56 PC800, 850-8
SEN00793-02 40 Troubleshooting
E-27 “Service” is not correctly displayed in monitor function
When attachment is installed
Failure
phenomenon
• “Service” is not correctly displayed in monitor
function
“Service” is not correctly displayed in the monitor func-
tion (special function) on the machine monitor.
Relative
information
• Monitoring code: 01901 (Pressure switch 2)
Possible causes
and standard
value in normal
state
Cause Standard value in normalcy and references for troubleshooting
1
Service PPC hydraulic
switch fault
(Internal disconnection or
short-circuiting)
aTurn the engine starting switch OFF for the preparations, and keep the
engine running during the troubleshooting.
P13 (male) Service pedal Resistance
Between (1) – (2)
NEUTRAL Min. 1 Mz
Operated Max. 1 z
2
Disconnection of wiring
harness
(Disconnection or defec-
tive contact with connector)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CP02 (female) (35) –
P13 (female) (2)
Resis-
tance
Max. 1 z
Wiring harness between P13 (female) (1) – J18 –
J20 – J19 – J25 – chassis ground
Resis-
tance
Max. 1 z
3
Grounding fault of wiring
harness
(Contact with grounding
(GND) circuit)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between CP02 (female) (35) –
P13 (female) (2) and chassis ground
Resis-
tance
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.
Wiring harness between CP02 (female) (35) –
P13 (female) (2) and chassis ground
Voltage Max. 1 V
5 Defective pump controller
aTurn the engine starting switch OFF for the preparations, and start the
engine during the troubleshooting.
CP02 Service pedal Voltage
Between
(35) – chassis ground
NEUTRAL 20 – 30 V
Operated Max. 1 V
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