Failure Code [Dhs9Ma] Boom Lower Ppc Press Sensor Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DHS9MA] Boom Lower PPC Press Sensor Abnormality

Action
Failure code
level
L01 DHS9MA
q
Detail of failure Signal voltage of boom LOWER pressure sensor circuit is below 0.3 V or above 4.5 V.
Action of con-
q
If cause of failure disappears, machine becomes normal by itself.
troller
q
Problem on Automatic deceleration does not cancel.
machine q Controllability of boom LOWER 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 lower PPC pressure can be checked with monitoring function.
(Code: 07500 Boom LOWER PPC pressure)
q
Method of reproducing failure code: Turn starting switch to ON position or start engine.
Cause
Defective 5 V sensor power sup-
1
ply 2 line
Defective boom LOWER PPC
2
pressure 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)
10
40-304
Failure code [DHS9MA] Boom Lower PPC Press Sensor Abnormality
Boom Lower 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 P02 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 P02 (female) (3) and (1)
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector P02.
3. Turn starting switch to ON position.
Between P02 (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 P02 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 again for this failure code, boom LOWER PPC
pressure sensor is defective.
a After finishing test, restore connectors.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P02, 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 P02 (female) (1)
Between C01 (female) (14) and P02 (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 P02 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P02, and connect T-adapters to either
female side.
Between ground and C01 (female) (14) and ground,
or between P02 (female) (2)
304 Troubleshooting by failure code, Part 4
Power sup-
Voltage
ply
Sensor out-
Voltage
put
Resistance
Resistance
Resistance
Resistance Min. 1 Mz
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