Failure Code [D1Epka] (Disconnection Of Ladder Drive Pump Relay) - Komatsu WA900-3E0 Shop Manual

Failure code [D1EPKA] (Disconnection of ladder drive pump relay)

Action level Failure code
E01 D1EPKA
Detail of failure Controller detects open circuit while driving ladder pump drive relay.
q
Action of con-
(None in particular)
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
Open circuit in wiring harness
1 (wire breakage or defective con-
tact of connector)
2 Defective pump drive relay
3 Defective power ladder controller
WA900-3E0

Failure code [D1EPKA] (Disconnection of ladder drive pump relay)

Failure Open circuit 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 PL13 (female) (1)
Resistance
Between PC0 (female) (40) and PLCU (female) (2)
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.)
Troubleshooting by failure code
Max. 1 z
Max. 1 z
200 to 400 z
Min. 1 Mz
40-13
4 0 - 1 3