Group
28
Ignition systems
Design
and function
-
System descriptions
23
I
•
A
B
EZ-118K
EZ-1 18K
-Idling compensation
EZ-118K may be
provided
with
one or
two
idling compensa
t
ion
funct
i
ons ifthe car is equipped
with automatic trans-
mission and/or
air conditioning.
ei
t
her
function is activated, [he
control
unit will advance the timing at
i
d
ling
by
to
compensate
for the higher engine load.
A
.
Certain models equipped with automatic transmission are provided with a function which advances
the timing
when a
posi
t
ion
is
selec
ted
,
to
compensa
t
e
for
th
e
increased load
imposed
by
the torque
converte
r
.
Th
e s
tarting
interlock switch
(2
1)
opens
the
relay
coi
l
(22) ground
connec
tion when the
gear selec
t
or is
moved
t
o
position R. D, 2 or 1. This
closes
the relay contacts,
supp
ly
ing
12
V
t
o
the
timing advance
terminal
on the control
unit
(1)
.
The
con
tr
ol
unit will advance the
t
iming if
the
idling (air con
trol)
switch
(
19)
also indicates
that the
engine
is
idling
.
B
. Certain
models
equipped
with air
conditioning
are provided with
a
function which advances the
tim
ing
when
the
AC
compressor is switched in
,
thereby
preven
t
ing
a fall
in
idling
speed
while maintaining the
capacity
of
the
AC
system
.
The timing
advance
terminal
on
the
control unit
(1)
is connected
to the electromagnetic
clutch circuit on
the
com-
pressor
(23)
,
and receives a
12
V supply
when the pressure
switch
1
24
}
closes
to energize the
clutch
.
The
control unit
then advances the timing
if
the
id
l
ing sw
i
tch
also
indicates
that the
engine is idling
.
On the B
230
K
eng
i
ne
,
the
above compensat
i
on
functions
i
ntervene
on
l
y if
the engine temperature exceeds 75
"
C
on
variants or 85
"
C on
1987
and later variants
.
..
Idl
i
ng
c
ompensat
i
on operated bv the
i
gn
i
ti
o
n system
c
ontrol un
i
t
i
s not required on engines on which
the
i
dl
i
ng
valve is
to
the
fuel
system
c
ontr
o
l un
i
t
(
C
I
S system
)
or
to
a special C
I
S control un
i
t
.
On engines
of this
type
.
the
CIS valve
ensures that
a
i
r
,
85
well
as add
i
t
i
ona
l
l
u
e
l,
is
s
uppl
i
ed
to the
eng
i
ne
to
c
ompen
s
ate for
the
in
c
reased load
.
52
