Failure Code [Dhshma] Travel Bw L Ppc Press Sensor Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06136-00

Failure code [DHSHMA] Travel BW L PPC Press Sensor Abnormality

Action
Failure code
level
L01 DHSHMA
q
Detail of failure Signal voltage of left travel REVERSE PPC pressure sensor is below 0.3 V or above 4.5 V.
Action of con-
q
Controls machine taking it that left travel REVERSE 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.
machine q Controllability of right travel REVERSE 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
Left travel REVERSE PPC pressure can be checked with monitoring function.
(Code: 07104 Left travel REVERSE 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 left travel REVERSE
2 PPC 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)
24
40-304
Failure code [DHSHMA] Travel BW L PPC Press Sensor Abnormality
Travel Left Backward PPC Pressure Sensor Abnormality
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
If failure code [DA26KP] is also displayed, perform troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector P10 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 P10 (female) (3) and (1)
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector P10.
3. Turn starting switch to ON position.
Between P10 (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 P10 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 in this failure code column, left travel REVERSE
PPC pressure sensor is defective.
a After finishing test, restore connectors.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P10, 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 P10 (female) (1)
Between C01 (female) (35) and P10 (female) (2)
a If power supply voltage measured in check on
cause 1 is normal, this check is not required.
Between C01 (female) (8) and P10 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P10, and connect T-adapters to either
female side.
Between ground and C01 (female) (35) or P10
(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
2
}.
4.5 to 5.5 V
0.5 to 4.5 V
Max. 1 z
Max. 1 z
Max. 1 z