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							SEQUENTIAL MULTIPORT FUEL INJECTION (SFI±V8)A1
CIRCUIT OPERATION1
CIRCUIT OPERATION
Sensors
Engine Fuel Temperature Sensor (X128)
This is a resistive sensor, located on the fuel rail and
measuring the temperature of the rail rather than the
fuel. The signal is used to increase the injection
pulse times when undergoing hot restarts. When the
fuel is hot, vaporisation occurs in the rail and a
ªbubbleº could form within the injectors. Increasing
the pulse times flushes the ªbubblesº away and cools
the fuel rail with fuel from the tank.
Knock Sensors (X309, X310)
The knock sensor is a ªPiezo±electric
accelerometer,º i.e. it produces an output voltage
proportional to mechanical vibration produced by the
engine. The Engine Control Module (ECM) (Z132)
receives the signal, filters out any noise and
calculates if the engine is knocking. Due to the cam
and crank signals supplying information regarding
the position of the engine in its cycle, the ECM
(Z132) can work out exactly which cylinder is
knocking and retards the ignition on that particular
cylinder until the knock disappears. It then advances
the ignition again to find the optimum ignition point
for that cylinder for those conditions (i.e. fuel type,
air temperature etc.). The ECM (Z132) will be able to
adjust cylinder timing for knock simultaneously, so
that all eight cylinders could have different advance
angles at the same time.
Coolant Temperature Sensor (X126)
A temperature dependant resistive metal component
is the major constituent of this sensor, i.e. the
resistance of the metal strip varies quite
considerably with temperature. The coolant sensor
signal is vital to correct engine operation, as the
injected fuel quantity is dependant upon the engine
temperature, i.e. richer mixture at low temperatures.
Intake Air Temperature Sensor (X311)
This is a resistive sensor, i.e. the change in
resistance is related to change in air temperature.
The signal from the Intake Air Temperature Sensor
(X311) is used to retard the ignition timing if the air
temperature rises above 55
C.
Crankshaft Position Sensor (X250)
The Crankshaft Position Sensor (X250) is a very
important sensor, as the signal it produces tells the
ECM (Z132) that the engine is turning, how fast it is
turning and at which stage the engine is at in thecycle. The crank signal is the basis of the fuel
injection and coil firing times.
Camshaft Position Sensor (Z262)
This is a Hall Effect sensor producing one pulse for
every two revolutions. The Signal is used in two
areas: Injector timing corrections for fully sequential
fuelling and active knock control.
Camshaft operation is essential to continue normal
ignition, i.e. actuate the fuel injectors in the normal
sequential order, timing the injection correctly with
respect to top dead centre. In this way the sequential
fuelling will either be correct, or one engine
revolution out of synchronisation.