Yamaha 5KR2, Service Manual

Page: 262 / 332

6-10
CARBURETOR
CARB
2
3
2
NOTE:
2. Check:
D
throttle position sensor
(removed from the carburetor)
a. Disconnect the throttle position sensor cou-
pler from the wire harness.
b. Remove the throttle position sensor from the
carburetor.
c. Connect the pocket tester (
Ω
1k) to the
throttle position sensor.
Positive tester probe blue terminal 1
Negative tester probe black terminal
d. Measure the maximum throttle position sen-
sor resistance.
Out of specification
Replace the throttle
position sensor.
Maximum throttle position
sensor resistance
4.0
X
6.0 k
Ω
at 20
_
C
(blue – black)
e. Connect the pocket tester (
Ω
1k) to the
throttle position sensor coupler.
Positive tester probe yellow terminal
Negative tester probe black terminal
f. While slowly opening the throttle, check that
the throttle position sensor resistance is with-
in the specified range.
The resistance does not change or it
changes abruptly
Replace the throttle
position sensor.
The slot is worn or broken
Replace the
throttle position sensor.
Check mainly that the resistance changes grad-
ually when turning the throttle, since the read-
ings (from closed to wide-open throttle) may dif-
fer slightly from those specified.
Throttle position sensor
resistance
0
X
5
±
1.0 k
Ω
at 20
_
C
(yellow – black)