CSC RX3 - Electronic Fuel Injection Troubleshooting

CSCRX3ServiceManual
www.CSCMotorcycles.com
62
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Theinjectornozzleisstructurallyanelectromagneticswitch.TwopolesofcoilareconnectedtotheECU
withenginewiringharness,andthecoil,controlledbytheECU,willgeneratemagneticforceagains t
springforceafterbeingenergized;themagneticforcewilldisappear andtheinjectornozzlewillshut
downafter
thepowerbeingcutoff.
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Thetopendoffuelinjector,whichusesarubbersealring,along withthefuelrailconnectorforms
reliablepressurefuelseal;thelowerendusesarubbersealringaswell,anditformsanairsealalong
withtheengineinletpipe.
Theinjectornozzleinjectsfueltotheinletvalve.
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Thethrottlevalvebody,installedinfrontoftheinletpipe,consistsofthevalvebody,throttleplate
positionsensor,idlecontrolvalveetc.withamainfunctionofcontrollingtheairinputwhentheengine
isinworkingcondition.It
isthechannelfordialoguebetweentheelectroniccontrolsystemandthe
driver.
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Theoxygensensorisinstalledontheengineexhaustpipe,andisanimportantpartoftheclosedloop
fuelcontrolsystem.
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Themainsensitivematerialoftheoxygensensoriscobaltoxide.Itbecomesactiveafter
beingheatedby
exhaustgaswithatemperatureover300°C.Whenthisoccurs,oxygenionswillmovethroughthecobalt
oxidetoreachtheexternalelectrodes.Thecobaltoxidepartswillsensetheoxygencontentinthe
engineexhaust,changingitsoutputvoltagevalueaccordingly.
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TheoxygensensorusesTeflon‐insulated
wiresandpreformedelementsmadeofstainlesssteel.
Referenceairisinputthroughthesewires.Astheair‐fuelratiointheenginecombustorbecomes
thinner,theoxygencontentintheexhaustwillbecomehigherandtheoutputvoltageoftheoxygen
sensorwillbecomelower;conversely,theoutputvoltage
valuewillbecomehigher,thusgivingtheECU
feedbackabouttheengineair‐fuelratio.
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