Checking The Isc (Idle Speed Control) Valve - Yamaha 2004 YP400 Service Manual

THROTTLE BODY AND FUEL INJECTOR
Lg Sb
P Gy
1 3
2 4
EAS00916
CHECKING THE ISC (IDLE SPEED
CONTROL) VALVE
NOTE:
Do not remove the ISC (idle speed control)
valve unit completely from the throttle body
assembly.
1. Check:
• ISC (idle speed control) valve
M MMM M MMM M M MMM
a. Disconnect the ISC (idle speed control)
valve coupler from the ISC (idle speed con-
trol) valve.
b. Connect the pocket tester (Ω × 10) to the
terminals of the ISC (idle speed control)
valve.
Positive tester probe → pink terminal 1
Negative tester probe →
Positive tester probe → gray terminal 3
Negative tester probe →
Pocket tester
90890-03112, YU-03112-C
c. Measure the ISC (idle speed control) valve
resistance.
Out of specification → Replace the throttle
body.
ISC (idle speed control) valve
resistance
27 ~ 33 Ω at 20 °C (68 °F)
L LLL L LLL L L LLL
7 - 36
FI
M M MMM M M MMM M
light green terminal 2
sky blue terminal 4
L L LLL L L LLL L
M MMM M MMM
L LLL L LLL