Ford Corsar Repair Manual page 263

E.C.C.S. SYSTEM DESCRIPTION
p q
Ignition Timing Control (Cont'd)
SYSTEM DESCRIPTION
e.g. N: 1,800 rpm, Tp: 1.50 msec
The ignition timing is controlled by the E.C.U. in
order to maintain the best air-fuel ratio in re-
sponse to every running condition of the engine.
The ignition timing data is stored in the ROM
located in the E.C.U., in the form of the map
shown below.
The E.C.U. detects information such as the injec-
tion pulse width and crank angle sensor signal
which varies every moment. Then responding to
this information, ignition signals are transmitted
to the power transistor
A "B.T.D.c.
In addition to this,
1 At starting
2 During warm-up
3
At idle
4
At
low
battery voltage
5 During swirl control valve operates
6
During hot engine operation
7 At acceleration
8 When intake air temperature is extremely
high
the ignition timing is revised by the E.C.U. accord-
ing to the other data stored in the ROM.
TP
(msec)
1.75
1.50
Injection
pulse
width
1.25
1.00.
0.75
A
A
T
600
1 , W
1,400 1.800 2.200
- N
Engine speed (rpm)
SEC7SOA