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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3. 3.54
54 Lo
Load
Error code: 81
Error code: 81
Situation
Situation
Possible
Possible
cause
cause
Trigger of
Trigger of
the error
the error
code
code
Checks
Checks
(1) Disconnect battery plug
(1) Disconnect battery plug
(2) Disconnect cable of logic and load weight sensor
(2) Disconnect cable of logic and load weight sensor
Check continuity between E-02-24
Chec
Check continuity between E-02-23
Chec
Check continuity between E-03-28
Chec
(3) Disconnect connecter E-01
(3) Disconnect connecter E-01
Chec
Check continuity betw
(4) Connect logic connector E-02 and E-03 and connect
(4) Connect logic connector E-02 and E-03 and connect
battery plug
battery plug
Turn on power
Turn on power
Check
Check
E-20-1(GND)
E-20-1(GND)
(6) Turn off power, turn off battery and discharge
(6) Turn off power, turn off battery and discharge
Replace load weight sensor
Replace load weight sensor
(8) Reinstall the load weight sensor just has been replaced
(8) Reinstall the load weight sensor just has been replaced
and replace logic card of logic unit
and replace logic card of logic unit
Power card
Power card
ad Se
Sens
nsor or Fa
Faul ult t (8 (81) 1)
Pitch control and tilt mechanism to secure horizontal operation are disabled.
Pitch control and tilt mechanism to secure horizontal operation are disabled.
All other operations are available.
All other operations are available.
Load weight sensor fault, harness fault, logic unit
Load weight sensor fault, harness fault, logic unit fault
Load weight sensoris more than 4.9 V, or less than 01 V.
Load weight sensoris more than 4.9 V, or less than 01 V.
k continuity between E-02-24
and
and E-20-
k continuity between E-02-23
and
and E-20-
k continuity between E-03-28
and
and E-20-
Continuity
Continuity
No
No
continuity
continuity
k continuity
between E
een
E-02-04
-02-04
and
and
N
N
o
o
r
r
m
m
a
a
l
l
A
A
b
b
voltage between
voltage between
E-20-3(Power)
E-20-3(Power)
5
5
V
V
±
±
10
10
%
%
Outside
Out
side
acce
accepta
If fault remains
If fault remains
fault
E-20-3(55)
3(55)
E-20-1(54)
1(54)
E-20-2(56)
2(56)
E-01-09
E-0
1-09
n
n
o
o
r
r
m
m
a
a
l
l
(5) Replace harness
(5) Replace harness
and
and
ptable
ble
range
range
(7) Replace logic card of logic unit
(7) Replace logic card of logic unit
501157
501157
2-121
2-121
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