SANY LATIN AMERICA
7-84
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-17 Incorrect arm-in pilot pressure reading
Trouble
Reading of arm-in pilot pressure is incorrect.
Related information
Possible causes and standard value in normal state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Failure of 5V
power supply
●
Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-128M
①
and
③
Voltage
Approx. 5V
2
Open circuit of
signal wire
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-128M
②
and controller pin 71
Resistance
≤
Ω
3
Short circuit of
signal wire
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-128M
②
and ground
Resistance
≥
2M
Ω
4
Failure of sen-
sor
●
Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-128M
②
and ground
Voltage
0.5V~ 4.5V
5
CN-128M
(
DF-3
)
2
3
1
75
55
71
ZX215-1005108
CHASSIS HARNESS
CAB
ARM IN
PRESS SENSOR
SIGNAL
5V
GND WIRE
CONTROLLER
SENSOR 5V
SENSOR GND WIRE
ARM IN
PRESS SENSOR
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