Inspection

•Liftandsupportthefueltankwithitspropstay.(c:r4-52)

WTurntheignitionswitchOFF.

ChecktheECTsensorcouplerforlooseorpoorcontacts.

IfOK,thenmeasuretheECTsensorvoltageatthewiresidecoupler.

DisconnectthecouplerandturntheignitionswitchON.MeasurethevoltagebetweenBIBIwireterminalandground.

IfOK,thenmeasurethevoltagebetweenBIBIwiretermi•

nalandB/Brwireterminal.

BECTsensorvoltage:4.5-5.5V

(£1B/BI-8Ground)^((±)BIBI-c,B/Br

1Root109900-25008:Multicircuittester

^·r_m^.v-_'^vu_{Testerknobindication:Voltage(::-:)}

1-------'--N'-'o

rYes

.z.TurntheignitionswitchOFF.

LooseorpoorcontactsontheECMcoupler.

Openorshortcircuitinthe

BIBIwireorB/Brwire.

MeasuretheECTsensorresistance.

^{~ECTsensorresistance:2.3-2.6k.Qat20°C(68°F)}₂

(Terminal-Terminal)

1Rq109900-25008:Multicircuittester

^{!WTesterknobindication:Resistance(.Q)}

_{Refertopage5-8fordetails.}

_I-------^No_{_.}

ReplacetheECTsensor

'Yes

connection.(c:=::T4-25)

-withanewone.

_-

BIBIorB/Brwireopenorshortedtoground,orpoor~·or·~

IfwireandconnectionareOK,intermittenttroubleorfaultyECM.Recheckeachterminalandwireharnessforopencircuitand

EngineCoolant

_Temp.

Resistance

poorconnection.(c:r4-4)

~--~-ReplacetheECMwithanewone.andinspectitagain.

ECMcouplers

20°c(68°F)Approx.2.45k.Q

^{50°C(122°F)A}pprox.0.811kQ

80°C(176°F)Approx.0.318kQ

110°C(230°F)Approx.0.142kQ

"C21"IATSENSORCIRCUITMALFUNCTION

^{DETECTEDCONDITIONPO}SSIBLECAUSEHighintakeairtemp.(Lowvoltage-Low•Dgcircuitshortedtoground.

^{resistance)•B/Brcircuitopen.}

^{Lowintakeairtemp.(Highvoltage-High•}IATsensormalfunction.resistance)•ECMmalfunction.

INSPECTION

•Liftandsupportthefueltankwithitspropstay.(c::::T'4-52)

WTurntheignitionswitchOFF.

ChecktheIATsensorcouplerforlooseorpoorcontacts.

IfOK,thenmeasuretheIATsensorvoltageatthewiresidecoupler.

DisconnectthecouplerandturntheignitionswitchON.MeasurethevoltagebetweenDgwireterminalandground.

IfOK,thenmeasurethevoltagebetweenDgwiretermi•

nalandB/Brwireterminal.

~IATsensorvoltage:4.5-5.5V

(±)Dg-9Ground)^(@Dg-88/Br

_{1.:&lt09900-25008:Multicircuittester}

^{OWtTesterknobindication:Voltage(=)}

1-------N'-'--"-o--i_.L.ooseorpoorcontactsontheECMcoupler.

_{Openorshortcircuitinthe}

_,,Yes

OgwireorB/Brwire.

TurntheignitionswitchOFF.MeasuretheIATsensorresistance.

WJ1JIATsensorresistance:2.2-2.7kQat20°C(68°F)₂₍Terminal-Terminal)

irMI09900-25008:Multicircuittester

_{QW,jTesterknobindication:Resistance(Q)}

_TYes

No ReplacetheIATsensorwithanewone.

DgorB/Brwireopenorshortedtoground,orpoor'®'or~

connection.(c:::T4-25)

IfwireandconnectionareOK,intermittenttroubleorfaultyECM.Recheckeachterminalandwireharnessforopencircuitandpoorconnection.(c:::T4-4)

I ReplacetheECMwithanewone,andinspectitagain.

ECMcouplers

^{IntakeAirTemp.Res}istance

20°c(68°F)^{Approx.2.45kQ}

50°C(122°F)Approx.0.808kQ

80°C(176°F)Approx.0.322kQ

110°C(230°F)Approx.0.148kQ

NOTE:

/ATsensorresistancemeasurementmethodisthesamewayasthatoftheECTsensor.Refertopage5-8fordetails.

