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