SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual

Troubleshooting

SY215C

7-42

E325 Boom-down pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of boom-lower pilot pressure is abnormal.
Only output alarm is enabled. .

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

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-425M A and B

Voltage

About 5V

Open circuit

of signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-425M C and pin 51 of controller

Resistance

≤

Between CN-425M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-425M C and ground

Resistance

≥

Failure of

sensor

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-425M C and ground

Voltage

0.5±0.2V

5 V

CN-425M

207#

00#

50#

ZX215-1005079

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BOOM-LOWER PILOT
PRESSURE SENSOR

BOOM-LOWER PILOT PRESS
SIGNAL COLLECTING PORT

Troubleshooting

SY215C

7-43

E326 Bucket-dig pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of bucket-curl pilot pressure is abnormal.
Only output alarm is enabled. .

E326

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

Bucket-curl motion is low.

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-424M A and B

Voltage

About 5V

Open circuit of

signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-424M C and 69 pin of controller

Resistance

≤

Between CN-424M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-424M C and ground

Resistance

≥

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-424M C and ground

Voltage

0.5±0.2V

CN-424M

205#

00#

50#

ZX215-1005080

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BUCKET-DIG PILOT
PRESSURE SENSOR

BUCKET-DIG PILOT PRESS.
SIGNAL COLLECTING PORT

Troubleshooting

SY215C

7-44

E327 Bucket-dump pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of Bucket-dump pilot pressure is abnormal.
Only output alarm is enabled. .

E327

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

Bucket-dump motion is low

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-427M A and B

Voltage

About 5V

Open circuit of

signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-427M C and pin 50 of controller

Resistance

≤

Between CN-427M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-427M C and ground

Resistance

≥

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting

Between CN-427M C and ground

Voltage

0.5±0.2V

CN-427M

204#

00#

50#

ZX215-1005081

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BUCKET-DUMP PILOT PRESS.
SIGNAL COLLECTING PORT

BUCKET-DUMP PILOT
PRESSURE SENSOR

Troubleshooting

SY215C

7-45

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-423M A and B

Voltage

About 5V

Open circuit of

signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-423M C and pin 68 of controller

Resistance

≤

Between CN-423M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-423M C and ground

Resistance

≥

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at OFF position to
perform troubleshooting.

Between CN-423M C and ground

Voltage

0.5±0.2V

E328 Swing pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of swing pilot pressure is abnormal. Only
output alarm is enabled. .

E328

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

Swinging motion is slow.

CN-423M

208#

00#

50#

ZX215-1005082

5 V

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

SWING PILOT PRESSURE
SIGNAL COLLECTING PORT

SWING PILOT
PRESS. SENSOR

Troubleshooting

SY215C

7-46

E329 Left travel pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of left travel pilot pressure is abnormal.
Only output alarm is enabled. .

E329

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

Left travel speed is low. Travel deviates.

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-420M A and B

Voltage

About 5V

Open circuit of

signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-420M C and pin 49 of controller

Resistance

≤

Between CN-420M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-420M C and ground

Resistance

≥

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at OFF position to
perform troubleshooting.

Between CN-420M C and ground

Voltage

0.5±0.2V

5 V

CN-420M

200#

00#

50#

ZX215-1005083

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

L. TRAVEL PILOT
PRESS. SENSOR

L. TRAVEL PILOT PRESSURE
SIGNAL COLLECTING PORT

Troubleshooting

SY215C

7-47

E330 Right travel pilot pressure abnormal

Failure Code

Service Code

Trouble

Reading of right travel pilot pressure is abnormal.
Only output alarm is enabled. .

E330

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

Right travel speed is low. Travel deviates.

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
Between CN-421M A and B

Voltage

About 5V

Open circuit of

signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-421M C and pin 67 of controller

Resistance

≤

Between CN-421M B and ground

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-421M C and ground

Resistance

≥

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-421M C and ground

Voltage

0.5±0.2V

CN-421M

201#

00#

50#

ZX215-1005084

5 V

SIGNAL

CONTROLLER

GND WIRE

5V PWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

R. TRAVEL PILOT PRESSURE
SIGNAL COLLECTING PORT

R. TRAVEL PILOT
PRESS. SENSOR

Troubleshooting

SY215C

7-48

E231 Fuel control dial set voltage abnormal

Failure Code

Service Code

Trouble

Voltage setting of fuel control dial is abnormal. En-
gine returns to auto idle.

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

Failure of 5V

power supply

★

Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.

Between CN-300F

①

and

③

Voltage

About 5V

Open circuit

of signal wire

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-300F

②

and pin 34 of controller

Resistance

≤

Short circuit

of signal wire

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Between CN-300F

②

and ground

Resistance

≥

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-300F

②

and ground

Voltage

≤

Defective

knob

★

Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.

Unplug the connector CN-300F, and measure
the resistance between dial

①

and

③

Resistance 5K±15%

CN-134M

CN-314M

CN-300F

50#

506#

ZX215-1005085

FUEL CTRL
DIAL

SENSOR 5V

YELLOW

BLUE

RED

FUEL CONTROL DIAL
SET VOLTAGE

CAB

GND WIRE

Troubleshooting

SY215C

7-49

E237 Hydraulic oil temperature abnormal

Failure Code

Service Code

Trouble

Hydraulic oil temperature is abnormal. Only output
alarm is enabled.

E237

Failure description

A voltage other than 0.2 – 4.75V, transformed from hydraulic oil temperature
that is detected by controller, keeps more than 200msec.

Response from controller

Only output alarm is enabled. The alarm resets automatically when conditions
become normal.

