SANY Crawler Hydraulic Excavator (SY195C9, SY205C9, SY215C9, SY225C9). Shop Manual (2013) - page 23
Troubleshooting
E-5 Preheating function fails
Trouble
Engine does not preheat.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Failure of pre-
1
troubleshooting.
heat fuse
Between wire 21# and preheat relay pin 3# (contact)
Resistance
1 ȍ
When the preheating function is activated, if operation of the preheat relay
Failure of pre-
2
contact is heard, the relay is normal. The preheat switch is to be switched
heat relay
OFFĺONĺOFF.
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Failure of pre-Turn off the preheat switch and measure the resistance
3
1M ȍ
heat switch
between wire 16# and wire 18#.
Resistance
Turn on the preheat switch and measure the resistance
1 ȍ
between wire 16# and wire 18#
Short circuit
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
of wire har-
4
ness (ground-
Between preheat relay pin 3# (contact) and ground
Resistance
1M ȍ
ed)
5
START SWITCH
TERMINAL
B
BR
ACC
R1
R2
C
HEAT
OFF
ON
20
START
BATTERY
CN-241F
22
13
16
_
_
(D-12)
+
+
22
1
1
F1 20A
20
22
9
9
16
BATTERY RELAY
1
2
3
4
5
PREHEAT RELAY
1
2
3
4
5
PREHEAT
21
F13 160A
21
SWITCH
CN-131M
CN-142M
1
2
3
4
5
0
(D-12)
(D-12)
1
2
3
4
5
18
GR-1 GLOW PLUG
7
7
6
6
17
PREHEATER
CHASSIS HARNESS
CAB
CHASSIS HARNESS
ZX215-1005097
7-71
Troubleshooting
E-6 Work equipment does not work
Trouble
The machine is motionless while operated after starting.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Start the engine and keep it
running to perform troubleshooting.
Failure of lockout
Item
Lockout control lever
Resistance
1
switch
LOCK
1 ȍ
Between wire 105# and wire 27#
FREE
1M ȍ
Short circuit of
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
2
wire harness
form troubleshooting.
Between 105# and ground
Resistance
1M ȍ
(grounded)
Failure of coil
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
3
inside lockout
form troubleshooting.
Between CN-136F 1 and 2
Resistance
About 34 ȍ
solenoid valve
4
CN-106F
PILOT SWITCH
čAMP-2Ď
F16 10A
21
27
27
105
2
2
B-
1
1
CN-161F
(S-16)
2
2
10
10
12
12
0
105
27
606
CN-661F
CN-136F
1
2
3
45
čS-16Ď
čAMP-2Ď
1
2
3
45
1
1
1
1
8
8
2
2
PILOT SOLENOID VALVE
CAB
CHASSIS HARNESS
ZX215-1005098
7-72
Troubleshooting
E-7 Boom-raise speed or power is low
Trouble
Boom-raise speed or power is low.
Pilot pressure of the boom in operation can be
Related information
checked on the monitor.
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting.
Failure of sen-
1
Levers in NEUTRAL, boom-raise pressure signal
0 KG
sor
Pressure
Lever in operation, boom-raise pressure signal
0~39 KG
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Short circuit
troubleshooting.
2
of harness
Between harness ( from controller pin 70 to CN-126M
Resistance
1M ȍ
(grounded)
A) and ground
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Open circuit of
3
troubleshooting.
harness
Between controller pin 54 and CN-126M B
Resistance
1 ȍ
Failure of con-
No troubleshooting can be done due to internal failure. (Failure lies in the con-
4
troller
troller if the reasons above are ruled out)
CONTROLLER
CN-126M
BOOM UP
čDF-3Ď
PRESS. SENSOR
BOOM UP
70
A
SIGNAL
PRESSURE SENSOR
SENSOR GND WIRE
54
B
GND WIRE
SENSOR 5V
56
C
5V
CAB
CHASSIS HARNESS
ZX215-1005099
7-73
Troubleshooting
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.
