SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual - page 27

Troubleshooting

SY215C

LC

7-58

E455 Boom priority 2 proportional solenoid coil current abnormal A

Failure Code

Service Code

Trouble

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

55

E455

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

—

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-435F 

①

 and pin 101 of controller

Resistance

≤

1

Ω

Between CN-435F 

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-435F 

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-435F, 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

 

101

55

1

2

CN-435F

603#

0#

ZX215-1005093

BOOM PRIORITY 2
SOLENOID VALVE 
SIGNAL OUTPUT PORT

  

SOLENOID VALVE
(BOOM PRIORITY 2 )

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

LC

7-59

E455 Boom priority 2 proportional solenoid coil current abnormal B

Failure Code

Service Code

Trouble

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

55

E455

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

1

Open circuit of 

wire harness

 

★

 Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting. 
Between CN-435F 

①

 and pin 101 of controller

Resistance

≤

1

Ω

Between CN-435F 

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-435F 

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-435F, 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

 

101

55

1

2

CN-435F

603#

0#

ZX215-1005093

BOOM PRIORITY 2
SOLENOID VALVE 
SIGNAL OUTPUT PORT

  

SOLENOID VALVE
(BOOM PRIORITY 2 )

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

LC

7-60

E460 Dual speed travel solenoid valve abnormal

Failure Code

Service Code

Trouble

Connection of the solenoid coil for dual speed travel is 
abnormal. High speed travel is not functioning. 

60

E460

Failure description

Abnormality, open circuit or short circuit occurs in the proportional solenoid coil. 

Response from controller Only output alarm is enabled.  
Symptom of machine

High speed travel is not functioning. 

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-431F 

①

 and pin 100 of controller

Resistance

≤

1

Ω

Between CN-431F 

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-431F 

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-431F, 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

82

55

1

2

CN-431F

607#

0#

 

SOLENOID VALVE
(DUAL-SPEED TRAVEL)

DUAL SPEED TRAVEL 
SOLENOID VALVE
SIGNAL OUTPUT PORT

  

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

Troubleshooting

SY215C

LC

7-61

7.5.2  

Troubleshooting of Electrical System (E - Code)

Information in troubleshooting table .......................................................................................... 7-62
E-1  Engine does not start ......................................................................................................... 7-63
E-2  Engine runs rough or is unstable ....................................................................................... 7-65
E-3  Power supply of machine cannot be cut off ....................................................................... 7-66
E-4  Auto idle not functioning ..................................................................................................... 7-67
E-5  Preheating function fails..................................................................................................... 7-68
E-6  Work equipment does not work ......................................................................................... 7-69
E-7 Boom-raise speed or power is low ...................................................................................... 7-70
E-8  Arm speed or power is low ................................................................................................. 7-71
E-9  Bucket speed or power is low ............................................................................................ 7-72
E-10  Travel speed or power is low ........................................................................................... 7-74
E-11  Blank monitor display ....................................................................................................... 7-75
E-12  Monitor displays nothing .................................................................................................. 7-76
E-13  Dual speed travel not functioning..................................................................................... 7-77
E-14  Incorrect engine coolant reading...................................................................................... 7-78
E-15 Incorrect fuel level reading ................................................................................................ 7-79
E-16  Wiper does not work ........................................................................................................ 7-80
E-17  Incorrect arm-in pilot pressure reading ............................................................................ 7-81
E-18  Incorrect arm-out pilot pressure reading .......................................................................... 7-82
E-19  Incorrect boom-raise pilot pressure reading .................................................................... 7-83
E-20  Incorrect boom-lower pilot pressure reading.................................................................... 7-84
E-21  Incorrect bucket-curl pilot pressure reading ..................................................................... 7-85
E-22  Incorrect bucket-dump pilot pressure reading.................................................................. 7-86
E-23  Incorrect swing pilot pressure reading ............................................................................. 7-87
E-24  Incorrect left travel pilot pressure reading ........................................................................ 7-88
E-25  Incorrect right travel pilot pressure reading...................................................................... 7-89

Troubleshooting

SY215C

LC

7-62

Information in troubleshooting table

Trouble

Trouble which occurs on the machine

Related information

Information related to detected trouble or troubleshooting

Possible causes and standard value in normal state

Cause

Standard value in normal state and remarks on troubleshooting

1

Possible causes of 
trouble (Given num-
bers are reference 
numbers, which do 
not indicate priority)

< Description >

 

●

Standard value in normal state, which is used to judge possible 
causes that might be OK or N/G. 

 

●

A reference value is used to determine OK or N/G. 

2

3

4

5

Related circuit diagram

This is part of the circuit diagram which shows the portion where the failure occurred.

