Group
28
Ignition systems
Design and function
-
System descriptions
EZ-116K
2
1
4
following preliminary
steps
must be
carried out
to
ensure
LED displays
codes:
-
coding cable must be
connected
to
socket 6.
-
ignition must
be switched on
without
starting
the
engine (i.e.
the key must be turned to switch position II).
Pushbutton A must then
be
once or
for not longer than 3 seconds. One
the
diagnostic function and
operations the functional
program.
following fault
codes
are displayed when the
self-diagnostic
function
is selected:
1-1-1
No faults.
1-4-2
Internal
control
unit fault
;
engine runs with timing retarded to
'fail-safe' setting.
1-4-3
Faulty knock
sensor; engine
runs with timing retarded to
'fail-safe' setting.
1-4-4
No load
signal
from fuel
system control
unit.
2-1-4
Faulty
speed/position
pick
-
up
signal.
2-2-4
Faulty temperature sensor signal
(engine
runs as though hotl.
2-3-4
Faulty throttle
switch signal; engine
runs with timing retarded to
'fail-safe' setting.
Once a fault code has been displayed, the pushbutton must be operated again to display the next
code.
In this
case,
a
repeat of
previous code
indicates that
only one
fault is
stored
in the memory. The memory function must be
erased when any faults
present
have been
corrected. Since
the memory
accommodates
a maximum
of
three faults,
further
if
any,
cannot be displayed
until
the first three have been
corrected and
the memory
erased.
This is
car-
ried out as follows:
-
Switch
on
the ignition without
starting
the
engine
turn key to position II).
- Depress pushbutton A for
at
least
5 seconds.
- Wait for the LED to light
(approx.
4-5
secondsl.
-
Operate pushbutton A once more for at least 5 seconds.
Start
and
run the
engine
up to normal working temperature.
Stop
the
engine,
switch
on
the
ignition
and
operate
pushbutton A to
check
that no further faults are present in the memory. The LED
should
display the
code
1-1-1.
functional test program is selected by
operating
pushbutton A twice
after
the preliminary
steps
have been
car-
ried
out.
The LED will flash
continuously
at
a
frequency
of
approx. 6 flashes per
second,
indicating that the
control
unit is in the functional test mode. The following acknowledgement
codes
may then be displayed
:
3-3-4
Throttle switch
1-4-1
Speed/position pick-up
The acknowledgement
code indicating
that the throttle
switch and
its wiring/connections are
intact
is displayed by
pressing the
accelerator
to the floor. The
speed/position
pick-up
acknowledgement code
is then displayed
by
releas
-
ing the accelerator and starting the engine.
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