Troubleshooting by failure code
Failure code [D1EQKZ] (Ladder operation alarm relay output abnormality: Open circuit, ground fault)
WA900-3E0
Failure code [D1EQKZ] (Ladder operation alarm relay output abnor-
mality: Open circuit, ground fault)
40-17
Action level Failure code
Failure Open circuit or ground fault in ladder alarm relay
E01 D1EQKZ
Detail of failure
q Controller detects open circuit or ground fault while it is not driving ladder alarm relay.
Action of con-
troller
q (None in particular)
Problem on
machine
q If circuit is open, ladder alarm does not sound while ladder is being operated.
q If circuit has ground fault, ladder alarm does not stop sounding.
Related infor-
mation
q Output signal to ladder alarm relay can be checked with monitoring function.
Code: 40990 "D-OUT-2" (ON: 1, OFF: 0)
No. Cause Procedure, measuring location, criteria and remarks
1
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PL14.
Resistance
Between PC0 (female) (7) and PL14 (female) (2) Max. 1 z
Between PC0 (female) (2) and PLCU (female) (1) Max. 1 z
2
Ground fault in wiring harness
(short to ground circuit)
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PL14.
Resistance
Between PC0 (female) (7) and (40) Min. 1 Mz
Between PC0 (female) (7) and ground Min. 1 Mz
3 Defective ladder alarm relay
1. Turn starting switch to OFF position.
2. Disconnect PL13.
Resistance
Between PL14 (male) (1) and (2) 200 to 400 z
Between ground and each of PL14 (male) (1) and
(2)
Min. 1 Mz
4
Defective power ladder controller
(when measured voltage is nor-
mal)
1. Turn starting switch to OFF position.
2. Disconnect PC0 and connect T-adapters.
3. Start engine and perform troubleshooting.
Voltage
Between PC0 (female) (7) and
(female) (31)
Min. 18 V
40-17
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