Yamaha YZF-R1 98 Service Manual page 261

CARBURETORS
2. Check:
• throttle position sensor
(rem oved from the carburetor)
a. Disconnect the throttle position sen-
sor coupler.
b. Rem ove the throttle position sensor
from the carburetor.
c. Connect the pocket tester (Ω × 1k) to
the throttle position sensor.
Tester positive probe → blue 1
Tester negative probe → black/ blue 2
d. M easure the throttle position sensor
m axim um resistance.
Out of specification → Replace the
throttle position sensor.
Throttle position sensor maxi-
mum resistance
4.0 ~ 6.0 kΩ at 20 ˚C
(blue — black/ blue)
e. Connect the pocket tester (Ω × 1k) to
the throttle position sensor coupler.
Tester positive probe → yellow 3
Tester negative probe → black/ blue 2
f. While slow ly opening the throttle,
check that the throttle position sensor
resistance is w ithin the specified
range.
The resistance does not change or it
changes abruptly → Replace the throttle
position sensor.
The slot is w orn or broken → Replace
the throttle position sensor.
NOTE:
Check m ainly
changes gradually w hen turning the
throttle, since the readings (from closed
to w ide-open throttle) m ay differ slightly
from those specified.
Throttle position sensor resis-
tance
0 ~ 5 ± 1.0 kΩ at 20 ˚C
(yellow — black/ blue)
6 - 13
CARB
that the resistance