SANY LATIN AMERICA
7-55
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
User Code
Service Code
Trouble
Rear pump proportional solenoid coil current is abnor-
mal. The system operates slowly.
51
E451
Failure description
Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
0.1 A lasts for 1 second. Differential current occurs in drive protection loop.
Response from controller Stop the solenoid coil when failure is detected. Power supply must be restored.
Symptom of machine
System operates slowly.
Possible causes and standard value in normal state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Open circuit of
wire harness
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-114F
①
and pin 89 of controller
Resistance
≤
1
Ω
Between CN-114F
②
and ground
≤
1
Ω
2
Short circuit of
wire harness
(grounded)
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-114F
①
and wire 0#
Resistance
≥
1M
Ω
3
Failure of pro-
portional valve
coil
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Unplug the connector CN-114F, and measure the
resistance between solenoid valve's
①
and
②
Resistance
17.5
Ω
4
Failure of con-
troller
No troubleshooting can be done for failure occurs in the inner of controller.
(Except for the above reasons, the controller must be replaced in case of this
failure.)
5
CN-114F
702#
0#
89
55
1
2
ZX215-1005089
REAR PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT
SOLENOID VALVE
(REAR PUMP)
GND WIRE
CONTROLLER
SIGNAL
CAB
CHASSIS HARNESS
GND WIRE
E451 (abnormality (B) in rear pump proportional solenoid coil current)
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