Failure Code [Dy2Ckb] Washer Motor Short Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [DY2CKB] Washer Motor Short Circuit

Action level Failure code
DY2CKB
Detail of When outputting current to window washer motor, abnormal current flows and short circuit
failure is detected.
Stops driving washer motor.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
Problem on
Window washer does not operate.
machine
Method of reproducing failure code: Turn starting switch to ON position and turn washer
Related
switch to ON position.
information
No. Cause
Defective fuse No. 4 in
1
fuse box F01
Defective washer motor
2 (Internal open circuit or
ground fault)
Defective assembled-
type diode D02
3
(Internal short circuit)
Open or short circuit in
4
wiring harness
Ground fault in wiring
harness
5
(Contact with ground
circuit)
Hot short circuit in
6
wiring harness
Pump controller is
7
defective.
40-372
Washer Drive Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
If the fuse is blown out, the circuit probably has a ground fault, etc.
1. Turn starting switch to OFF position.
2. Disconnect connector M06 .
Between M06 (male) (1) and (2)
Resistance
Between M06 (male) (1) and ground, or between
M06 (male) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector D02 and connect T-adapter to male side.
a Measure it with diode range of multimeter.
Between D02 (male) (6) (+) and (2) (-)
Continuity
Between D02 (male) (2) (+) and (6) (-)
1. Turn starting switch to OFF position.
2. Disconnect connector CP01 and connect T-adapter to female side.
3. Turn starting switch to ON position.
a Ignore failure codes displayed on machine monitor.
Voltage Between CP01 (female) (3) and ground
a If no failure is found in checks on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect fuse No. 4 of fuse box F01.
3. Disconnect connectors CP01, and D02, and connect T-adapter to any one
of female sides.
Between F01-4 or D02 (female) (2) and ground
Resistance Between ground and any one of CP01 (female) (3)
or D02 (female) (6)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and M06, and connect T-adapter to female
side of CP01.
3. Disconnect fuse No. 4 of fuse box F01.
4. Turn starting switch to ON position.
a Ignore failure codes displayed on machine monitor.
Voltage Between D02 (female) (6) and ground
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
(PC88MR-DY2CKB-400-A-Z0-A)
Approx. 10
z
Min. 1 Mz
Continuity
No
continuity
20 to 30 V
Min. 1 Mz
Min. 1 Mz
Max. 4.5 V
PC88MR-10