Symptom of machine

—

Possible causes and standard value in normal

state

Cause

Standard value in normal state/Remarks on troubleshooting

Failure of sen-

sor

★

Turn engine start switch to OFF position. Then, keep it at OFF position to
perform troubleshooting.
Between CN-440M

①

and ground

Voltage

0.2~4.75V

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to
perform troubleshooting.

Between CN-440M

①

and pin 31 of controller Resistance

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to
perform troubleshooting.

Between CN-440M

①

and ground

Resistance

≥

Failure of 24V

power supply

★

Turn engine start switch to OFF position. Keep it at ON position to perform
troubleshooting.

Between CN-440M

②

and ground

Voltage

About 24V

240

Ω

CN-440M

ZX215-1005086

CONTROLLER

HYDRAULIC OIL
TEMP SENSOR

SIGNAL

24V PWR
SUPPLY

24V

PWR SUPPLY

CAB

CHASSIS HARNESS

HYDRAULIC OIL
TEMP SENSOR

Troubleshooting

SY215C

7-50

E450 Front pump proportional solenoid coil current abnormal A

Failure Code

Service Code

Trouble

Front pump proportional solenoid coil current is ab-
normal. The system operates slowly.

E450

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
1.8A 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

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-445F

①

and pin 88 of controller

Resistance

≤

Between CN-445F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-445F

①

and wire 0#

Resistance

≥

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-445F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-445F

702#

ZX215-1005088

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

SOLENOID VALVE
(FRONT PUMP)

FRONT PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

Troubleshooting

SY215C

7-51

E450 Front pump proportional solenoid coil current abnormal B

Failure Code

Service Code

Trouble

Front pump proportional solenoid coil current is ab-
normal. The system operates slowly.

E450

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

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-445F

①

and pin 88 of controller

Resistance

≤

Between CN-445F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-445F

①

and wire 0#

Resistance

≥

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-445F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-445F

702#

ZX215-1005088

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

SOLENOID VALVE
(FRONT PUMP)

FRONT PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

Troubleshooting

SY215C

7-52

E451 Rear pump proportional solenoid coil current abnormal A

Failure Code

Service Code

Trouble

Rear pump proportional solenoid coil current is ab-
normal. The system operates slowly.

E451

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
1.8 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

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-444F

①

and pin 89 of controller

Resistance

≤

Between CN-444F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-444F

①

and wire 0#

Resistance

≥

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-444F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-444F

703#

ZX215-1005089

REAR PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(REAR PUMP)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

7-53

E451 Rear pump proportional solenoid coil current abnormal B

Failure Code

Service Code

Trouble

Rear pump proportional solenoid coil current is abnor-
mal. The system operates slowly.

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

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-444F

①

and pin 89 of controller

Resistance

≤

Between CN-444F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-444F

①

and wire 0#

Resistance

≥

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-444F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-444F

703#

ZX215-1005089

REAR PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(REAR PUMP)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

7-54

E452 Swing priority proportional solenoid coil current abnormal A

Failure Code

Service Code

Trouble

Current through the proportional solenoid coil for
swing priority is abnormal.

E452

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
1.8A lasts for 1 second. Differential current occurs in drive protection loop.

Response from controller

Operation of solenoid coil is stopped when failure is detected. Power supply
must be restored.

Symptom of machine

—

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-433F

①

and pin 98 of controller

Resistance

≤

Between CN-433F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-433F

①

and wire 0#

Resistance

≥

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-433F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-433F

608#

ZX215-1005090

SWING PRIORITY
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(SWING PRIORITY)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

7-55

E452 Swing priority proportional solenoid coil current abnormal B

Failure Code

Service Code

Trouble

Current through the proportional solenoid coil for

swing priority is abnormal.

E452

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
0.1A lasts for 1 second. Differential current occurs in drive protection loop.

Response from controller

Operation of solenoid coil is stopped when failure is detected. Power supply
must be restored.

Symptom of machine

—

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-433F

①

and pin 98 of controller

Resistance

≤

Between CN-433F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-433F

①

and wire 0#

Resistance

≥

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-4133F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-433F

608#

ZX215-1005090

SWING PRIORITY
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(SWING PRIORITY)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

7-56

E453 Bucket confl uence proportional solenoid coil current abnormal A

Failure Code

Service Code

Trouble

Current through the proportional solenoid coil for bucket
con

uence is abnormal. Motion of bucket is slow.

E453

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
1.8 A lasts for 1 second. Differential current occurs in drive protection loop.

Response from controller

Operation of solenoid coil is stopped when failure is detected. Power supply
must be restored.

Symptom of machine

Motion of bucket is slow.

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-434F

①

and 99 pin of controller

Resistance

≤

Between CN-434F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-434F

①

and wire 0#

Resistance

≥

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-434F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-434F

604#

ZX215-1005091

BUCKET CONFLUENCE
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(BUCKET CONFLUENCE)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

7-57

E453 Bucket confl uence proportional solenoid coil current abnormal B

Failure Code

Service Code

Trouble

Current through the proportional solenoid coil for bucket
con

uence is abnormal. Motion of bucket is slow.

E453

Failure description

Abnormality occurs in loaded circuit of proportional solenoid coil. Current above
0.1A lasts for 1 second. Differential current occurs in drive protection loop.

Response from controller

Operation of solenoid coil is stopped when failure is detected. Power supply
must be restored.

Symptom of machine

Motion of bucket is slow.

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

Open circuit of

wire harness

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-434F

①

and pin 99 of controller

Resistance

≤

Between CN-434F

②

and ground

≤

Short circuit of

wire harness

(grounded)

★

Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.

Between CN-434F

①

and wire 0#

Resistance

≥

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-434F, and measure the
resistance between solenoid valve's

①

and

②

Resistance

17.5

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.)

CN-434F

604#

ZX215-1005091

BUCKET CONFLUENCE
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(BUCKET CONFLUENCE)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual - page 26