 (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) (85) 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 V04, and connect T-adapter to each
female side.
Between CP02 (female) (85) and V04 (female) (1)
Resistance Between V04 (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-DWJ0KA-400-A-Z0-A)
20 to 60 z
1 to 4.5 V
20 to 60 z
Max. 1 z
Max. 1 z
40-347