Failure Code [Dhs8Ma] Boom Raise Ppc Press Sens Def Function - Komatsu PC88MR-10 Shop Manual

Failure code [DHS8MA] Boom Raise PPC Press Sens Def Function

DHS8MA-400-A-Z0-A)
Action level Failure code
L01 DHS8MA
Detail of
Signal voltage of Boom Raise PPC pressure sensor circuit is below 0.3 V or above 4.5 V.
failure
Sets Boom Raise PPC pressure to 0 MPa {0 kg/cm
Action of
If cause of failure disappears, machine becomes normal by itself.
controller
Automatic deceleration does not cancel.
Problem on
Controllability of Boom Raise deteriorates.
machine
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.
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
Related
be measured at pump controller connector.
information
Boom Raise PPC pressure can be checked with monitoring function.
(Code: 07400 Boom Raise PPC pressure)
Method of reproducing failure code: Turn starting switch to ON position or start engine.
No. Cause
Defective 5V sensor power
1
supply 1 system
Defective Boom Raise PPC
pressure sensor (internal
2
defect)
PC88MR-10
Boom Raise PPC Pressure Sensor Defective Function
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 P03 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.
Voltage Between P03 (female) (3) and (1)
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector P03.
3. Turn starting switch to ON position.
Voltage Between P03 (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 P03 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 Raise
PPC pressure sensor is defective.
a After finishing test, restore connectors.
40 Troubleshooting
Troubleshooting by failure code (Display of code)
2 }.
(PC88MR-
Power
4.5 to 5.5
supply
V
Sensor
0.5 to 4.5
output
V
40-309