2-109
2-109
501155
501155
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3.
3.48
48 Pa
Park
rkin
ing
g Br
Brak
ake
e Fa
Faul
ult
t (7
(75)
5)
Error code: 75
Error code: 75
Situation
Situation
Display: "75". All
Display: "75". All truck operations inhibited. Line contactor HOLD and ST contactor HOLD.
truck operations inhibited. Line contactor HOLD and ST contactor HOLD.
Traction moto
Traction motor and pump mo
r and pump motor operation
tor operation inhibited. If this fault o
inhibited. If this fault occurs before S
ccurs before ST contactor CLO
T contactor CLOSE, all
SE, all
operations inhibited except mast lowering operation.
operations inhibited except mast lowering operation.
Possible
Possible
cause
cause
Faulty parking brake coil, faulty main harness, faulty logic unit.
Faulty parking brake coil, faulty main harness, faulty logic unit.
Trigger of
Trigger of
the error
the error
code
code
By short circuit detection signal of
By short circuit detection signal of logic card.
logic card.
Checks
Checks
(1)
(1)
W
W
i
i
t
t
h
h
o
o
u
u
t
t
s
s
e
e
r
r
v
v
i
i
c
c
e
e
t
t
o
o
o
o
l
l
W
W
i
i
t
t
h
h
s
s
e
e
r
r
v
v
i
i
c
c
e
e
t
t
o
o
o
o
l
l
(3) Disconnect battery plug, then perform inverter discharging work
(3) Disconnect battery plug, then perform inverter discharging work
(4) Disc
(4) Disc
onnect connector E-04
onnect connector E-04
of logic unit (
of logic unit (
Check
Check
fault
fault
y valve
y valve
if f
if f
ound with service tool)
ound with service tool)
P
P
K
K
B
B
P
P
K
K
B
B
2
2
(2) Find P
(2) Find P
ark
ark
ing brake
ing brake
with input/
with input/
output m
output m
onitor
onitor
(5) Disc
(5) Disc
onnect connector E-04 of logic
onnect connector E-04 of logic
Unit
Unit
Disc
Disc
onnec
onnec
t connec
t connec
tor E-23 of
tor E-23 of
PK
PK
B
B
(7) C
(7) C
heck s
heck s
hort circuit between
hort circuit between
E-23-1(301) and
E-23-1(301) and
E-2
E-2
3-2(303)
3-2(303)
of harness sid
of harness sid
e
e
Not
Not
shorted
shorted
Shorted
Shorted
(6) D
(6) D
isconnect connec
isconnect connec
tor E-04of logic
tor E-04of logic
Unit
Unit
Disconnect connector of PKB
Disconnect connector of PKB
(10) Chec
(10) Chec
k short circ
k short circ
uit bet
uit bet
ween
ween
unload valve side
unload valve side
connectors
connectors
Measure coil resistance
Measure coil resistance
[13.5 Ω at -30 °C (-22 °F
[13.5 Ω at -30 °C (-22 °F
) to
) to
25.3 Ω at 80 °C (176 °F)]
25.3 Ω at 80 °C (176 °F)]
Shorted
Shorted
Not
Not
shorted
shorted
(8) Chec
(8) Chec
k short circ
k short circ
uit bet
uit bet
ween
ween
E-23-3(302) and
E-23-3(302) and
E-2
E-2
3-4(304)
3-4(304)
of harness sid
of harness sid
e
e
Shorted
Shorted
Not
Not
shorted
shorted
(11) Check short circuit between liftlock valve side
(11) Check short circuit between liftlock valve side
connectors
connectors
Measure coil resistance
Measure coil resistance
[13.5
[13.5
Ω at -30 °C (
Ω at -30 °C (
-22 °F) to
-22 °F) to
25.3 Ω at 80 °C
25.3 Ω at 80 °C
(176 °F)]
(176 °F)]
Normal
Abnormal
Normal
Abnormal
(9) Repair or replace main harness
(9) Repair or replace main harness
(
(
1
1
3
3
)
)
R
R
e
e
p
p
l
l
a
a
c
c
e
e
l
l
o
o
g
g
i
i
c
c
c
c
a
a
r
r
d
d
o
o
f
f
l
l
o
o
g
g
i
i
c
c
u
u
n
n
i
i
t
t
(
(
1
1
4
4
)
)
R
R
e
e
p
p
l
l
a
a
c
c
e
e
P
P
K
K
B
B
2
2
(12) Replace PKB 1
(12) Replace PKB 1
Summary of Contents for FB13PNT
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