2002 YAMAHA YZ250LC sensor

4-17
ENGCARBURETOR AND REED VALVE
2. Tighten:
9Screw (air cleaner joint) 1
9Screw (carburetor joint) 2
3. Connect:
9TPS (throttle position sensor) lead 1
9Solenoid valve lead 2
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
4. Adjust:
9Idle speed
Refer to “IDLE SPEED ADJUSTMENT”
section in the CHAPTER 3.
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4-17
CARBURATEUR ET SOUPAPE FLEXIBLE
VERGASER UND ZUNGENVENTIL
CARBURATORE E VALVOLA A LAMELLAENG
2. Serrer:
9Vis (raccord du filtre à air) 1
9Vis (raccord du carburateur ) 2
3. Connecter:
9Fil du TPS (capteur de position
du papillon) 1
9Fil d’électrovanne 2
Se reporter à la section “CHE-
MINEMENT DES CABLES”
du CHAPITRE 2.
4. Régler:
9Régime de ralenti
Se reporter à la section
“REGLAGE DU REGIME DE
RALENTI” du CHAPITRE 3.2. Festziehen:
9Schraube (Luftfilterverbindung)
1
9Schraube (Vergaserverbin-
dung) 2
3. Anschließen:
9TPS-Leitungskabel (Drossel-
stellungssensor) 1
9Magnetventilleitung 2
Siehe Abschnitt „KABEL-
FÜHRUNGSÜBERSICHT-
PLAN“ im KAPITEL 2.
4. Einstellen:
9Leerlaufdrehzahl
Siehe Abschnitt „EINSTEL-
LUNG DER LEERLAUFDREH-
ZAHL“ im KAPITEL 3.2. Serrare:
9Vite (giunto del filtro dell’aria)
1
9Vite (giunto del carburatore) 2
3. Collegare:
9Conduttore TPS (sensore di
posizione gas) 1
9Conduttore elettrovalvola 2
Consultare la sezione “DIA-
GRAMMA DEL PASSAGGIO
DEI CAVI” al CAPITOLO 2.
4. Regolare:
9Numero di giri al minimo
Consultare la sezione “REGO-
LAZIONE DEL NUMERO DI
GIRI AL MINIMO” al CAPI-
TOLO 3.
5NX-9-30-4A 6/5/01 4:12 PM Page 35

6-1
ELECTRICAL COMPONENTS AND WIRING DIAGRAMELEC
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1CDI unit
2“ENGINE STOP” button
3Ignition coil
4TPS (throttle position sensor)
5Solenoid valve
6CDI magneto
7Spark plug
EC612000
WIRING DIAGRAM
COLOR CODE
B...................Black
L ...................Blue
O ..................Orange
R ..................Red
Y...................Yellow
B/L................Black/Blue
B/R ...............Black/Red
B/W ..............Black/White
G/L ..............Green/Blue
G/W ..............Green/White
W/L...............White/Blue
W/R ..............White/Red
6
L
Y
B/LYL
B/LY LL
Y
B
B/W
B B/W
B
R
BB
RR
RR
R
B
B/R
G/L
G/W
W/R
W/L W/L B/R
G/L
W/R
B G/W G/L B/R W/L
G/W B W/R
O
B G/W G/L
Y B/L
L
W/R
W/L
B
R
B/R
B/W
O G/L
B/L
L
W/L
B
R
B/R
B/WG/W
Y
W/R
OB/L
5NX-9-30-6 6/5/01 4:44 PM Page 2

6-1
COMPOSANTS ELECTRIQUES ET SCHEMA DE CABLAGE
ELEKTRISCHE BAUTEILE UND SCHALTPLAN
COMPONENTI ELETTRICI E SCHEMA ELETTRICOELEC
ELEKTRISCHE
EINRICHTUNGEN
ELEKTRISCHE BAUTEILE
UND SCHALTPLAN
ELEKTRISCHE BAUTEILE1CDI-Einheit
2Motorstoppknopf „ENGINE STOP“
3Zündspule
4TPS (Drosselstellungssensor)
5Magnetventil
6CDI-Magnetzünder
7Zündkerze
FARBENKODIERUNGB...........Schwarz
L ...........Blau
O ..........Orange
R...........Rot
Y ...........Gelb
B/L ........Schwarz/Blau
B/R .......Schwarz/Rot
B/W ......Schwarz/Weiß
G/L .......Grün/Blau
G/W ......Grün/Weiß
W/L .......Weiß/Blau
W/B ......Weiß/Rot
SCHALTPLAN
PARTIE ELETRIQUE
COMPOSANTS
ELECTRIQUES ET
SCHEMA DE CABLAGE
COMPOSANTS ELECTRIQUES1Bloc CDI
2Bouton d’arrêt du moteur “ENGINE
STOP”
3Bobine d’allumage
4TPS (capteur de position du papillon)
5Electrovanne
6Magnéto CDI
7Bougie
CODE DE COULEURB ..........Noir
L ..........Bleu
O ..........Orange
R ..........Rouge
Y ..........Jaune
B/L ......Noir/Bleu
B/R ......Noir/Rouge
B/W ......Noir/Blanc
G/L ......Vert/Bleu
G/W ......Vert/Blanc
W/L ......Blanc/Bleu
W/R ......Blanc/Rouge
SCHEMA DE CABLAGE
IC600000
PARTE ELETTRICA
IC610000
COMPONENTI
ELETTRICI E SCHEMA
ELETTRICO
IC611000
COMPONENTI ELETTRICI1Unità CDI
2Pulsante “ARRESTO MOTORE”
3Bobina di accensione
4TPS (sensore di posizione gas)
5Elettrovalvola
6Magnete CDI
7Candela
CODICE CROMATICOB ..........Nero
L ..........Blu
O ..........Arancione
R ..........Rosso
Y ..........Giallo
B/L ......Nero/Blu
B/R ......Nero/Rosso
B/W ......Nero/Bianco
G/L ......Verde/Blu
G/W ......Verde/Bianco
W/L ......Bianco/Blu
W/R ......Bianco/Rosso
IC612000
SCHEMA ELETTRICO
6
5NX-9-30-6 6/5/01 4:44 PM Page 3

