SANY LATIN AMERICA
7-39
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
User Code
Service Code
Trouble
Reading of rear pump output pressure is abnormal.
Only output alarm is enabled. .
21
E321
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
—
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-116M 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-116M C and pin 53 of controller
Resistance
≤
1
Ω
Between CN-116M 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-116M C and ground
Resistance
≥
2M
Ω
4
Failure of sen-
sor
●
Turn engine start switch to OFF position. Then, keep it at OFF position to
perform troubleshooting.
Between CN-116M C and ground
Voltage
0.5±0.2V
5
5V
53
54
56
C
B
A
CN-447M
502#
00#
50#
ZX215-1005075
SIGNAL
GND WIRE
CONTROLLER
5V
PWR SUPPLY
GND WIRE
CAB
CHASSIS HARNESS
REAR PUMP
PRESS. SENSOR
REAR PUMP PRESSURE
SIGNAL COLLECT PORT
E321 (abnormality in rear pump output pressure)
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