Failure Code [Dy2Dkb] Wiper Motor (Normal) Short Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [DY2DKB] Wiper Motor (Normal) Short Circuit

Z0-A)
Action level Failure code
DY2DKB
Detail of When power to normal rotation side of wiper motor drive is supplied, short circuit was
failure detected because of abnormal current flown to the circuit.
Stops driving wiper motor drive normal rotation side.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
Problem on
Windshield wiper does not operate.
machine
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
be measured at pump controller connector.
Related
Method of reproducing failure code: Turn starting switch to ON position and set wiper
information
switch to INT or ON position.
No. Cause
Defective wiper motor
1
(Internal short circuit or
ground fault)
Short circuit in wiring
2
harness
Ground fault in wiring
harness
3
(Contact with ground
circuit)
Pump controller is
4
defective.
40-374
Wiper Motor (Normal) Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector M05 and connect T-adapter to female side.
Between M05 (female) (3) and (1)
Resistance
Between M05 (female) (3) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02 and M05 and connect T-adapter to either
harness side.
Between CP02 (female) (119) and (114), or
Resistance
between M05 (male) (1) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02 and M05 and connect T-adapter to either
harness side.
Between CP02 (female) (119) and ground, or
Resistance
between M05 (male) (3) and ground
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector M05.
3. Turn starting switch to ON position.
4. Turn wiper switch ON and OFF, and troubleshoot.
Voltage Between M05 (3) and (5)
(PC88MR-DY2DKB-400-A-
Wiper
Max. 3 V
switch: OFF
Wiper Pulse below 3 V io
switch: ON above 20 V
Max. 20 z
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
PC88MR-10