Failure Code [Dy20Ma] Wiper Motor Defective Function - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [DY20MA] Wiper Motor Defective Function

Action level Failure code
DY20MA
When windshield wiper rests, P signal that indicates that wiper motor is at rest area position
Detail of
is not input.
failure
Stops output for resting to wiper motor.
Action of
If cause of failure disappears, machine becomes normal by itself.
controller
Problem on
Wiper does not rest.
machine
Condition of P contact signal of wiper resting area can be checked by using monitoring
function.
(Code: 02204)
Related
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
information
be measured at pump controller connector.
Method of reproducing failure code: Turn starting switch to ON position and set wiper switch
to INT/ONoOFF position.
No. Cause
Defective wiper
motor
1
(Internal open circuit)
Open or short circuit
2
in wiring harness
Open circuit in wiring
harness
3
(Wire breakage or
defective contact of
connector)
Pump controller is
4
defective.
40-370
Wiper Motor Defective Function
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) (4) and (5)
Resis-
tance
Between M05 (female) (1) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and CP02, and connect T-adapter to each
female side.
Between CP01 (female) (75) and
ground
Resis-
tance
Between CP02 (female) (114) and
(119)
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 CP01, CP02, and M05.
3. Connect T-adapters to female side of connectors CP01 and CP02 and male
side of M05.
Between CP01 (female) (75) and M05 (male) (4)
Between M05 (male) (5) and ground (T01)
Resis-
tance
Between CP02 (female) (114) and M05 (male) (1)
Between CP02 (female) (119) and M05 (male) (3)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
(PC88MR-DY20MA-400-A-Z0-A)
Wiper position: Rest
area
Wiper position:
Min. 1 Mz
Working area
Wiper position: Whole
Max. 20 z
range
Wiper position: Rest
area
Wiper position:
Min. 1 Mz
Working area
Wiper position: Whole
Max. 20 z
range
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
PC88MR-10