Group
28
Ignition
sys
tems
Design and function - System descriptions
EZ-116K
EZ-116K end Rex-I - Oiegnostic system
The
EZ
-
116K1R
ex-
1
control
unit
(
1) incorporates
a
diagnostic
which
grea
tly
facilitates
fault
tracing and monitor-
ing of
the
system.
Th
e system
features two
separate
test functions
-
a
self-diagnostic
function whereby the diag
-
nost
ic
circuit continuously
m
o
nit
ors
the
operation
of
the ignition
system
,
and a
funct
io
nal test
program
which en-
ables the
operation of
certai
n
switches to be
tested
.
A diagn
ostic
unit
(2l,
mounted beside
the
left
-
hand suspension
strut
housing
i
n the
engine
com
partment
,
is used
t
o
communicate w
i
th
the diagnostic circuit in the
con
tro
l
unit
.
Oi8gnostic unit
The diagnostic unit
is
provided with a
coding
cable (
3), whi
c
h is used to
select
the
sys
t
em (ignition or
fuel injection)
to be tested
by inserting the plug in
th
e a
ppropri
a
t
e
socket
under
the
cover (4).
The
sockets are numbered
fr
om
1 to
7,
the ignition system being
te
sted
using
socket
No
.
6
.
The
pushbutton
(A) on
top
of
the unit
is
used to
selec
t
the
test function
.
Oispl8y codes
A
red
LED
(
B
)
i
s
loc
ated
on the
diagno
stic
unit beside the pushbutton
.
The LED d
i
splays a
se
r
ies
of flashing codes
to
indicate any faults wh
ich
may be present in the
system
when the appropriate test function ha
s
been act
iv
ated
.
The
code
i
s illustrated in Fig
.
C
above
.
As the illustrat
ion
shows,
the
code
consists of a
3-digit
number,
ea
c
h digit of
wh
ich is
indicated by flashing of the LED in rapid
succession (a
t
intervals
of
approx
.
0.5
seconds).
The interval be
-
tween
each series of
fla
shes
which
com
prises
an individual digit
is
approx. 2.5
seconds.
NOTE
:
Once the
self-diagnostic function
has
been selected
,
a fault code
w
ill
be displayed if
a
system
com
ponent
or its
wiring
is
faulty
.
On the other hand
,
when the functional test program
is
selected
,
the
LED will display a
code
confirming that the switch and wiring under test are fault
-
free
.
The
self-diagnostic
funct
io
n monitors the same
types of
fault
as
those
s
tored
in
the
con
tr
ol unit
memory
.
(The con
-
trol unit continuously monitors a number
of
the
components
and
circuits
co
nnected to
it,
detecting and
sto
r
ing
any
faults which
may occur.) The memory accommodates a total of
three
different faults, although the
LED
on
the
diag-
n
os
tic
unit can display up to
seven
3
-
digit fault
codes.
NOTE: The
memory
will
be erased and
the fault
codes
cancalled
if
the battery is
d
isco
nnectedl
63
