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FUEL SYSTEM
14-27
noid p r e v e n t i n g EGR and canister purge functions.
The exhaust gas oxygen content i n p u t i s n o t ac-
cepted b y the SBEC and i t w i l l adjust injector pulse
w i d t h t o supply a predetermined a m o u n t o f addi-
t i o n a l fuel.
Ignition Switch OFF Mode
T h i s i s a n O P E N L O O P mode. W h e n t h e i g n i t i o n
s w i t c h i s t u r n e d t o t h e O F F position, t h e SBEC
ceases t o provide a ground for t h e auto s h u t d o w n
(ASD) relay and extends t h e ISC actuator i n a n t i c i -
p a t i o n o f the next s t a r t up. W h e n the A S D r e l a y i s
not energized, battery voltage is shut o f f from t h e
fuel p u m p , fuel injector, i g n i t i o n coil, a n d oxygen
sensor h e a t i n g element. A l l fuel injection stops.
THROTTLE BODY
The t h r o t t l e body assembly
( F i g . 2 0 or 2 1 ) is
mounted o n top of the i n t a k e m a n i f o l d a n d contains
the fuel injectors, fuel pressure regulator, idle speed
control actuator, t h r o t t l e position sensor, and m a n i -
fold absolute pressure sensor. A i r flow t h r o u g h t h e
t h r o t t l e body i s controlled by t h e t h r o t t l e blade. The
t h r o t t l e blade is connected to t h e accelerator pedal b y
t h e accelerator cable. The fuel i n l e t and r e t u r n lines
are connected t o the t h r o t t l e body.
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