Failure Code [Dhs8Ma] Boom Raise Ppc Press Sensor Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DHS8MA] Boom Raise PPC Press Sensor Abnormality

Action
Failure code
level
L01 DHS8MA
q
Detail of failure Signal voltage of boom RAISE PPC pressure sensor circuit is below 0.3 V or above 4.5 V.
Action of con-
q
Controls machine taking it that boom RAISE 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 boom RAISE 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
Boom RAISE PPC pressure can be checked with monitoring function.
(code: 07400 Boom RAISE PPC pressure)
q
Method of reproducing failure code: Turn starting switch to ON position or start engine.
Cause
Defective 5V sensor power
1
supply 1 system
Defective boom RAISE PPC
2 pressure sensor (internal
defect)
Open circuit in wiring har-
ness (wire breakage or
3
defective contact of connec-
tor)
Ground fault in wiring har-
4 ness (contact with ground
circuit)
Hot short circuit in wiring har-
5 ness (contact with 24 V cir-
cuit)
8
40-304
Failure code [DHS8MA] Boom Raise PPC Press Sensor Abnormality
Boom Raise 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 P06 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 P06 (female) (3) and (1)
1. Turn starting switch to OFF position.
2. Insert T-adapters in connector P06.
3. Turn starting switch to ON position.
Between P06 (2) and (1)
a If power supply voltage is normal and sensor output voltage is abnormal, it is dif-
ficult 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 P06 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, boom RAISE PPC pressure
sensor is defective.
a After finishing test, restore connectors.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P06, 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 P06 (female) (1)
Between C01 (female) (53) and P06 (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 P06 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P06, and connect T-adapters to either female
side.
Between C01 (female) (53) and ground, or between P06
(female) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector P06.
3. Connect T-adapters to female side of connector P06.
4. Turn starting switch to ON position.
Between P06 (female) (2) and ground
304 Troubleshooting by failure code, Part 4
2
}.
Power sup-
Voltage
ply
Sensor out-
Voltage
put
Resistance
Resistance
Resistance
Resistance
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
Min. 1 Mz
Max. 1 V