Failure Code [Dy2Ekb] Wiper Drive (Rev) Short - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DY2EKB] Wiper Drive (Rev) Short

Action
Failure code
level
– DY2EKB
q
When outputting current to reverse rotation side of wiper motor drive is turned ON, abnormal cur-
Detail of failure
rent flows in circuit and short circuit is detected.
q
Shuts off power supply to reverse rotation system of wiper motor drive.
Action of con-
q
Even if cause of failure disappears, machine does not become normal until starting switch is turned
troller
to OFF position.
Problem on
q
Windshield wiper does not operate.
machine
q
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be mea-
Related infor- sured at pump controller connector.
q
mation Method of reproducing failure code: Turn starting switch to ON position and set wiper switch to INT
or ON.
Cause
Defective wiper motor
1 (internal short circuit or ground
fault)
2 Short circuit in wiring harness
Ground fault in wiring harness
3
(contact with ground circuit)
4 Defective pump controller
48
40-305
Wiper motor Drive Reverse rotation 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-adapters to female side.
Between M05 (female) (1) and (3)
Between M05 (female) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and M05 and connect T-adapter to wiring
harness side of either of them.
Between C02 (female) (119) and (114), or between
M05 (male) (1) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and M05 and connect T-adapter to wiring
harness side of either of them.
Between C02 (female) (114) or M05 (male) (1) and
ground
If no abnormality is found by above checks, pump controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector M05.
3. Turn starting switch to ON position.
4. Turn wiper switch ON and OFF, and troubleshoot.
Wiper switch:
Between M05 (1) and
(5)
Wiper switch: ON
305 Troubleshooting by failure code, Part 5
Failure code [DY2EKB] Wiper Drive (Rev) Short
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Voltage
OFF
Voltage
PC200, 200LC, 220, 220LC-8M0
Continuity
Max. 3 V
Pulse below 3 V io
above 20 V