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting.
Failure of sen-
Levers in NEUTRAL, arm-in and arm-out pressure
1
0 KG
sor
signals
Pressure
Levers in operation, arm-in and dump pressure
0~39 KG
signal
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Short circuit
Between harness (from controller pin 71 to CN-
2
of harness
128M A) and ground
Resistance
1M ȍ
(grounded)
Between harness (from controller pin 52 to CN-
122M A) and ground
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
form troubleshooting.
3
harness
Between controller pin 54 and CN-128M B
Resistance
1 ȍ
Between controller pin 54 and CN-122M B
Failure of con-
No troubleshooting can be done due to internal failure. (Failure lies in the
4
troller
controller if the reasons above are ruled out)
ARM-OUT
CN-122M
PRESS. SENSOR
čDF-3Ď
A
SIGNAL
B
GND WIRE
C
5V
CONTROLLER
ARM-OUT
CN-128M
ARM-IN
PRESS SENSOR
52
čDF-3Ď
PRESS. SENSOR
ARM-IN
71
A
SIGNAL
PRESS SENSOR
SENSOR GND WIRE
54
B
GND WIRE
SENOSR 5V
56
C
5V
CAB
CHASSIS HARNESS
ZX215-1005119
7-74
Troubleshooting
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.
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Start the engine and keep it running
to perform troubleshooting.
Failure of
1
Levers in NEUTRAL, bucket-curl/dump pressure signals
0 KG
sensor
Pressure
Levers in operation, bucket-curl/dump pressure signals
0~39 KG
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Short circuit
Between harness (from controller pin 69 to CN-124M A)
2
of harness
and ground
Resistance
1M ȍ
(grounded)
Between harness (from controller pin 50 to CN-127M A)
and ground
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Open circuit
troubleshooting.
3
Between controller pin 54 and CN-124M B
of harness
Resistance
1 ȍ
Between controller pin 54 and CN-127M B
Defective
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
bucket
troubleshooting.
4
confluence
About 17.5
solenoid
Between CN-134F 1 and 2
Resistance
ȍ
valve
Failure of
No troubleshooting can be done due to internal failure. (Failure lies in the control-
5
controller
ler if the reasons above are ruled out)
7-75
Troubleshooting
BUCKET-DUMP
CN-127M
PRESS. SENSOR
čDF-3Ď
A
SIGNAL
GND WIRE
B
5V
C
CONTROLLER
BUCKET-CURL
CN-124M
BUCKET-CURL
PRESS. SENSOR
50
čDF-3Ď
PRESS. SENSOR
BUCKET-DUMP
SIGNAL
69
A
PRESS. SENSOR
GND WIRE
SENSOR GND WIRE
54
B
5V
SENOSR 5V
56
C
BUCKET
CONFLUENCE SIGNAL
99
CN-134F
BUCKET CONFLUENCE
čAMP-2Ď
PROPORTIONAL VALVE
SIGNAL
1
2
GND WIRE
CAB
CHASSIS HARNESS
ZX215-1005100
7-76
Troubleshooting
E-10 Travel speed or power is low
Trouble
Travel speed or power is low during operation.
Related information
Pilot pressure of travel operation can be checked on the monitor.
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting.
Failure of sen-
Levers in NEUTRAL, left and right travel pressure
1
0 KG
sor
signals
Pressure
Levers in operation, left and right travel pressure
0~39 KG
signals
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Short circuit
Between harness (from controller pin 49 to CN-
2
of harness
120M A) and ground
Resistance
1M ȍ
(grounded)
Between harness (from controller pin 67 to CN-
121M A) and ground
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Open circuit of
troubleshooting.
