Komatsu PC200-8M0, Shop Manual

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304 Troubleshooting by failure code, Part 4
Failure code [DHSAMA] Swing RH PPC Press Sensor Abnormality
40-304
12
PC200, 200LC, 220, 220LC-8M0
SEN06136-00
Failure code [DHSAMA] Swing RH PPC Press Sensor Abnormality
Action
level
Failure code
Failure
Swing Right PPC Pressure Sensor Abnormality
(Pump controller system)
L01 DHSAMA
Detail of failure q Signal voltage of swing RIGHT PPC pressure sensor is below 0.3 V or above 4.5 V.
Action of con-
troller
q
Controls machine taking it that swing RIGHT PPC pressure is 0 MPa {0 kg/cm
2
}.
q
If cause of failure disappears, machine becomes normal by itself.
Problem on
machine
q
Automatic deceleration does not cancel.
q
Controllability of swing RIGHT deteriorates.
Related infor-
mation
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-
sured at pump controller connector.
q
Swing RIGHT PPC pressure can be checked with monitoring function.
(Code 09002: Swing RIGHT PPC pressure)
q
Method of reproducing failure code: Turn starting switch to ON position or start engine.
Cause Procedure, measuring location, criteria and remarks
1
Defective 5V sensor power supply
1 system
If failure code [ DA25KP ] is also displayed, perform troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector P07, 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 P07 (female) (3) and (1)
Power sup-
ply
Voltage 4.5 to 5.5 V
2
Defective swing RIGHT PPC pres-
sure sensor (internal defect)
1. Turn starting switch to OFF position.
2. Connect T-adapters to connector P07.
3. Turn starting switch to ON position.
Between P07 (2) and (1)
Sensor out-
put
Voltage 0.5 to 4.5 V
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 P07 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, swing RIGHT PPC pressure
sensor is defective.
a
After finishing test, restore connectors.
3
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P07, 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 P07 (female) (1)
Resistance Max. 1
z
Between C01 (female) (72) and P07 (female) (2) Resistance Max. 1
z
a
If power supply voltage measured in check on
cause 1 is normal, this check is not required.
Between C01 (female) (9) and P07 (female) (3)
Resistance Max. 1
z
4
Ground fault in wiring harness
(contact with ground circuit)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P07, and connect T-adapters to either
female side.
Between ground and C01 (female) (72) or P07
(female) (2)
Resistance Min. 1 M
z