Failure Code [D1Epky] (Short Circuit Of Ladder Drive Pump Relay) - Komatsu WA900-3E0 Shop Manual

Failure code [D1EPKY] (Short circuit of ladder drive pump relay)

Action level Failure code
E01 D1EPKY
Detail of failure Controller detects hot short circuit while driving ladder pump drive relay.
q
Action of con-
(None in particular)
q
troller
Problem on
Power ladder pump continues to operate.
q
machine
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
Short circuit in wiring harness
1
(short to another circuit)
Hot short circuit in wiring harness
2
(short to 24 V power supply circuit)
3 Defective pump drive relay
4 Defective power ladder controller
WA900-3E0

Failure code [D1EPKY] (Short circuit of ladder drive pump relay)

Failure Hot short 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 (40)
Resistance
Between PC0 (female) (19) and ground
1. Turn starting switch to OFF position.
2. Disconnect PC0 and connect T-adapters.
3. Start engine and perform troubleshooting.
Voltage Between PC0 (female) (19) and (40)
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), (2)
and (3)
If no failure is found by check on causes 1 to 3, power ladder controller may be
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
Troubleshooting by failure code
Min. 1 Mz
Min. 1 Mz
Max. 1 V
200 to 400 z
Min. 1 Mz
40-15
4 0 - 1 5