 

●

Connector No.: A connector number Indicates a connector.

 

●

Arrow: An arrow roughly indicates the installing location. 

 

★

The following information is contained in the troubleshooting table and related electric circuit 
diagrams. Fully understand these information before carrying out troubleshooting.

Troubleshooting

SY215C

LC

7-63

E-1  Engine does not start

Trouble

Engine cannot be started. 

Related information

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Low battery 

capacity

 

★

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

Battery voltage

Voltage

≥

24V

2

Internal fail-

ure of start 

switch

 

★

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

OFF position: between wire 22# and wire 11# 

Resistance

≥

1M

Ω

 

3

Failure of 

pilot switch

 

★

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

Lockout lever FREE position: between 105 # and 27# wire

Resistance

 

≤

1

Ω

Lockout lever LOCKED position: between wire 105#  and 27# 

≥

1 M 

Ω

 

4

Failure of 

start motor

 

★

  Turn engine start switch to OFF position. Keep the engine running during trouble-
shooting. (When all power supplies, grounding, signal and engine inputs are 
normal except engine output, it is the failure of  start motor)

Engine start motor

Start switch Voltage

Power supply: Terminal B and ground

Start

20~30V

Between engine input terminal S and ground

20~30V

5

Open circuit 

of wire har-

ness

 

★

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

Wire 21#  and start motor terminal B

Resistance

≤

1

Ω

 

Wire 12#  and start relay terminal SW

≤

1

Ω

 

Start relay terminal L and safety relay terminal S

≤

1

Ω

 

6

Failure of 

fuse F1

Battery terminal "+" (wire 20#) and control dial wire 22#

Resistance

≤

1

Ω

 

7

Short cir-

cuit of wire 

harness 

(grounded)

 

★

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

Start relay terminal SW  and ground

Resistance

≥

1 M 

Ω

 

Engine input terminal S and ground

≥

1 M 

Ω

 

8

Internal 

failure of 

alternator

 

★

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

Alternator terminal P and ground

Voltage

≤

1V 

9 Start relay

 

★

Turn engine start switch to OFF position. Move it to START position when per-
forming troubleshooting.

Terminal SW and ground

Voltage

App. 24V 

Terminal S and ground

App. 24V 

Troubleshooting

SY215C

LC

7-64

ZX215-1005095

PREHEATER 

K7  PREHEAT RELAY

K3 START RELAY

R2

START SWITCH

HEAT

ON

OFF

TERMINAL

R1

START

B2

17

21

0

21

20

22

0

ALTERNATOR

G

START MOTOR

BAT. RELAY

B1

BATTERY

BAT-1

+

-

-

+

0

D1

：

6A10

F6-2A

21

70

0

TRAVEL ALARM

630

K11

TRAVEL ALARM RELAY

21

14

ACC

C

B BR

SQ1 PILOT CONTROL LEVER

27

21

F14-10A

K10 PILOT RELAY

610

PILOT
SOLENOID
VALVE

0

D4:1N5408

105

11

71

HL2: CHARGING INDICATOR

12

F2-5A

105

0

22

21

21

13

D0

：

P600G

16

S

E

M1

B

M

11

F1-20A

L

R

B

E

k1

125

A

809

⑤

④

③

②

①

①

②

13

⑤

④

③

0

10

10a

DIODE 6A10

DIODE 

6A10

Troubleshooting

SY215C

LC

7-65

E-2  Engine runs rough or is unstable

Trouble

Engine Runs Rough or Is Unstable

Related information

Engine speed can be read on the monitor.

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. 

Unplug the connector controller, and measure 

the resistance between pin 19 and pin 38. 

Resistance

 2.3±0.2 K

Ω

2

3

4

5

ZX215-1005399

ECM

CAN

SPEED SENSOR 
INPUT SIGNAL

CONTROLLER

CAB

CHASSIS HARNESS

SPEED SENSOR

SIGNAL

Troubleshooting

SY215C

LC

7-66

E-3  Power supply of machine cannot be cut off

Trouble

Engine cannot be stopped. 

Related information

Engine stalls when start switch it turned to OFF position. There is no time 
delay for power cutout.

Possible causes and standard value in normal 

state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of bat-
tery relay

When engine start switch is operated, if the operation of battery 
relay contact is heard, the battery is normal. Turn the start switch 
OFF

→

ON

→

OFF.

