Yamaha XF50W Service Manual page 277

THROTTLE BODY AND FUEL INJECTOR
EAS00916
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
Negative tester probe
terminal 2
Positive tester probe
Negative tester probe
©
Digital circuit tester
90890-03174
c. Measure the ISC (idle speed control) valve
resistance.
Out of specification
body.
a
ISC (idle speed control) valve resis-
tance
18 ~ 22
•••••••••••••••••••••••
7-34
FI ifl
-> pink terminal
-> green/yellow
-> gray terminal
-> sky blue terminal
-» Replace the throttle
at 20°C(68°F)
©
®