SANY LATIN AMERICA
7-40
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
User Code
Service Code
Trouble
Arm-in pilot pressure is abnormal. Only output alarm
is enabled. .
22
E322
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
The arm in 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-128M 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 per-
form troubleshooting.
Between CN-128M C and pin 71 of controller
Resistance
≤
1
Ω
Between CN-128M 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 per-
form troubleshooting.
Between CN-128M 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-128M C and ground
Voltage
0.5±0.2V
5
5V
71
54
56
C
B
A
CN-428M
203#
00#
50#
ZX215-1005076
SIGNAL
GND WIRE
CONTROLLER
GND WIRE
5V
PWR SUPPLY
CAB
CHASSIS HARNESS
ARM-IN PILOT
PRESS. SENSOR
ARM-IN PILOT PRESSURE
SIGNAL COLLECTING PORT
E322 (abnormality in arm-in pilot pressure)
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