3
harness
Between controller pin 54 and CN-120M B Be-
Resistance
1 ȍ
tween controller pin 54 and CN-121M B
Failure of con-No troubleshooting can be done due to internal failure. (Failure lies in the con-
4
troller
troller if the reasons above are ruled out)
CN-121M
RIGHT TRAVEL
čDF-3Ď
PRESS. SENSOR
A
SIGNAL
GND WIRE
B
5V
C
CONTROLLER
RIGHT TRAVEL
CN-120M
LEFT TRAVEL
PRESS SENSOR
67
čDF-3Ď
PRESS. SENSOR
LEFT TRAVEL
49
A
SIGNAL
PRESS SENSOR
GND WIRE
54
B
SENSOR GND WIRE
5V
SENOSR 5V
56
C
CAB
CHASSIS HARNESS
ZX215-1005101
7-77
Troubleshooting
E-11 Blank monitor display
Trouble
Monitor display is blank after the machine is powered on.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
perform troubleshooting.
1
Failure of fuse
Between wire 22# and ground
About 24V
Voltage
Between wire 29# and ground
About 24V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Open circuit of
Between CN-7-705 pin 8 and CN-241F pin 3
1 ȍ
2
wire harness
Between CN-7-705 pin 9 and CN-241 pin 1
Resistance
1 ȍ
Between CN-7-705 pin 10# and ground
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Short circuit of
Between harness (from CN-7-705 pin 8 to CN-241
3
wire harness
1M ȍ
pin 3) and ground
Resistance
(grounded)
Between harness (from CN-7-705 pin 9 to CN-241
1M ȍ
pin 1) and ground
Failure of
No troubleshooting can be done for it is internal failure. (If it is not caused by
4
monitor
one of the factors listed above, it should be the failure of monitor.)
CN-1-112
(D-3)
CANH
11
120ȍ RESISTANCE
22
CANL
CN-7-705
CONTROLLER
(D-12)
CANH
3
3
3
CANL
4
4
4
29
8
CN-1-111
8
8
CANH
60
(D-6)
22
9
9
9
0
10
1
1
10
10
12
12
12
2
2
CANL
78
33
3
3
11
CN-241F
F1
20A
(D-12)
22
F10
5A
29
20
21
PWR PWR
CAB
CHASSIS HARNESS
ZX215-1005102
7-78
Troubleshooting
E-12 Monitor displays nothing
Display of monitor is illuminated but no information is
Trouble
shown on the screen after machine is powered on.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
Failure of resis-
perform troubleshooting.
1
tance
Between CN-1-112 1 and 2
Resistance
120 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
perform troubleshooting.
Open circuit of
2
Between CN-7-705 pin 3 and controller pin 60
1 ȍ
wire harness
Resistance
Between CN-7-705 pin 4 and controller pin 78
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
perform troubleshooting.
Short circuit of
Between harness (from CN-7-705 pin 3 to con-
3
wire harness
1M ȍ
troller pin 60) and ground
Resistance
(grounded)
Between harness (from CN-7-705 pin 4 to control-
1M ȍ
ler pin 78) and ground
Failure of monitor
No troubleshooting can be done for it is internal failure. (If it is not one of
4
or controller
the failures stated above, it should be the failure of monitor or controller.)
CN-1-112
(D-3)
CANH
11
120ȍ RESISTANCE
22
CANL
CN-7-705
(D-12)
CONTROLLER
CANH
3
3
3
CANL
4
4
4
CN-1-111
29
8
8
8
22
9
CANH
60
(D-6)
9
9
0
10
1
1
10
10
12
12
2
2
12
CANL
78
33
3
3
11
CN-241F
F1
20A
(D-12)
22
F10
5A
29
20
21
PWR PWR
CAB
CHASSIS HARNESS
ZX215-1005102
7-79
Troubleshooting
E-13 Dual speed travel not functioning
Trouble
Only low speed travel is functioning during operation.
Related information
Press the Hi/Lo button on the monitor to change travel speed.
Cause
Standard value in normal state/Remarks on troubleshooting
Failure of dual
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
1
speed travel
troubleshooting.
