Engine
Fuel system
16v
Marea- Marea Weekend
ft
99 update
PMS
PMS
97 6 5 10
a
ON /
9 7 6 5 10
OFF
r
a: crankshaft flywheel signals
Aa: fixed ignition advance (10° engine)
ON: coil conduction activated
OFF: coil conduction deactivated
Starting
During starting, the normal management of the
advance cannot be carried out because the
considerable fluctuations in the rotation speed
do not allow the dwell and the advance to be
calculated correctly.
The advance is therefore managed taking the
following references:
- for the start of conduction, the tooth at 65°;
- for the ignition advance, the tooth at 10°.
There is a fixed advance of 10° for the entire
time the engine is driven by the starter motor.
Operation when cold
Whilst the engine is running when cold, an
additional advance correction is implemented:
the increase in the advance in relation to the
value in the map is inversely proporational to
the temperature of the engine.
Operation in cut-off conditions
The ignition advance is increased on entry into cut-off: from the moment the supply of fuel is restored, the
advance is gradually returned to the "basic" value.
A a
- A RPM
+ A RPM
Operation with engine idling
When the engine is idling, the management of
the advance is implemented independently of
the "basic" advance.
The idle advance value, which varies according
to the temperature of the coolant (10° with the
engine warm) is corrected according to the
variation in the speed in relation to a pre-set
speed, also dependent on the temperature.
The advance is increased if the speed de-
creases and is reduced if the speed decreases
in order to guarantee the stability of the actual
speed.
4F011OJ02
Aa: correction of idle ignition advance
+A RPM: the idle speed is higher than the
nominal speed
-A RPM: the idle speed is below the nomi-
nal speed
12
Print n° 506.763/15
Содержание 1998 Marea Weekend
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