2

Breakdown of 
surge diode 

 

★

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

Between battery relay wire 20# and  wire 21# Resistance

≥

1M

Ω

 

3

4

ZX215-1005095

PREHEATER 

K7  PREHEAT RELAY

K3 START RELAY

R2

START SWITCH

HEAT

ON

OFF

TERMINAL

R1

START

B2

17

21

0

21

20

22

0

ALTERNATOR

G

START MOTOR

BAT. RELAY

B1

BATTERY

BAT-1

+

-

-

+

0

D1

：

6A10

F6-2A

21

70

0

TRAVEL ALARM

630

K11

TRAVEL ALARM RELAY

21

14

ACC

C

B BR

SQ1 PILOT CONTROL LEVER

27

21

F14-10A

K10 PILOT RELAY

610

PILOT
SOLENOID
VALVE

0

D4:1N5408

105

11

71

HL2: CHARGING INDICATOR

12

F2-5A

105

0

22

21

21

13

D0

：

P600G

16

S

E

M1

B

M

11

F1-20A

L

R

B

E

k1

125

A

809

⑤

④

③

②

①

①

②

13

⑤

④

③

0

10

10a

DIODE 6A10

DIODE 

6A10

Troubleshooting

SY215C

LC

7-67

E-4  Auto idle not functioning

Trouble

Auto idle speed do not work

Related information

Engine speed do not decrease wen the mode is auto idle speed and grip keeps 
still in "NEUTRAL" position

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Error of boom-

raise signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

    0   KG

Lever in operation, pressure signal transmitted

    0~39 KG

2

Error of boom-

lower signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting.

 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

3

Error of arm-in 

signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

4

Error of arm-out 

signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

5

Error of bucket-

curl signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

6

Error of Bucket-

dump signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

7

Error of swing 

signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting.

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

8

Error of travel 

signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

9

Error of attach-

ment signal

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting.

Levers in NEUTRAL, pressure signal transmitted

Pressure

0   KG

Lever in operation, pressure signal transmitted

 0~39 KG

10

Failure of con-

troller

No troubleshooting can be done for it is internal failure. (If it is not caused by 
one of the factors listed above, it should be the failure of controller.)

Troubleshooting

SY215C

LC

7-68

E-5  Preheating function fails

Trouble

Engine does not preheat. 

Related information

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of pre-

heat fuse

 

★

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

Between wire 21# and preheat relay pin 16#  (contact)

Resistance

≤

1

Ω

2

Failure of pre-

heat relay

When the preheating function is activated, if operation of the preheat relay 
contact is heard, the relay is normal. The preheat switch is to be switched 
OFF

→

ON

→

OFF.

3

Failure of pre-

heat switch

 

★

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

 

Turn off the preheat switch and measure the resistance 
between wire 809# and wire 0#.

Resistance

≥

1M

Ω

Turn on the preheat switch and measure the resistance 
between wire 809# and wire 0# 

≤

1

Ω

4

Short circuit 

of wire har-

ness (ground-

ed)

 

★

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

Between preheat relay pin 3#  (contact) and ground

Resistance

≥

1M

Ω

5

ZX215-1005097

22

BR

B

C

ACC

21

D1

：

6A10

+

-

-

+

BAT-1

BATTERY

BATTERY RELAY

B1

22

20

0

17

START

R1

TERMINAL

OFF

ON

HEAT

START SWITCH

R2

K7 PRHEAT RELAY 

PREHEATER 

DIODE 6A10

0

13

809

A

125

k1

F1-20A

16

D0

：

P600G

13

Troubleshooting

SY215C

LC

7-69

E-6  Work equipment does not work

Trouble

The machine is motionless while operated after starting. 

Related information

Possible causes and standard value in normal 

state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of lockout  

switch

 

★

 Turn engine start switch to OFF position. Start the engine and keep it 
running to perform troubleshooting. 

Item

Lockout control lever

Resistance

Between wire 105# and wire 27# 

LOCK 

≤

1

Ω

FREE

  

≥

1M

Ω

2

Short circuit of 

wire harness 

(grounded)

 

★

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

 

Between 105# and ground

Resistance

≥

1M

Ω

3

4

ZX215-1005098

22

105

D4:1N5408

0

PILOT
SOLENOID
VALVE

610

K10 PILOT RELAY

F14-10A

27

SQ1 PILOT  CONTROL

BR

B

C

ACC

21

D1

：

6A10

+

-

-

+

BAT-1

B1

22

20

0

START

R1

TERMINAL

OFF

ON

HEAT

R2

13

①

②

③

④
⑤

k1

F1-20A

D0

：

P600G

13

Troubleshooting

SY215C

LC

7-70

E-7 Boom-raise speed or power is low

Trouble

Boom-raise speed or power is low. 

Related information

Pilot pressure of the boom in operation can be 

checked on the monitor. 

