Failure Code [Dbl2Kk] (Solenoid Power Low Error) - Komatsu WA900-3E0 Shop Manual

Failure code [DBL2KK] (Solenoid Power Low Error)

Action level Failure code
E03 DBL2KK
Solenoid supply voltage drops below 18 V while starting switch is at ON position or ladder is oper-
q
Detail of failure
ated.
Action of con-
Stops driving solenoid and buzzer.
q
troller
Ladder does not move when switch is operated.
q
Problem on
Parking brake can be released (parking brake interlock does not function) even if ladder is not
q
machine
stored in position.
Related infor-
Ladder can be moved to storage and boarding positions by using emergency release valve.
q
mation
No. Cause
Defective power ladder controller
1 (when power supply voltage mea-
sured at pin is normal)
2 Check of fuse for breakage
3 Defective circuit breaker
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
Open circuit in wiring harness
5
(short to ground circuit)
WA900-3E0
Drop in solenoid power supply voltage
Failure
(Power ladder controller system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect PC0 and connect T-adapter.
3. Start engine and perform troubleshooting.
Voltage Between PC0 (30) and (31)
Continuity PFSE in fuse box
Directly check circuit breaker CB2 of controller power supply. (If circuit breaker
is tripped, circuit probably has ground fault.)
1. Turn starting switch to OFF position.
2. Disconnect PC0.
3. Turn starting switch to ON position and perform troubleshooting.
Voltage Between PC0 (female) (30) and ground
1. Turn starting switch to OFF position.
2. Disconnect PC0.
Between ground and each of PC0 (female) (21) and
(31)
Resistance
Between PC0 (female) (30) and each of (2) and (12)
1. Turn starting switch to OFF position.
2. Disconnect PC0.
Between PC0 (female) (30) and
Resistance
ground
Troubleshooting by failure code

Failure code [DBL2KK] (Solenoid Power Low Error)

4 0 - 2 9
20 to 30 V
Continuity
20 to 30 V
Max. 1 z
Max. 1 z
Min. 1 Mz
40-29