Mazda 121 Workshop Manual page 166

F
OUTLINE
Componsnt
Remart
lghlllon swilch
(STABT posilion)
Engine cranking signal sent 1o ECU
lnhlbllor swilch
(ATX)
Detects in-gear conditioni sends signal to ECU
S w i c h O N n N o r P r a n g e s
Inleclion body
a) lniects iuel into inlake manilold
b) Adiusls inlake alr amounl by throttle valve
ct ldl;-up by air bypass solenoid vave @
d) Detecls amount ol intakes alr by airl ow
Conssts ol throtlle vaive dashpot, throtlle sen'
sor, last idle cam, airflow sensor, inieclor, pres'
sure fegulator, and ar bypass solenod valve
@
Ini6ctor
lniecrs fue in relatlon to englne needs
Conrrolled by signals lfom ECU
High-ohmic lnjector
Installed on injecton body
Main relay
(FUEL INJ relay)
Supplies electric currenl to injector, ECU, elc
t{eurral swnch (t TD
Detects in-gear condiLon; sends signal to ECU
Switch ON in neulral
Orygen sensoa
Deiects oxygen concenlrationi sends signallo
ECU
Zrrconia cetamic and platrnum coatng
Contros blowby gas Introduced Inlo engine
P/S pressure 3witch
Derecrs P/S operatoni sends signal lo ECU
P/Sr ON when sleeing wheel lum€d
Prelsure regulrtor
Adjusts Jue pressure supplied to injector
Specd s€nsor
Detects speed: sends signal to ECU
Insialled on instrumenl cluster
stopllglrr swllch
Delects braking operalion (deceleranon)i sends
signal to ECU
Solenoid valve
(purg. conltoD
Conlrols evaporative lumes from canister 10 in_
Throltle sercof
Deiects lhrottle valve op€nlng anglel sends sg_
nal to ECU
Installed on injecuon body
Wat.r thetmos€nsor
Delects coolant temperature; sends signal to
ECU
lnsraled on iniake manlfo d
F - l 0