Failure Code [Dbl1Kk] (Power Low Error: Battery Direct) - Komatsu WA900-3E0 Shop Manual

Failure code [DBL1KK] (Power Low Error: Battery direct)

Action level Failure code
E03 DBL1KK
Detail of failure Power supply voltage of power ladder controller drops.
q
Action of con- Stops judging all errors other than this failure that occur in power ladder controller.
q
troller Stops driving solenoid and buzzer.
q
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
(when power supply voltage mea-
sured at pin is normal)
1
a Check which path has problem
since pin 1 and pin 2 have dif-
ferent paths.
2 Blown fuse
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

Failure code [DBL1KK] (Power Low Error: Battery direct)

Drop in power supply voltage from battery
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.
Between each of PC0 (1) and (11) and (31)
Voltage
Between each of PC0 (2) and (12) 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.
Between ground and each of PC0 (female) (1) and
(11)
Voltage
Between ground and each of PC0 (female) (2) and
(12)
1. Turn starting switch to OFF position.
2. Disconnect PC0.
Between ground and each of PC0 (female) (21) and
Resistance
(31)
1. Turn starting switch to OFF position.
2. Disconnect PC0.
Between ground and each of PC0 (female) (1) and
(1)
Resistance
Between ground and each of PC0 (female) (2) and
(12)
Troubleshooting by failure code
20 to 30 V
20 to 30 V
Continuity
20 to 30 V
20 to 30 V
Max. 1 z
Min. 1 Mz
Min. 1 Mz
40-27
4 0 - 2 7