Between CN-131F A and B
Resistance
About 17.5 ȍ
solenoid valve
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Open circuit of
2
Between CN-132F pin A and controller pin 100
1 ȍ
wire harness
Resistance
Between CN-132F pin B and controller pin 55
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Short circuit of
troubleshooting.
3
wire harness
Between harness (from CN-132F pin A to con-
(grounded)
Resistance
1M ȍ
troller pin (100) and ground
4
CONTROLLER
CN-132F
HIGH SPEED TRAVEL
čAMP-2Ď
SOLENOID VALVE
HIGH SPEED TRAVEL
100
A
SIGNAL
SOLENOID VALVE
GROUND
55
B
GND WIRE
CAB
CHASSIS HARNESS
ZX215-1005104
7-80
Troubleshooting
E-14 Incorrect engine coolant reading
Engine coolant temperature sensor cannot correctly reflect cur-
Trouble
rent coolant temperature.
Related information
Coolant temperature can be checked on the monitor.
Cause
Standard value in normal state/Remarks on troubleshooting
Standard values for engine coolant temperature sensor
50°C
80 ȍ
Failure of coolant
60°C
56.3 ȍ
1
temperature sen-
80°C
29.5 ȍ
sor
100°C
16.5 ȍ
106°C
14.3 ȍ
120°C
10 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
Open circuit of
2
perform troubleshooting.
lead
Between wire 510# and controller pin 30
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
Short circuit of
3
perform troubleshooting.
lead (grounded)
Between wire 510# and ground
Resistance
1M ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to
Lead short to 24V
4
perform troubleshooting.
circuit
Wire 510# to ground
Voltage
1V
ࠊ఼
510
ދै⎆⏽ᑺӴᛳ఼
30
偒偊ᅸ
䔺䑿㒓 ᴳ
ZX215-1005105
7-81
Troubleshooting
E-15 Incorrect fuel level reading
Trouble
Engine fuel level sensor cannot correctly reflect current fuel level.
Related information
Fuel level can be checked on the monitor.
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Fuel level sen-
Pin
Fuel level
Resistance
1
sor error
Between wire 509# and ground
FULL (Upper limit)
Approx. 10 ȍ
EMPTY (Lower limit)
85-95 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Open circuit of
2
troubleshooting.
lead
Between wire 509# and controller pin 11
Resistance
1 ȍ
Short circuit of
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
3
lead (ground-
troubleshooting.
Between wire 509# and ground
Resistance
1M ȍ
ed)
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Lead short to
4
troubleshooting.
24V
Wire 509# grounded
Voltage
1V
CONTROLLER
FUEL LEVEL
509
11
SENSOR
CAB
CHASSIS HARNESS
ZX215-1005106
7-82
Troubleshooting
E-16 Wiper does not work
Trouble
Wiper does not work
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Internal Fail-
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
1
ure of wiper
troubleshooting.
Between wiper wire 25# and ground
Resistance
>10 ȍ
motor
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Open circuit of
Between CN-241F 1 and CN-1-110 (2)
1 ȍ
2
lead
Between wiper switch wire 35L# and CN-1-110 (5)
Resistance
1 ȍ
Between wiper switch wire 35L# and CN-1-110 (4)
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to perform
Short circuit of
troubleshooting.
3
lead (ground-
Harness from CN-241F 1 to CN-1-110 2 short to
Resistance
1M ȍ
ed)
ground
4
WIPER SWITCH
CN-121F
CN-132M
25
CN-1-110
čD-12Ď
čD-12Ď
CN-113F
čD-6Ď
čD-12Ď
1
1
36
36
F15 5A
2
2
11
35L
3
3
35L
M
25
25
4
3
3
35H
35H
4
4
4
4
CN-241M
5
5
čD-12Ď
1
21
PWR
CAB
ZX215-1005107
7-83
Troubleshooting
E-17 Incorrect arm-in pilot pressure reading
Trouble
Reading of arm-in pilot pressure is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-128M ① and ③
Voltage
Approx. 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-128M ② and controller pin 71
Resistance
ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
form troubleshooting.