"C22"APSENSORCIRCUITMALFUNCTION

^{DETECTEDCONDITIONPOSSIBLE}CAUSE^{Lowpressureandlowvoltage.•}Cloggedairpassagewithdust.

)

^{Highpressureandhighvoltage.•}Redwirecircuitopenorshortedtoground.(0.5V~SensorVoltage<4.5V•B/BrorG/Ywirecircuitshortedtoground.

^{withouttheaboverange.•}APsensormalfunction.

NOTE:•ECMmalfunction.

Notethatatmosphericpressurevariesdependingonweatherconditionsaswellasaltitude.

Takethatintoconsiderationwheninspectingvoltage.

INSPECTION

•Removethefrontseat.(c::?6-6)

JJTurntheignitionswitchOFF.

ChecktheAPsensorcouplerforlooseorpoorcontacts.

IfOK,thenmeasuretheAPsensorinputvoltage.TurntheignitionswitchON.

DisconnecttheAPsensorcoupler.

MeasurethevoltagebetweenRedwireandground.

IfOK,thenmeasurethevoltagebetweenRedwireand

B/Brwire.

~APsensorinputvoltage:4.5-5.5V

(±)Red-8Ground)^((±)Red-88/Br

1RiOt109900-25008:Multicircuittester

^~_·m^r.v_>^u_"^v_{Testerknobindication:Voltage(::-:)}

_f--

_{No--Looseorpoorcontactson}

-----

TYes

_{gJConnecttheAPsensorcoupler.}

theECMcoupler.

Openorshortcircuitinthe

RedwireorB/Brwire.

Insertthecopperwirestotheleadwirecoupler.TurntheignitionswitchON.

-

MeasuretheAPsensoroutputvoltageatthewiresidecouplerbetweenG/YandB/Brwires.

6APsensoroutputvoltage:Approx.3.6V

at760mmHg(100kPa)

(@GN-8B/Br)

_{1r1iOL109900-25008:Multicircuittester}

^{=WTesterknobindication:Voltage(::-:)}

f-----_...;N...;,.o.".'--C1_hecktheairpassageforclogging.

Openorshortcircuitinthe

G/Ywire.

ReplacetheAPsensorwithanewone.

^TYes

WRemovetheAPsensor.

Connectthevacuumpumpgaugetotheairpassageport

oftheAPsensor.

Arrange3new1.5Vbatteriesinseries(checkthattotalvoltageis4.5-5.0V)andconnect8terminaltothegroundterminaland(?terminaltotheVeeterminal.

CheckthevoltagebetweenVoutandground.Also,checkifvoltagereduceswhenvacuumisappliedupto40cmHgbyusingvacuumpumpgauge.(Seetablebelow)

n'OOti09917-47010:Vacuumpumpgauge

09900-25008:Multicircuittester

_{~~Testerknobindication:Voltage(::-:)}

No

_Yes

^;::. Ifcheckresultisnotsatisfactory,replaceAPsensorwithanewone.

Red,G/YorB/Brwireopenorshortedtoground,orpoor@.@)

or®connection.(CT4-25)

IfwireandconnectionareOK,intermittenttroubleorfaultyECM.Recheckeachterminalandwireharnessforopencircuitandpoorconnection.(c:::74-4)

~--;;::.-ReplacetheECMwithanewone,andinspectitagain.

Outputvoltage(Veevoltage4.5-5.0V,ambienttemp.

20-30°C,68-86°F)

ECMcouplers

ALTITUDE(Reference)			ATMOSPHERICPRESSURE		OUTPUTVOLTAGE
(ft)		(m)	(mmHg)kPa		(V)
0		0	760100
I	I		I	I	3.1-3.6
2000	610		707	94
2001 I	611 I		707 I	94 I	2.8-3.4
5000	1524		634	85
5001 I	1525 I		634 I	85 I	2.6-3.1
8000	2438		567	76
8001	2439		567	76
I	I		I	I	2.4-2.9
10000	3048		526	70

"C23"TOSENSORCIRCUITMALFUNCTION

^{DETECTEDCONDITIONPO}SSIBLECAUSE

^{NoTOsensorsignalformorethan2seconds,•}TOsensorcircuitopenorshort.^{afterignitionswitchturnsON.•}TOsensormalfunction.

^{Sensorvoltagehigh.•}ECMmalfunction.(0.25V~SensorVoltage<4.85V)

withouttheaboverange.