ECU
The ECU consists of a CPU (Central Processing Unit),
a memory unit and I/O sections (input/output).
The signal of each individual sensor is sent to the input
section and then to the CPU. On the basis of the sig-
nals received, the ECU calculates the volume of fuel
and the ignition advance necessary by utilising pre-
pared schemes for the various conditions of the engine
and sending them respectively to the injectors and the
ignition coils.
SENSORS
ATMOSPHERIC AIR TEMPERATURE/PRESSURE
The suction air sensor (1) is situated on the right suc-
tion duct in the front part of the vehicle and indicates
both the atmospheric pressure and the air temperatu-
re.
1 INTAKE AIR PRESSURE SENSOR
The sensor (2) reveals the pressure of the intake air
and this pressure is therefore converted into voltage
that is sent to the ECU.
The signal involved has a double purpose, one
being that of phasing the injection and ignition of the
cylinders and the second being that of adjusting the
base fuel injection time (volume); this is in fact
determined depending on the tension of the signal
(output tension).
The voltage increases when the pressure of the
intake air is high.
- 8-
Air intake injection system
D
1
2
Output voltage
(V)
Pressure of the
intake air (mmHg)
High
High
Low
Low
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