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Signels to diegnostic unit
In this mode, the diagnostic
propriate,
which fault/acknowledgement
confirm
operation of
a
(The arrows
in
th
is
picture indicate that the
The
diagnostic circuit controls the
sistor, connecting
terminal 1
switch
and diagnostic
unit
produce
one
flash of the particular
transistor
opens
the terminal 1
ular fault
or acknowledgement code
If the
self-diagnostic
function
to be
the
initiated
when the
voltage at
II '
(Picture
0
)
circuit in the control unit
code is
switch.
direction
operation of
on
the
control unit
to
control unit
terminal 1
digiti.
Immediately after
ground connection and the cycle is repeated until
has been
has been
selected,
displayed.
The control unit receives this information
termi
nal
1
falls to
Design and function
t12V
A
I
D
reads the selected test function
to be displayed by the LED to report
of
signal
flow
is
the
transistor.
To produce a flash, the
to
ground
across terminal
and
to
ground across
this,
when the LED has been
completed.
the
d
iagnostic
zero as pushbutton
A is again depressed
Group 28 Ignition systems
System descriptions
0
0
5
program and
a
fault
stored in
from the
control
unit to the diagnostic unit.)
circuit activates
20. Current
then flows through the
terminal 20,
causing
the LED to light
extinguished
the three-digit
must be supplied w
ith
the form
of the new signal
.
determines,
as ap-
the
memory or
the
tran-
ignition
(i.e.
to
,
the signal
code
for the partic-
information on when
which
is
67
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