Failure Code [Da25Kp] 5V Sensor 1 Power Voltage Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [DA25KP] 5V Sensor 1 Power Voltage Low Error

A-Z0-A)
Action level Failure code
DA25KP
Detail of
Voltage of 5 V sensor power supply output 1 circuit is below 2.5 V or above 6.0 V.
failure
Stops output of power from 5 V sensor power supply output 1.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
Signal of pressure sensor is not input properly.
The error code for the pressure sensor is displayed as well.
Travel and work equipment speeds are slow.
Problem on
Automatic travel speed selector function does not work (pump pressure sensor system).
machine
Auto-decelerator function remains activated or fine control performance of work
equipment is poor.
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
No. Cause
Defective pressure
sensor
1
(Internal short circuit)
Hot short circuit in
2
wiring harness
Ground fault in wiring
harness
3
(contact with ground
circuit)
Pump controller is
4
defective.
PC88MR-10
5 V Sensor Power Supply Output 1 Voltage Low
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connectors of the following sensors one by one and turn
starting switch ON each time.
a If this failure code goes out, disconnected sensor is defective.
a Since connector is disconnected, other failure codes appear. Ignore all
of displayed failure codes other than this one.
3. Each time troubleshooting is finished, return to step 1.
Sensor
Boom LOWER pressure sensor
Boom RAISE pressure sensor
Arm IN pressure sensor
Arm OUT pressure sensor
Bucket CURL pressure sensor
Bucket DUMP pressure sensor
Boom swing (right) pressure sensor
Boom swing (left) pressure sensor
Swing (right) pressure sensor
Swing (left) pressure sensor
Travel pressure sensor
Pump pressure sensor
Service pressure sensor (dummy)
a To measure voltage before controller stops output of power.
1. Turn starting switch to OFF position.
2. Disconnect connectors P01 to 08, P10, P11, P25, P26 and P49.
3. Connect T-adapter to female side of connector P04.
4. Turn starting switch ON (with connector disconnected).
Voltage Between P09 (female) (3) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01, P01 to P08, P10, P11, P25, P26 and P49.
3. Connect T-adapter to female side of connector CP01.
Resistance Between CP01 (female) (6) and ground
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DA25KP-400-
Connector
P06
P03
P05
P02
P04
P01
P07
P08
P10
P11
P26
P25
P49
4.5 to 5.5 V
Min. 1 Mz
40-261