SANY Crawler Hydraulic Excavator SY195C9, SY205C9, SY215C9, SY225C9. Service Manual

7-40

Troubleshooting

User Code

Service Code

Trouble

Arm-in pilot pressure is abnormal. Only output alarm
is enabled. .

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

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

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

≤

Between CN-128M 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-128M 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-128M C and ground

Voltage

0.5±0.2V

CN-428M

203#

00#

50#

ZX215-1005076

SIGNAL

GND WIRE

CONTROLLER

GND WIRE

5VPWR SUPPLY

CAB

CHASSIS HARNESS

ARM-IN PILOT
PRESS. SENSOR

ARM-IN PILOT PRESSURE
SIGNAL COLLECTING PORT

E322 (abnormality in arm-in pilot pressure)

Troubleshooting

User Code

Service Code

Trouble

Reading of arm-out pilot pressure is abnormal. Only
output alarm is enabled.

E323

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

Arm-out 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-122M 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-122M C and pin 52 of controller

Resistance

≤

Between CN-122M 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-122M 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-122M C and ground

Voltage

0.5±0.2V

CN-122M

202#

00#

50#

ZX215-1005077

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

ARM-OUT PILOT PRESSURE
SIGNAL COLLECTING PORT

ARM-OUT PILOT
PRESS. SENSOR

E323 (abnormality in arm-out pilot pressure)

7-42

Troubleshooting

User Code

Service Code

Trouble

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

E324

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-raise 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-126M 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-126M C and 70 pin of controller

Resistance

≤

Between CN-126M 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-126M 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-126M C and ground

Voltage

0.5±0.2V

CN-126M

206#

00#

50#

ZX215-1005078

5 V

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BOOM-RAISE PILOT
PRESS. SENSOR

BOOM-RAISE PILOT PRESS.
SIGNAL COLLECTING PORT

E324 (abnormality in boom-raise pilot pressure)

7-43

Troubleshooting

User 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-125M 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-125M C and pin 51 of controller

Resistance

≤

Between CN-125M 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-125M 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-125M C and ground

Voltage

0.5±0.2V

CN-125M

207#

00#

50#

ZX215-1005079

5 V

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BOOM-LOWER PILOT
PRESSURE SENSOR

BOOM-LOWER PILOT PRESS
SIGNAL COLLECTING PORT

E325 (abnormality in boom-lower pilot pressure)

7-44

Troubleshooting

User 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-124M 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-124M C and 69 pin of controller

Resistance

≤

Between CN-124M 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-124M 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-124M C and ground

Voltage

0.5±0.2V

CN-124M

205#

00#

50#

ZX215-1005080

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BUCKET-DIG PILOT
PRESSURE SENSOR

BUCKET-DIG PILOT PRESS.
SIGNAL COLLECTING PORT

E326 (abnormality in bucket-curl pilot pressure)

7-45

Troubleshooting

User 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-128M 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-128M C and pin 50 of controller

Resistance

≤

Between CN-128M 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-128M 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-128M C and ground

Voltage

0.5±0.2V

CN-128M

204#

00#

50#

ZX215-1005081

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

BUCKET-DUMP PILOT PRESS.
SIGNAL COLLECTING PORT

BUCKET-DUMP PILOT
PRESSURE SENSOR

E327 (abnormality in bucket-dump pilot pressure)

7-46

Troubleshooting

User 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.

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-123M 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-123M C and pin 68 of controller

Resistance

≤

Between CN-123M 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-123M 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-123M C and ground

Voltage

0.5±0.2V

CN-123M

208#

00#

50#

ZX215-1005082

5 V

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

SWING PILOT PRESSURE
SIGNAL COLLECTING PORT

SWING PILOT
PRESS. SENSOR

E328 (abnormality in swing pilot pressure

7-47

Troubleshooting

User 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-120M 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-120M C and pin 49 of controller

Resistance

≤

Between CN-120M 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-120M 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-120M C and ground

