Failure Code [Dhsdma] Bucket Dump Ppc Press Sensor Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DHSDMA] Bucket Dump PPC Press Sensor Abnormality

Action
Failure code
level
L01 DHSDMA
q
Detail of failure Signal voltage of bucket DUMP PPC pressure sensor is below 0.3 V or above 4.5 V.
Action of con-
q
Controls machine taking it that bucket DUMP PPC pressure is 0 MPa {0 kg/cm
troller
q
If cause of failure disappears, machine becomes normal by itself.
q
Problem on Automatic deceleration does not cancel.
q
machine Controllability of bucket DUMP deteriorates.
a If 5 V circuit (3) and ground circuit (1) of pressure sensor are connected inversely, pressure sensor
will be broken. Accordingly, take extreme care when checking.
q
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be mea-
Related infor-
sured at pump controller connector.
mation
q
Bucket DUMP PPC pressure can be checked with monitoring function.
(Code: 07301 Bucket DUMP PPC pressure)
q
Method of reproducing failure code: Turn starting switch to ON position or start engine.
Cause
Defective 5V sensor power supply
1
1 system
Defective bucket DUMP PPC pres-
2
sure sensor (internal defect)
Open circuit in wiring harness
3 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
4
(contact with ground circuit)
Hot short circuit in wiring harness
5
(contact with 24 V circuit)
18
40-304
Failure code [DHSDMA] Bucket Dump PPC Press Sensor Abnormality
Bucket Dump PPC Pressure Sensor Abnormality
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
If failure code [DA25KP] is also displayed, perform troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector P05 and connect T-adapters to female side.
3. Turn starting switch to ON position.
a If power supply voltage is abnormal, proceed to check on cause 3.
Between P05 (3) and (1)
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector P05.
3. Turn starting switch to ON position.
Between P05 (2) and (1)
a If power supply voltage is normal and sensor output voltage is abnormal, it
is difficult to judge whether cause of failure is defective sensor, ground fault
or hot short circuit in wiring harness. Check as below.
1. Turn starting switch to OFF position.
2. Replace connector P05 with connector of other PPC pressure sensor.
3. Turn starting switch to ON position and display "Abnormality Record"
screen of electrical system on machine monitor.
4. If E mark is not displayed for this failure code, bucket DUMP PPC pressure
sensor is defective.
a After finishing test, restore connectors.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P05, and connect T-adapters to each
female side.
a If power supply voltage measured in check on
cause 1 is normal, this check is not required.
Between C01 (female) (18) and P05 (female) (1)
Between C01 (female) (34) and P05 (female) (2)
a If power supply voltage measured in check on
cause 1 is normal, this check is not required.
Between C01 (female) (9) and P05 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P05, and connect T-adapters to either
female side.
Between ground and C01 (female) (34) or P05
(female) (2)
1. Turn starting switch to OFF position.
2. Disconnect connector P05.
3. Connect T-adapters to female side of connector P05.
4. Turn starting switch to ON position.
Between P05 (female) (2) and ground
304 Troubleshooting by failure code, Part 4
2
}.
Power sup-
Voltage
ply
Sensor out-
Voltage
put
Resistance
Resistance
Resistance
Resistance Min. 1 Mz
Voltage
PC200, 200LC, 220, 220LC-8M0
4.5 to 5.5 V
0.5 to 4.5 V
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 V