Failure Code [Dhpbma] R Pump Press Sensor Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06135-00

Failure code [DHPBMA] R Pump Press Sensor Abnormality

Action
Failure code
level
L01 DHPAMA
q
Detail of failure Signal voltage of rear pump pressure sensor circuit is below 0.3 V or above 4.5 V.
Action of con-
q
Controls machine taking it that rear pump pressure is 0 MPa {0 kg/cm
troller
q
If cause of failure disappears, machine becomes normal by itself.
q
Problem on Automatic travel speed selector function does not work.
q
machine Straight travel performance or steering performance lowers.
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
Rear pump pressure can be checked with monitoring function.
(Code: 01101 R pump 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 rear pump pressure sen-
2
sor (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)
46
40-303
Failure code [DHPBMA] R Pump Press Sensor Abnormality
Rear Pump 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 P26, 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 P26 (female) (3) and (1)
1. Turn starting switch to OFF position.
2. Connect T-adapters to connector P26.
3. Turn starting switch to ON position.
Between P26 (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 P26 with connector P25 of front pump 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, rear pump pressure sensor
is defective.
a After finishing test, restore connectors.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P26, 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 P26 (female) (1)
Between C01 (female) (68) and P26 (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 P26 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P26, and connect T-adapters to either
female side.
Between C01 (female) (68) or P26 (female) (2) and
ground
303 Troubleshooting by failure code, Part 3
2
}.
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