CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
Cha
Chapte
pter 2
r 2 TRO
TROUBL
UBLESH
ESHOOT
OOTING
ING FOR
FOR CON
CONTRO
TROL C
L CIRC
IRCUIT
UITS
S
1
1..
G
Ge
en
ne
erra
al In
l Inffor
orm
ma
attiio
on
n
1.
1.1
1
B
Bef
efor
ore r
e rep
epllac
aciing
ng d
dev
evic
ice
ess
1.
1.2
2
Co
Conn
nnec
ecti
tion
on of
of th
the
e se
serv
rvic
ice
e to
tool
ol
Do not replace devices casually even if replacement is required as a result of troubleshooting. Be sure to check the following
Do not replace devices casually even if replacement is required as a result of troubleshooting. Be sure to check the following
items before replacing devices (logic unit, logic card, power supply card, inverters, inverter DSP cards, EPS, input unit and
items before replacing devices (logic unit, logic card, power supply card, inverters, inverter DSP cards, EPS, input unit and
output unit).
output unit).
--
Lo
Loos
ose
e ba
batt
tter
ery
y co
conn
nnec
ecto
tors
rs
--
Ab
Abno
norm
rmal
al wi
wire
re ha
harn
rnes
ess c
s con
onne
nect
ctio
ions
ns
--
LLo
oo
osse c
e co
on
nn
ne
ecctto
orrss
--
Br
Brok
oken
en, b
, ben
ent o
t or l
r loo
oose
se co
conn
nnec
ecto
tor p
r pin
inss
--
D
Diirrtty c
y co
on
nn
ne
ecctto
orrss
If connectors are dirty, remove the connector and clean connectors.
If connectors are dirty, remove the connector and clean connectors.
See "How to clean harness connectors and system components" on page 2-2.
See "How to clean harness connectors and system components" on page 2-2.
--
Ensur
Ensure that t
e that the main ha
he main harness i
rness is not sho
s not short-ci
rt-circui
rcuited to t
ted to the tru
he truck body b
ck body by using t
y using the follo
he following pr
wing proced
ocedures
ures..
502882
502882
(1) Disc
(1) Disc
onnect batt
onnect batt
ery plug and disc
ery plug and disc
harge the inverters
harge the inverters
and EPS
and EPS
before
before
working on electrical system
working on electrical system
(2) Disc
(2) Disc
onnect connector E-01
onnect connector E-01
of logic unit.
of logic unit.
Check c
Check c
ontinui
ontinui
ty between
ty between
E-01-15(106) and truck body (logic unit installation bolts, etc.)
E-01-15(106) and truck body (logic unit installation bolts, etc.)
No
No
continuity
continuity
Continuity
Continuity
(
(
3
3
)
)
N
N
o
o
r
r
m
m
a
a
l
l
(
(
4
4
)
)
R
R
e
e
p
p
a
a
i
i
r
r
o
o
r
r
r
r
e
e
p
p
l
l
a
a
c
c
e
e
h
h
a
a
r
r
n
n
e
e
s
s
s
s
If any of these items (above items) is a source of the trouble, the device will be damaged even if it
If any of these items (above items) is a source of the trouble, the device will be damaged even if it is replaced with a new one.
is replaced with a new one.
Be sure to check the
Be sure to check the above items and replace carefully.
above items and replace carefully.
(1)
(1) Tur
Turn of
n off th
f the tr
e truck
uck pow
power
er..
(2
(2)) Re
Remo
move c
ve cup ho
up hold
lder
er..
(3)
(3) Find t
Find the con
he connect
nector E-0
or E-09 to th
9 to the ser
e service t
vice tool.
ool.
(4)
(4) Remo
Remove the
ve the cove
cover and c
r and conne
onnect the
ct the PC as sh
PC as shown.
own.
(5)
(5) Tur
Turn on
n on the
the tru
truck p
ck powe
ower.
r.
(6)
(6) Star
Start th
t the se
e servic
rvice t
e tool
ool softw
software.
are.
1
1
2
2
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