Service manual

ManualsBrandsYamaha ManualsScootersXF50W

THROTTLE BODY AND FUEL INJECTOR

EAS00916

FI ifl

CHECKING THE ISC (IDLE SPEED

CON-

TROL) VALVE

NOTE:

Do not remove the ISC (idle speed control) valve

unit completely from the throttle body assembly.

1.

Check:

8ISC (idle speed control) valve

•••••••••••••••••••••••

a. Disconnect the ISC (idle speed control)

valve coupler from the ISC (idle speed

con-

trol) valve.

b. Connect the digital circuit tester to the

ter-

minals of the ISC (idle speed control) valve.

Positive tester probe -> pink terminal ©

Negative tester probe -> green/yellow

terminal 2

Positive tester probe -> gray terminal ®

Negative tester probe -> sky blue terminal

©

Digital circuit tester

90890-03174

c. Measure the ISC (idle speed control) valve

resistance.

Out of specification -» Replace the throttle

body.

a

ISC (idle speed control) valve resis-

tance

18 ~ 22 at 20°C(68°F)

•••••••••••••••••••••••

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