SANY LATIN AMERICA
7-43
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
User Code
Service Code
Trouble
Reading of boom-lower pilot pressure is abnormal.
Only output alarm is enabled. .
25
E325
Failure description
A pressure feedback voltage other than 0.25 – 4.75V keeps more than
200msec when the power is on.
Response from controller Only output alarm is enabled.
Symptom of machine
Boom-lower motion is slow.
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-125M A and B
Voltage
About 5V
2
Open circuit
of signal wire
●
Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-125M C and pin 51 of controller
Resistance
≤
1
Ω
Between CN-125M B and ground
≤
1
Ω
3
Short circuit
of signal wire
(grounded)
●
Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-125M C and ground
Resistance
≥
2M
Ω
4
Failure of
sensor
●
Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-125M C and ground
Voltage
0.5±0.2V
5
51
54
56
C
B
A
CN-125M
207#
00#
50#
ZX215-1005079
5 V
SIGNAL
CONTROLLER
GND WIRE
5V
PWR SUPPLY
GND WIRE
CAB
CHASSIS HARNESS
BOOM-LOWER PILOT
PRESSURE SENSOR
BOOM-LOWER PILOT PRESS
SIGNAL COLLECTING PORT
E325 (abnormality in boom-lower pilot pressure)
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