Starting; Operation With Engine Idling - Fiat Bravo/Brava Workshop Manual

Engine
Fuel system
16v
Bravo- Brava ffi»
1999 update
10.
PMS PMS
97 65 10
ON /
I
A a
97 65 10
/
OFF |
A a
>
a
Aa:
ON
OFF
crankshaft flywheel square signals
fixed ignition advance (10° engine)
coil conduction activated
coil conduction deactivated
Starting
During starting, it is not possible to carry out
the normal management of the advance be­
cause the considerable fluctuations in the rota­
tion speed do not allow the dwell and advance
to be calculated correctly.
The advance is therefore managed taking the
following as a reference:
- for the start of conduction, the tooth at 65°;
- for the ignition advance, the tooth at 10°.
Consequently, 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 compared with the
map value is inversely proporational to the
temperature of the engine.
Operation in cut-off conditions
The ignition advance is increased on enty into cut-off conditions: from the moment the fuel supply is re-
enabled, the advance is gradually returned to the "basic" value.
A a '
- A R P M
\
X . +ARPM
Operation w i t h engine idling
When the engine is idling, the management of
the advance is implemented independently of
the "basic" advance.
The advance value whilst idling, which varies
according to the temperature of the coolant
(10° with the engine warm), is corrected ac­
cording to the variation in the speed in relation
to the pre-set speed, which also depends on
the temperature.
In particular, the advance is increased if the
speed decreases and is reduced if the speed
increases in order to guarantee the stability of
the actual speed.
Aa: ignition advance correction whilst
idling
+A RPM: the idle speed exceeds the nominal
value
-A RPM: the idle speed is below the nomi­
nal value
12
Print n° 506.670/20