Voltage

0.5±0.2V

CN-120M

200#

00#

50#

ZX215-1005083

5 V

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

L. TRAVEL PILOT
PRESS. SENSOR

L. TRAVEL PILOT PRESSURE
SIGNAL COLLECTING PORT

E329 (abnormality in left travel pilot pressure)

7-48

Troubleshooting

User 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-121M 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-121M C and pin 67 of controller

Resistance

≤

Between CN-121M 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-121M 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-121M C and ground

Voltage

0.5±0.2V

CN-121M

201#

00#

50#

ZX215-1005084

5 V

SIGNAL

CONTROLLER

GND WIRE

5VPWR SUPPLY

GND WIRE

CAB

CHASSIS HARNESS

R. TRAVEL PILOT PRESSURE
SIGNAL COLLECTING PORT

R. TRAVEL PILOT
PRESS. SENSOR

E330 (abnormality in right travel pilot pressure)

7-49

Troubleshooting

User 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-302F

①

and

③

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-302F

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 per-
form troubleshooting.

Between CN-302F

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-302F

②

and ground

Voltage

≤

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%

CN-142M

CN-131M

CN-302F

50#

506#

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)

7-50

Troubleshooting

User 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-113M

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 per-
form troubleshooting.

Between CN-113M

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 per-
form troubleshooting.

Between CN-113M

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-113M

②

and ground

Voltage

About 24V

CN-113M

CN-152M

ZX215-1005086

240

CONTROLLER

HYDRAULIC OIL
TEMP SENSOR

SIGNAL

24V PWR
SUPPLY

24V

PWR SUPPLY

CAB

CHASSIS HARNESS

HYDRAULIC OIL
TEMP SENSOR

E237 (abnormality in hydraulic oil temperature)

7-51

Troubleshooting

User Code

Service Code

Trouble

Engine speed is abnormal. Only output alarm is en-
abled.

E541

Failure description

CPU detects out that engine speed is too low (below 100 rpm).

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

Normal condi-

tion

●

Code 41 will be displayed on the monitor when engine start switch is
turned from the OFF position to the ON position. This is normal as the en-
gine is not started.

Open circuit of

wire harness

●

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

Between CN-448M

①

and pin 38 of controller

Resistance

≤

Between CN-448M

②

and pin 19 of controller

≤

Short circuit of

wire harness

(grounded)

●

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

Between CN-448M

①

and ground

Resistance

≥

Failure of sen-

sor

●

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

Unplug the connector CN-448M, and measure the

resistance between the speed sensors's

①

and

②

Resistance 2.3±0.2k

E541 (abnormality in engine speed)

CN-448M

108A

108B

ZX215-1005087

PROBING

ENGINE SPEED

ENGINE SPEED
SENSOR

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

7-52

Troubleshooting

User 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-113F

①

and pin 88 of controller

Resistance

≤

Between CN-113F

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-113F

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-113F, 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-113F

702#

ZX215-1005088

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

SOLENOID VALVE
(FRONT PUMP)

FRONT PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

E450 (abnormality (a) in front pump proportional solenoid coil current)

7-53

Troubleshooting

User 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-113F

①

and pin 88 of controller

Resistance

≤

Between CN-113F

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-113F

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-113F, 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-113F

702#

ZX215-1005088

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

SOLENOID VALVE
(FRONT PUMP)

FRONT PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

E450 (abnormality (b) in front pump proportional solenoid coil current)

7-54

Troubleshooting

User 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-114F

①

and pin 89 of controller

Resistance

≤

Between CN-114F

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-114F

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-114F, 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-114F

702#

ZX215-1005089

REAR PUMP
SOLENOID VALVE
SIGNAL OUTPUT PORT

SOLENOID VALVE
(REAR PUMP)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E451 (abnormality (a) in rear pump proportional solenoid coil current)

7-55

Troubleshooting

User 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-114F

①

and pin 89 of controller

Resistance

≤

Between CN-114F

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-114F

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-114F, 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-114F

702#

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)

SANY Crawler Hydraulic Excavator SY195C9, SY205C9, SY215C9, SY225C9. Service Manual - page 26