Ignitionsystem

ECM

Powersourcecircuit

Enginestopswitch

.,bs;d•·

_p#I-;')stand

^4relay

CKP

0 Sensor

Waveformarrangement

_circuit

Fuse

_?lIgnition

'--+-1

CPU

switch

_.

~-+-1Waveformarrangement

'---+-1circuit

Camposition

_sensor

_;Battery

^-

SecondaryThrottlethrottlepositioncontrolsensor

Enginecoolanttemp.

Gearpositionswitch

unit

^sensormm

NOTE:

Theignitioncut-offcircuitisincorporatedinthisECMtopreventover-runningofengine.Ifenginerpmreaches

14000r/min.,thiscircuitcutsofftheignitionprimarycurrentforallsparkplugs.

IACAUTIONI

Undernoload,theenginecanrunover14000r/min,eveniftheignitioncut-offcircuitiseffective,anditmaycauseenginedamage.Donotruntheenginewithoutloadover14000r/minatanytime.

TROUBLESHOOTING

Nosparkorpoorspark

_{Checktheignitionsystemcouplersfor}

*Checkthatthetransmissionisinneutralandtheenginestopswitchisinthe"RUN"position.Grasptheclutchlever.Checkthatthefuseisnotblownandthebatteryisfully-chargedbeforediagnosing.

_{poorconnections.}

~--Looseness----

•Poorconnectionofcouplers

_Correct

^t

Continuedonnextpage

Measurethebatteryvoltagebetweeninputleadwires(OM/andBM/)attheECMwiththeignitionswitchinthe"ON"position.

_Correct

^{1----Incorrect----•}Faultyignitionswitch

•Faultyturnsignal/side-standrelay

•Faultyenginestopswitch

_{•Brokenwireharnessorpoor}

^{'-----------------,}

_ir

_•

_I

_{Measuretheignitioncoilprimarypeak}

connectionofrelatedcircuitcouplers

voltage.(c::::T'7-19,-20)

NOTE:Thisinspectionmethodis

applicableonlywiththemulticircuittesterandthepeakvoltadaptor.

Correct

Inspectthesparkplugs.

(c::::T'2-5)

ICorrectIncorrect

_{lncor:t-~•Faultyspar:plug(-s)}

Inspecttheignitioncoil/plugcaps.(c:::?'7-20)

I

_Correct

ⁱ

Measurethecrankshaftpositionsensorpeakvoltageanditsresistance.

1----Incorrect----

•Poorconnectionoftheignitioncoil/plugcap(-s)

•Faultyignitioncoil/plugcap(-s)

...

(c::::T'7-21.-22)

NOTE:Thecrankshaftpositionsensorpeakvoltageinspectionisapplicableonlywiththemulticircuittesterandpeakvoltadaptor.

I

Correct

^{1----Incorrect----•}Faultycrankshaftpositionsensor

•FaultyECM

•Poorconnectionofignitioncouplers.

Inspection

IGNITIONCOILPRIMARYPEAKVOLTAGE

•Removetheaircleanerbox.(c::::T4-62)

•Disconnectalltheignitioncoil/plugcapleadwirecouplersbe•

foreremovingtheignitioncoil/plugcaps.

•Removealloftheignitioncoil/plugcaps.

IACAUTIONI

*Donotremovetheignitioncoil/plugcapbeforedis•connectingtheleadwirecoupler,ortheleadwirewillbedamaged.

*Donotpryuptheignitioncoil/plugcapwithascrew•

driverorabartoavoiddamage.

*Becarefulnottodroptheignitioncoil/plugcapasitmayopenorshortinacircuit.

•Connectthenewfoursparkplugstoeachignitioncoil/plugcap.Connectalltheignitioncoil/plugcapleadwirecouplerstotheignitioncoil/plugcapsrespectively,andgroundthemonthecylinderhead(eachsparkplughole).

IACAUTIONI

Avoidgroundingthesparkplugsandsupplingtheelec•tricalshocktothecylinderheadcover(magnesiumparts)topreventthemagnesiummaterialfromdamage.

NOTE:

Besurethatallcouplersandsparkplugsareconnectedproperlyandthebatteryusedisinfully-chargedcondition.

Inspecteachignitioncoilprimarypeakvoltageattheignitioncoil/

plugcapcoupler.

Connectthemulticircuittesterwithpeakvoltageadaptorasfollows.

No.1ignitioncoil/plugcap:

W/BIterminal((±)Probe)-Ground(8Probe)terminal

No.2ignitioncoil/plugcap:

Bterminal((±)Probe)-Ground(8Probe)terminal

No.3ignitioncoil/plugcap:

Yterminal((±)Probe)-Ground(8Probe)terminal

No.4ignitioncoil/plugcap:

Gterminal(€Probe)-Ground(8Probe)terminal

eJ09900-25008:Multicircuittesterset

IACAUTIONI

Beforeusingthemulticircuittesterandpeakvoltadap•

tor,besuretorefertotheappropriateinstructionmanual.

_<,

Contactto

thecylinderhead

NOTE:

,.Whenconnectingthemulticircuittester,insertthecopperwires(ODisbelow0.5mm)tothebacksideoftheignitioncoilleadwirecouplerandconnectthetesterprobestothem.

,.Usethecopperwire,itsouterdiameterbeingbelow0.5mm,topreventtherubberofthewaterproofcouplerfromdamage.

•Shiftthetransmissionintoneutralandturnignitionswitch"ON".

•Cranktheengineafewsecondswiththestartermotorbyde•pressingstarterbuttonandchecktheignitioncoilprimarypeakvoltage.

•Repeattheaboveinspectionafewtimesandmeasurethehigh•

estpeakvoltage.

:mJTesterknobindication:voltage(:-::)

~Ignitioncoilprimarypeakvoltage:Morethan80V

_AWARNING

Donottouchthetesterprobesandsparkplugstopre•