Mazda 121 Workshop Manual page 165

OUTLINE
F
COMPONENT DESCRIPTIONS
Component
Rems]k
Air bypass solenoid
valve @
ilj€e1\otj
$oe'i
SLrpplies bypass air into intake manilold by
openrng bypass arr passage at either iollow ng
a) Ensine crankins
b) El€ctric load
c) P/S pressure switch ON
d) A,/C switch ON
e) Bange change lN-D)
f) Deceleralionconlrol
. Electrica load
a) cooling fan
b) Blower molor swltch
c) Headlighl switch
d) Rear window dehosler switch
Air bypass solenold
valve @
Supplies bypass air anlo lnlake manifod by
opening bypass air passage al eiiher lollowing
a) Engine cranking
b) P/S pressure swilch ON
c) Dece eralon conlrol
Air bypass solenoid
valve O
S'rpplies bypass air inlo nlake manifold by
opedng bypas arf passage with A/C swltch ON
Filiers air enleing injection body
Oil p€rmeated
Detects anrounl of inlake air; sends signal to
ECU
Uses Vref (5v) as power source
Batlle Drrects luel/ai. mixture into intake manilold
Cat.lytic convener
Reduce HC, CO and NOx by chem cal
Stores luel tank llmes whie engine stopped
Controls pressure ln iuel tank
Circuit opening retay
Vollage for {uel pump while enEne runnrnq
clutch $viich (MTx)
Delects clutch condlioni sends signal to ECU
Swilch OFF when cl'rlch pedal released
Crank angle sensor
Ne.signal
Detects crank angle at iaoo inlervalsi sends
signal to ECU
Diagnosls conneclor
Concentraled seMce connector Terminals:
1. EGI self.diagnostc lerminal
2. EC-AT self-diagnostc termifal
3. Inilia set lerminal
4. Fuel pLrmp check lerminal
5. Coollng ian ch€ck terminal
6. Engine rpm oulput telm nal
2l pin (located near leti strut toweo
Oashpor
Prevents alter burn when throtlle vaive closes
Ehglne conlrol unil
(ECU)
Conkols operal on ol the following.
a) Fuel injection conlrol system
b) Elecironic spafk advance (ESA) control
c) AJC cur-oti sysrem
d) Deceleralion conlrol syslem
e) Fuel p'rmp control system
D Evaporative emission conlrol syslem
g) Falsale conkol system
h) Secondary air injeclion system
Fuel lllie. Filters panicles lrom luel
Fuel pump
Provrdes lLiel to nleclor
Operates whale engine runn ng
Supply only evaporative emission into charcoa
can sler lo prevent charcoai canisler from lue
F-9