SANY Crawler Hydraulic Excavator SY195C9, SY205C9, SY215C9, SY225C9. Service Manual - page 27

7-56

Troubleshooting

User Code

Service Code

Trouble

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

52

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

1

Open circuit of 

wire harness

●

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

Between CN-133F 

①

 and pin 98 of controller

Resistance

≤

1 

Ω

Between CN-133F 

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-133F 

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-133F, 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

98

55

1

2

CN-133F

608#

0#

ZX215-1005090

SWING PRIORITY 
SOLENOID VALVE 
SIGNAL OUTPUT PORT

SOLENOID VALVE
(SWING PRIORITY)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E452 (abnormality (A) in swing priority proportional solenoid coil current)

7-57

Troubleshooting

User Code

Service Code

Trouble

Current through the proportional solenoid coil for 

swing priority is abnormal.  

52

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

1

Open circuit of 

wire harness

●

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

Between CN-133F 

①

 and pin 98 of controller

Resistance

≤

1 

Ω

Between CN-133F 

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-133F 

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-133F, 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

98

55

1

2

CN-133F

608#

0#

ZX215-1005090

SWING PRIORITY 
SOLENOID VALVE 
SIGNAL OUTPUT PORT

SOLENOID VALVE
(SWING PRIORITY)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E452 (abnormality (B) in swing priority proportional solenoid coil current)

7-58

Troubleshooting

User Code

Service Code

Trouble

Current through the proportional solenoid coil for bucket 
con

fl

 uence is abnormal. Motion of bucket is slow. 

53

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

1

Open circuit of 

wire harness

●

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

Between CN-134F 

①

 and 99 pin of controller

Resistance

≤

1 

Ω

Between CN-134F 

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-134F 

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-134F, 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

99

55

1

2

CN-134F

604#

0#

ZX215-1005091

BUCKET CONFLUENCE
SOLENOID VALVE 
SIGNAL OUTPUT PORT

SOLENOID VALVE
(BUCKET CONFLU)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E453 (abnormality (A) in bucket confl uence proportional solenoid coil current)

Troubleshooting

User Code

Service Code

Trouble

Current through the proportional solenoid coil for bucket 
con

fl

 uence is abnormal. Motion of bucket is slow. 

53

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

1

Open circuit of 

wire harness

●

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

Between CN-134F 

①

 and pin 99 of controller

Resistance

≤

1 

Ω

Between CN-134F 

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-134F 

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-134F, 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

99

55

1

2

CN-134F

604#

0#

ZX215-1005091

BUCKET CONFLUENCE
SOLENOID VALVE 
SIGNAL OUTPUT PORT

SOLENOID VALVE
(BUCKET CONFLU)

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E453 (abnormality (B) in bucket confl uence proportional solenoid coil current)

Troubleshooting

User 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-135F 

①

 and pin 101 of controller

Resistance

≤

1 

Ω

Between CN-135F 

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-135F 

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-135F, 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-135F

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

E455 (abnormality (A) in boom priority 2 proportional solenoid coil current)

7-61

Troubleshooting

User 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-135F 

①

 and pin 101 of controller

Resistance

≤

1 

Ω

Between CN-135F 

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-135F 

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-135F, 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-135F

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

E455 (abnormality (B) in boom priority 2 proportional solenoid coil current)

Troubleshooting

User 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-132F 

①

 and pin 100 of controller

Resistance

≤

1 

Ω

Between CN-132F 

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-132F 

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-132F, 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

100

55

1

2

CN-132F

607#

0#

ZX215-1005094

SOLENOID VALVE
(DUAL-SPEED TRAVEL)

DUAL SPEED TRAVEL 
SOLENOID VALVE
SIGNAL OUTPUT PORT

GND WIRE

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

GND WIRE

E460 (abnormality in dual speed travel solenoid valve)

Troubleshooting

7.6  

Troubleshooting of Electrical System (E - Mode)

Information in troubleshooting table .......................................................................................... 7-64
E-1  Engine does not start ......................................................................................................... 7-65
E-2  Engine runs rough or is unstable ....................................................................................... 7-67
E-3  Power supply of machine cannot be cut off ....................................................................... 7-68
E-4  Auto idle not functioning ..................................................................................................... 7-70
E-5  Preheating function fails..................................................................................................... 7-71
E-6  Work equipment does not work ......................................................................................... 7-72
E-7 Boom-raise speed or power is low ...................................................................................... 7-73
E-8  Arm speed or power is low ................................................................................................. 7-74
E-9  Bucket speed or power is low ............................................................................................ 7-75
E-10  Travel speed or power is low ........................................................................................... 7-77
E-11  Blank monitor display ....................................................................................................... 7-78
E-12  Monitor displays nothing .................................................................................................. 7-79
E-13  Dual speed travel not functioning..................................................................................... 7-80
E-14  Incorrect engine coolant reading...................................................................................... 7-81
E-15 Incorrect fuel level reading ................................................................................................ 7-82
E-16  Wiper does not work ........................................................................................................ 7-83
E-17  Incorrect arm-in pilot pressure reading ............................................................................ 7-84
E-18  Incorrect arm-out pilot pressure reading .......................................................................... 7-85
E-19  Incorrect boom-raise pilot pressure reading .................................................................... 7-86
E-20  Incorrect boom-lower pilot pressure reading.................................................................... 7-87
E-21  Incorrect bucket-curl pilot pressure reading ..................................................................... 7-88
E-22  Incorrect bucket-dump pilot pressure reading.................................................................. 7-89
E-23  Incorrect swing pilot pressure reading ............................................................................. 7-90
E-24  Incorrect left travel pilot pressure reading ........................................................................ 7-91
E-25  Incorrect right travel pilot pressure reading...................................................................... 7-92

7-64

Troubleshooting

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.

