Failure Code [D1Erkb] (Ladder Raise Solenoid Output Ground Fault) - Komatsu WA900-3E0 Shop Manual

Troubleshooting by failure code

Failure code [D1ERKB] (Ladder raise solenoid output ground fault)

Failure code [D1ERKB] (Ladder raise solenoid output ground fault)

Action level Failure code
E01 D1ERKB
Detail of failure Overcurrent flows when driving ladder RAISE solenoid, so solenoid is not energized.
q
Action of con- Stops ladder raise solenoid output.
q
troller Stops driving ladder RAISE solenoid until its power supply is turned off.
q
Problem on
Ladder cannot be raised.
q
machine
Ladder can be moved to storage and boarding positions by using emergency release valve.
q
Related infor-
Output signal to ladder RAISE solenoid can be checked with monitoring function.
q
mation
Code: 40992 "D-OUT-18" (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 RAISE solenoid
4 Defective power ladder controller
40-18
Failure Ground fault in ladder RAISE solenoid
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PLUP.
Between PC0 (female) (10) and PLUP (female) (1)
Resistance
Between PC0 (female) (40) and PLUP (female) (2)
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PLUP.
Between PC0 (female) (10) and (40)
Resistance
Between PC0 (female) (10) and ground
1. Turn starting switch to OFF position.
2. Disconnect PLUP.
Between PLUP (male) (1) and (2)
Resistance
Between PLUP (male) (1) and ground
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.)
4 0 - 1 8
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz
15 to 30 z
Min. 1 Mz
WA900-3E0