Failure Code [Dum9Kz] (Ladder Indicator Output Abnormality: Open Circuit, Hot Short Circuit)40 - Komatsu WA900-3E0 Shop Manual

Failure code [DUM9KZ] (Ladder indicator output abnormality: Open
circuit, hot short circuit)
Action level Failure code
E01 DUM9KZ
Detail of failure Controller detects open circuit or ground fault while driving ladder indicator.
q
Action of con-
(None in particular)
q
troller
Problem on If circuit is open, ladder indicator does not light up.
q
machine If circuit has ground fault, ladder indicator remains lit and does not go out.
q
Ladder can be moved to storage and boarding positions by using emergency release valve.
q
Related infor-
Output signal to ladder indicator can be checked with monitoring function.
q
mation
Code: 40991 "D-OUT-15" (ON: 1, OFF: 0)
No. Cause
Open circuit in wiring harness
1 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
2
(short to ground circuit)
3 Defective ladder indicator
Defective power ladder controller
4 (when measured voltage is nor-
mal)
WA900-3E0
Failure code [DUM9KZ] (Ladder indicator output abnormality: Open circuit, hot short circuit)
Failure Open circuit or ground fault in ladder indicator
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect PC0, PIN1, and PIN2.
Between PC0 (female) (17) and PIN2
Resistance
Between PC0 (female) (2) and PIN1
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PIN2
Between PC0 (female) (17) and (40)
Resistance
Between PC0 (female) (17) and ground
1. Turn starting switch to OFF position.
2. Disconnect PIN1 and PIN2.
a Measure with multimeter in diode range.
Between PIN1 (male) (+) and PIN2 (female) (-)
Continuity
Between PIN2 (female) (+) and PIN1 (male) (-)
1. Turn starting switch to OFF position.
2. Disconnect PC0 and connect T-adapter.
3. Start engine and perform troubleshooting.
a Store ladder in position in order not to allow ladder indicator to light up.
Voltage Between PC0 (female) (17) and (female) (31)
Troubleshooting by failure code
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz
Continuity
No continu-
ity
Min. 18 V
40-47
4 0 - 4 7