7-65

Troubleshooting

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 trou-
bleshooting.

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 trou-
bleshooting.

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 trou-
bleshooting.

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 nor-
mal 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 trou-
bleshooting.

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 

10

Failure of 

parking unit

●

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

Between CN-801F 2 and 3

Resistance

 

≤

1 

Ω

Unplug connector CN-801F; measure resistance of motor coil. 

App 63 

Ω

7-66

Troubleshooting

0

20

20

22

22

22 13

11

F1

F2

20A

5A

21

10

10

1

2

3 4 5

1

2

3 4 5

21

F16 10A

105

1

2

3 4 5

1

2

3 4 5

0

22

1

2

3 4 5

1

2

3 4 5

1

2

3

6

1

2

3

6

0

E

A

B

P1
P2

64

22

65

63

64
63
65

10

9
6

10

9
6

CN-661F

(S-16)

CN-161F

(S-16)

10
15

10
15

0

13

12

12a

14

47

21

1

2

4

3

1

2

4

3

12a

12a

14

14

10

10

10

47

47

10

E

E

0

0

E

0

L

R S

P

R

B L

P

S

S

L

SW

B

B

1

2

9

12

1

2

9

12

CN-613F

(L-6)

CN-801F

(H-6)

CN-241F

(D-12)

TERMINAL

HEAT

OFF

ON

START

B

BR ACC R1 R2 C

ZX215-1005095

SAFETY RELAY

ALTERNATOR

START MOTOR

START RELAY

HLR CHARGE 
INDICATOR 

PARK RELAY

PARK MOTOR

BATTERY

BATTERY RELAY

PILOT SWITCH

LOCK RELAY

START SWITCH

7-67

Troubleshooting

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

Internal failure 
in sensor

●

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

Between CN-448M A and B   

Resistance

 2.3±0.2 K 

Ω

3

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 B and ground

Resistance

≥

1M 

Ω

4

Internal failure 
of controller

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

5

38

19

B

A

S-2

CN-448M

ZX215-1005096

INPUT SIGNAL

GND

SPEED SENSOR 

SPEED SENSOR

GND

CONTROLLER

SIGNAL

CAB

CHASSIS HARNESS

7-68

Troubleshooting

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 per-
form troubleshooting. 

Between battery relay wire 20# and  wire 21# Resistance

≥

1M

 

Ω

3

4

5

7-69

Troubleshooting

0

20

20

22

22

22 13

11

F1

F2

20A

5A

21

10

10

1

2

3 4 5

1

2

3 4 5

21

F16 10A

105

1

2

3 4 5

1

2

3 4 5

0

22

1

2

3 4 5

1

2

3 4 5

1

2

3

6

1

2

3

6

0

E

A

B

P1
P2

64

22

65

63

64
63
65

10

9
6

10

9
6

CN-661F

(S-16)

CN-161F

(S-16)

10
15

10
15

0

13

12

12a

14

47

21

1

2

4

3

1

2

4

3

12a

12a

14

14

10

10

10

47

47

10

E

E

0

0

E

0

L

R S

P

R

B L

P

S

S

L

SW

B

B

1

2

9

12

1

2

9

12

CN-613F

(L-6)

CN-801F

(H-6)

CN-241F

(D-12)

TERMINAL

HEAT

OFF

ON

START

B

BR ACC R1 R2 C

ZX215-1005095

SAFETY RELAY

ALTERNATOR

START MOTOR

START RELAY

HLR CHARGE 
INDICATOR 

PARK RELAY

PARK MOTOR

BATTERY

BATTERY RELAY

PILOT SWITCH

LOCK RELAY

START SWITCH

7-70

Troubleshooting

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

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 3#  (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 16# and wire 18#.

Resistance

≥

1M 

Ω

Turn on the preheat switch and measure the resistance 
between wire 16# and wire 18# 

≤

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

22

13

16

16

22

20

+

_

+

_

5

4

3

2

1

5

4

3

2

1

21

0

CN-241F

(D-12)

20

22

F1  20A

9

1

1
9

CN-142M

(D-12)

6 6

7

7

CN-131M

(D-12)

F13  160A

21

17

GR-1 GLOW PLUG

18

5

4

3

2

1

5

4

3

2

1

TERMINAL

HEAT

OFF

ON

START

B

BR ACC R1 R2 C

ZX215-1005097

CHASSIS HARNESS

CAB

SWITCH

PREHEAT RELAY

PREHEAT 

BATTERY RELAY

BATTERY

PREHEATER

START SWITCH

CHASSIS HARNESS