14 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DHPEKB] F Pump P. Sensor S/C
Action code Failure code
Trouble
F Pump P. Sensor S/C
(Pump controller system)
E02 DHPEKB
Contents of
trouble
• Signal voltage from the front pump pressure sensor is below 0.3 V or above 4.42 V.
Action of
controller
• Fixes travel speed to Lo.
• Continues controls, assuming pressure to be constant {350 kg/cm
2
}.
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• Front pump pressure cannot be monitored.
• Travel speed and work equipment speed do not rise.
Related
information
• Input from the front pump pressure sensor (pressure) can be checked in the monitoring function.
(Code No. 01100: Front pump pressure)
• Method of reproducing failure code: Turn starting switch ON or start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Sensor power supply sys-
tem defective
If failure code [DA25KP] is displayed, carry out troubleshooting for it
first.
2
Front pump pressure sen-
sor defective
(Internal defect)
aTurn the engine starting switch OFF for the preparations, and turn to
ON or keep the engine running during the troubleshooting.
P25 Voltage
Between (3) – (1) Power supply 4.5 – 5.5 V
Between (2) – (1) Signal 0.5 – 4.5 V
The pressure sensor voltage is measured with the wiring harness con-
nected. Accordingly, if the voltage is abnormal, check the wiring harness
and controller, too, for another cause of the trouble, and then judge.
3
Grounding fault of wiring
harness
(Contact with grounding cir-
cuit)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between wiring harness between CP01
(female) (8) – P25 (female) (2) and grounding
Resistance Min. 1 Mz
4
Short-circuiting of wiring
harness
(Contact with 24 V circuit)
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Between wiring harness between CP01
(female) (22), J24 – P25 (female) (3) and
grounding
Voltage Max. 1 V
Between wiring harness between CP01
(female) (8) – P25 (female) (2) and grounding
Voltage Max. 1 V
Between wiring harness between C01 (female)
(8) – P25 (female) (2) and grounding
Voltage Max. 1 V
5 Pump controller defective
aIf causes 1 – 4 are not detected, pump may be defective. (Since trou-
ble is in system, troubleshooting cannot be carried out.)
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