SANY LATIN AMERICA
7-49
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
User Code
Service Code
Trouble
Voltage setting of fuel control dial is abnormal. En-
gine returns to auto idle.
31
E231
Failure description
The voltage of fuel control dial other than 0.25 – 4.75V keeps more than
200msec when the power is on.
Response from controller The throttle is switched to idle position.
Symptom of machine
Engine returns to auto idle speed.
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-302F
①
and
③
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-302F
②
and pin 34 of controller
Resistance
≤
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-302F
②
and ground
Resistance
≥
2M
Ω
4
Short circuit
of signal wire
(contact with
power supply)
●
Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-302F
②
and ground
Voltage
≤
5V
5
Defective
knob
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Unplug the connector CN-302F, and measure the
resistance between dial
①
and
③
Resistance
5K±15%
Ω
75
55
34
1
2
1
2
3
1
2
3
3
1
2
3
CN-142M
CN-131M
CN-302F
50#
506#
0#
ZX215-1005085
FUEL CTRL
DIAL
SENSOR 5V
YELLOW
BLUE
RED
FUEL CONTROL DIAL
SET VOLTAGE
CAB
GND WIRE
E231 (abnormality in fuel control dial set voltage)
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