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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3. 3.46
46 Co
Cont ntac acto tor C
Error code: 72
Error code: 72
Situat
Sit
uation
ion
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)
(4) Chec
Check line contactor or
(5) Remove coil side terminals ofline contactor
(5) Remove coil side terminals ofline contactor
Disconnec
Disc
(7) Check
(7) Check
minus
minus
(10) Measure coil resistance
(10) Measure coil resistance
[44
[44
(12) Replace line contactor
(12) Replace line contactor
3
3
6
6
H-01(3W)
H-01(3W)
r Coi oil F l Fau
ault lt (7 (72) 2)
Displa
Dis
play: "7
y: "72".
2". All t
All truc
ruck ope
k operat
Faulty line contactor, faulty pump contactor, faulty main harness, faulty logic unit.
Faulty line contactor, faulty pump contactor, faulty main harness,
By short circuit detection signal of logic card.
By short circuit detection signal of
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
k line contactor or
Steering
Steering
contactor (Check
contactor (Check
Line contactor
Line contactor
onnect connector E-04
t connector E-04
of logic unit
of logic unit
short circuit between coil
short circuit between coil
termina
terminal plus(+)
(-)
(-)
of
of
harnes
harness
s
Not
Not
shorted
shorted
Shorted
Shorted
Ω at -30
Ω at -30
°C (-22
°C (-22
°F) to
°F) to
66
66
Ω at
Ω at 8
80 °C (1
Abnormal
Abnormal
Normal
Normal
R/Y
R/Y
4
4
27
27
Y/B
Y/B
5
5
21
21
B
B
6
6
23
23
R/Y
R/Y
3
3
27
27
Br
Br
2
2
22
22
B
B
23
23
1
1
2
2
1
1
1
1
2
2
3
3
5
5
4
4
4
4
5
5
6
6
E-38(4W)
E-38(4W)
ration
ions inh
s inhibi
ibited
ted. Li
. Line c
ne cont
ontact
actor O
logic card.
(2) Find faulty contactor (line contactor or steering
(2) Find faulty contactor (line contactor or steering
contac
contactor)
fault
fault
y contactor if found wit
y contactor if found
(6) Remove
(6) Remove c
Disconnec
Disc
l plus(+)
and
and
(8) Chec
(8)
Check short circuit between
minus(-) of
minus(-) of
(9) Repair or replace main harness
(9) Repair or replace main harness
(11) Measure coil resistance
(11) Measure coil resistance
0 °C
(176 °F
76
°F)]
)]
[61 Ω at -30 °C (-22 °F) to
[61 Ω at -30 °C (-22 °F) to
(13) Replace logic card of logic unit
(13) Replace logic card of logic unit
Tire
Tire
angle
angle
sensor
sensor
TWR
TWR
M
M
TVR
TVR
or OPEN
PEN and p
and pum
ump con
p contac
tactor
tor OPE
OPEN. N.
faulty logic unit.
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
tor)
with input
with input
/ output monitor
/output monitor
with serv
h
service tool
ice
tool)
)
Steering
St
eering
contactor
contact
or
coil side termina
oil side
terminals of
ls
ofsteering c
steering
onnect
t
connector E-04 of logic unit
conne
ctor E-04 of logic unit
k short circuit between
coil terminal
coil terminal
harness
harnes
s
Shorted
Shorted
Not shorted
Not shorted
91 Ω at
91 Ω at
Normal
Normal
Abnormal
Abnormal
(14)
(14) Rep
Replace Steer
lace
Steering
2
2
1
1
E-27
E-27
1
1
2
2
E-27
E-27
501145
501145
2-105
2-105
l
l
contactor
ontactor
plus(+
plus(+)
)
and
and
80 °C (176 °F)]
80 °C (176 °F)]
ing
contactor
contac
tor
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