Failure Code [D1Epkb] (Ground Fault Of Ladder Drive Pump Relay) - Komatsu WA900-3E0 Shop Manual

Troubleshooting by failure code

Failure code [D1EPKB] (Ground fault of ladder drive pump relay)

Failure code [D1EPKB] (Ground fault of ladder drive pump relay)

Action level Failure code
E01 D1EPKB
Detail of failure Controller detects short while driving ladder pump drive relay.
q
Action of con-
Stops driving ladder pump drive relay.
q
troller
Problem on
When switch is operated, ladder does not move (power ladder pump does not operate).
q
machine
Ladder can be moved to storage and boarding positions by using emergency release valve.
q
Related infor-
Output signal to ladder pump drive relay can be checked with monitoring function.
q
mation
Code: 40990 "D-OUT-1" (ON: 1, OFF: 0)
No. Cause
Ground fault in wiring harness
1
(short to ground circuit)
2 Defective pump drive relay
3 Defective power ladder controller
40-14
Failure Ground fault in ladder pump drive relay
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PL13.
Between PC0 (female) (19) and (40)
Resistance
Between PC0 (female) (19) and ground
1. Turn starting switch to OFF position.
2. Disconnect PL13.
Between PL13 (male) (1) and (2)
Resistance
Between ground and each of PL13 (male) (1) and
(2)
If no failure is found by check on causes 1 and 2, power ladder controller may
be defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
4 0 - 1 4
Min. 1 Mz
Min. 1 Mz
200 to 400 z
Min. 1 Mz
WA900-3E0