6-8
TPS (THROTTLE POSITION SENSOR) SYSTEMELEC
Check entire ignition
system for connection.Repair or replace.
OK
OKTPS coil
No goodReplace.Check TPS.
OKSource coil
No goodReplace.*Check CDI magneto.
TPS input
voltageNo goodReplace.Check CDI unit.
No good
EC690000
TPS (THROTTLE POSITION SENSOR) SYSTEM
EC691001
INSPECTION STEPS
If the TPS will not operate, use the following inspection steps.
*marked: Refer to “IGNITION SYSTEM” section.
NOTE:
9Remove the following parts before inspection.
1) Seat
2) Fuel tank
9Use the following special tools in this inspection.
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113Pocket tester:
YU-3112-C/90890-03112
5NX-9-30-6 6/5/01 4:44 PM Page 20

6-8
TPS-SYSTEM (TPS = DROSSELSTELLUNGSSENSOR)ELEC
TPS-Spule
Erneuern oder reparieren.Die Anschlüsse der gesamten
Zündanlage kontrollieren.Nicht in Ordnung
Nicht in OrdnungTPS kontrollieren.Erneuern.
Markierung * : Siehe Abschnitt „ZÜNDANLAGE“.
HINWEIS:
9Die folgenden Teile vor Beginn der Störungsbeseitigung ausbauen.
1) Sitz
2) Kraftstofftank
9Die folgenden Spezialwerkzeuge für die Störungsbeseitigung verwenden.
Induktivdrehzahlmesser:
YU-8036-B
Drehzahlmesser:
90890-03113Taschenprüfgerät:
YU-3112-C/90890-03112
In Ordnung
In Ordnung
Stromspule
Nicht in Ordnung*CDI-Magnetzünder kontrollieren.Erneuern.
In Ordnung
TPS-Eingangs-
spannung
Nicht in OrdnungCDI-Einheit kontrollieren.Erneuern.
TPS-SYSTEM (TPS = DROSSELSTELLUNGSSENSOR)
PRÜFVORGÄNGE
Falls das TPS nicht funktioniert, sind die folgenden Überprüfungen durchzuführen.
5NX-9-30-6 6/5/01 4:44 PM Page 22

6-8
SISTEMA TPS (SENSORE DI POSIZIONE
DELL’ACCELERATORE)
ELEC
Bobina del TPS
Ripararlo o sostituirlo.Controllare il collegamento dell’intero
sistema di accensione.
Non funziona
Non funziona
Non funziona
Non funzionaControllare il TPS.Sostituirla.
*contrassegnato:consultare la sezione “SISTEMA DI ACCENSIONE”.
NOTA:
9Prima dell’ispezione, togliere le parti che seguono.
1) Sella
2) Serbatoio del carburante
9In questa ispezione, usare i seguenti utensili speciali.
Contagiri induttivo:
YU-8036-B
Contagiri del motore:
90890-03113Tester tascabile:
YU-3112-C/90890-03112
OK
OK
Bobina primaria
*Controllare magnete CDI.Sostituirla.
OK
Tensione in
ingresso nel TPS
Controllare unità CDI.Sostituirla.
IC690000
SISTEMA TPS (SENSORE DI POSIZIONE DELL’ACCELERATORE)
IC691001
OPERAZIONI DI ISPEZIONE
Se il TPS non funziona, effettuare i seguenti controlli.
5NX-9-30-6 6/5/01 4:44 PM Page 23

6-9
TPS (THROTTLE POSITION SENSOR) SYSTEMELEC
L
Y
B1
21
2
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
9Couplers and leads connection
Rust/ Dust/ Looseness/Short-circuit 
Repair or replace.
EC692000
TPS COIL INSPECTION
1. Remove:
9Carburetor
9Mixing chamber top
Refer to “CARBURETOR AND REED
VALVE” section in the CHAPTER 4.
2. Inspect:
9TPS coil resistance
Out of specification Replace.
Tester (+) leadBluelead 1
Tester (–) lead
Blacklead 2
TPS coil Tester selector
resistance position
4~6kΩat
kΩ×1
20°C (68°F)
EC69A000
HANDLING NOTE
cC
Do not loosen the screws {TPS (throttle
position sensor)} except when changing
the TPS (throttle position sensor) due to
failure because it will cause a drop in
engine performance.
5NX-9-30-6 6/5/01 4:44 PM Page 24