3
signal wire
Between CN-128M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of sen-
4
perform troubleshooting.
sor
Between CN-128M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-128M
ARM IN
čDF-3Ď
PRESS SENSOR
ARM IN
71
2
SIGNAL
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005108
7-84
Troubleshooting
E-18 Incorrect arm-out pilot pressure reading
Trouble
Reading of arm-out pilot pressure is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-122M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-122M ② and controller pin 52
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-122M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of sen-
4
perform troubleshooting.
sor
Between CN-122M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-122M
ARM OUT
čDF-3Ď
PRESS SENSOR
ARM OUT
52
2
SIGNAL
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
5V
75
1
CAB
CHASSIS HARNESS
ZX215-1005109
7-85
Troubleshooting
E-19 Incorrect boom-raise pilot pressure reading
Trouble
Incorrect Boom-Raise Pilot Pressure Reading
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-126M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-126M ② and controller pin 70
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-126M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of sen-
4
perform troubleshooting.
sor
Between CN-126M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-126M
BOOM UP
PRESS SENSOR
čDF-3Ď
BOOM UP
70
2
SIGNAL
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005110
7-86
Troubleshooting
E-20 Incorrect boom-lower pilot pressure reading
Trouble
Boom-Lower pilot pressure reading is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-125M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-125M ② and controller pin 51
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-125M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of sen-
4
perform troubleshooting.
sor
Between CN-125M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-125M
BOOM DOWN
čDF-3Ď
PRESS SENSOR
BOOM DOWN
51
2
SIGNAL
PRESS SENSOR
55
3
GND WIRE
SENSOR GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005111
7-87
Troubleshooting
E-21 Incorrect bucket-curl pilot pressure reading
Trouble
Bucket-curl pilot pressure reading is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-124M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-124M ② and controller pin 69
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-124M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of sen-
4
perform troubleshooting.
sor
Between CN-124M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-124M
BUCKET CURL
čDF-3Ď
PRESS SENSOR
BUCKET CURL
SIGNAL
69
2
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005112
7-88
Troubleshooting
E-22 Incorrect bucket-dump pilot pressure reading
Trouble
Bucket-dump pilot pressure reading is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
Failure of 5V
1
perform troubleshooting.
power supply
Between CN-127M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-127M ② and controller pin 50
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-127M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position to
4
Failure of sensor
perform troubleshooting.
Between CN-127M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-127M
BUCKET DUMP
čDF-3Ď
PRESS SENSOR
BUCKET DUMP
SIGNAL
50
2
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005113
7-89
Troubleshooting
E-23 Incorrect swing pilot pressure reading
Trouble
Swing pilot pressure reading is incorrect.
Related information
Cause
Standard value in normal state/Remarks on troubleshooting
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position
Failure of 5V
1
to perform troubleshooting.
power supply
Between CN-123M ① and ③
Voltage
About 5V
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Open circuit of
2
form troubleshooting.
signal wire
Between CN-123M ② and controller pin 68
Resistance
1 ȍ
Ɣ Turn engine start switch to OFF position. Keep it at OFF position to per-
Short circuit of
3
form troubleshooting.
signal wire
Between CN-123M ② and ground
Resistance
2M ȍ
Ɣ Turn engine start switch to OFF position. Then, keep it at ON position
4
Failure of sensor
to perform troubleshooting.
Between CN-123M ② and ground
Voltage
0.5V~ 4.5V
5
CONTROLLER
CN-123M
SWING PILOT
čDF-3Ď
PRESS SENSOR
SWING PILOT
68
2
SIGNAL
PRESS SENSOR
SENSOR GND WIRE
55
3
GND WIRE
SENSOR 5V
75
1
5V
CAB
CHASSIS HARNESS
ZX215-1005114
7-90