Possible causes and standard value in nor-

mal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of sen-

sor

 

★

 Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting. 

Levers in NEUTRAL, boom-raise pressure signal

Pressure

0 KG

Lever in operation, boom-raise pressure signal

0~39 KG

2

Short circuit 

of harness 

(grounded)

 

★

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

 

Between harness ( from controller pin 70 to CN-426M  
A) and ground

Resistance

≥

1M

Ω

3

Open circuit of 

harness

 

★

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

 

Between controller pin 54 and CN-426M B

Resistance

≤

1

Ω

4

Failure of con-

troller

No troubleshooting can be done due to internal failure. (Failure lies in the con-
troller if the reasons above are ruled out)

  CN-426M

DF-3

A

B

C

56

54

70

ZX215-1005099

CHASSIS HARNESS

CAB

BOOM UP 
PRESS. SENSOR

SIGNAL

5V

GND WIRE

CONTROLLER

SENSOR 5V

SENSOR GND WIRE

BOOM UP
PRESSURE SENSOR

Troubleshooting

SY215C

LC

7-71

E-8  Arm speed or power is low

Trouble

Arm speed or power is low during operation.

Related information

Pilot pressure of the arm in operation can be checked on the monitor. 

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of sen-

sor

 

★

 Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting. 

Levers in NEUTRAL, arm-in and arm-out pressure 
signals

Pressure

0 KG

Levers in operation, arm-in and dump pressure signal

0~39 KG

2

Short circuit 

of harness 

(grounded)

 

★

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

Between harness (from controller pin 71 to CN-428M  
A) and ground
Between harness (from controller pin 52 to CN-422M  
A) and ground

Resistance

≥

1M

Ω

3

Open circuit of 

harness

 

★

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

Between controller pin 54  and CN-428M B
Between controller pin 54 and CN-422M B

Resistance

≤

1

Ω

4

Failure of con-

troller

No troubleshooting can be done due to internal failure. (Failure lies in the con-
troller if the reasons above are ruled out)

52

71

54

56

A

C

B

A

C

B

CN-422M

DF-3

CN-428M

DF-3

ZX215-1005119

CHASSIS HARNESS

SIGNAL

GND WIRE

ARM-IN
PRESS. SENSOR

GND WIRE

ARM-OUT
PRESS. SENSOR

5V

5V

SIGNAL

CONTROLLER

ARM-OUT
PRESS SENSOR

ARM-IN
PRESS SENSOR

SENOSR 5V

CAB

SENSOR GND WIRE

Troubleshooting

SY215C

LC

7-72

E-9  Bucket speed or power is low

Trouble

Bucket speed or power  is low during operation. 

Related information

Pilot pressure of the bucket can be checked on the monitor. 

Possible causes and standard value in normal state

Cause

Standard value in normal state/Remarks on troubleshooting

1

Failure of 

sensor

 

★

 Turn engine start switch to OFF position. Start the engine and keep it running 
to perform troubleshooting. 

Levers in NEUTRAL, bucket-curl/dump pressure signals

Pressure

0 KG

Levers in operation, bucket-curl/dump pressure signals

0~39 KG

2

Short circuit 

of harness 

(grounded)

 

★

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

 

Between harness (from controller pin 69 to CN-424M  A) 
and ground
Between harness (from controller pin 50 to CN-427M  A) 
and ground

Resistance

≥

1M

Ω

3

Open circuit 

of harness

 

★

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

Between controller pin 54 and CN-424M B
Between controller pin 54 and CN-427M B

Resistance

≤

1

Ω

4

Defective 

bucket  

con

fl

 uence 

solenoid 

valve

 

★

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

Between CN-434F 1 and 2

Resistance

About 

17.5

Ω

5

Failure of 

controller

No troubleshooting can be done due to internal failure. (Failure lies in the control-
ler if the reasons above are ruled out)

Troubleshooting

SY215C

LC

7-73

A

C

B

A

C

B

1

2

CN-427M

DF-3

CN-424M

DF-3

  CN-434F

AMP-2

50

69

54

56

99

ZX215-1005100

BUCKET CONFLUENCE
PROPORTIONAL VALVE

5V

5V

CAB

CHASSIS HARNESS

SIGNAL

GND WIRE

BUCKET-CURL
PRESS. SENSOR

SIGNAL

GND WIRE

BUCKET-DUMP
PRESS. SENSOR

SIGNAL

GND WIRE

BUCKET 
CONFLUENCE SIGNAL

CONTROLLER

BUCKET-CURL
PRESS. SENSOR

BUCKET-DUMP
PRESS. SENSOR

SENOSR 5V

SENSOR GND WIRE