Yamaha 5KR2, Service Manual

Page: 261 / 332

6-9
CARBURETOR
CARB
NOTE:
NOTE:
EAS00502
CHECKING AND ADJUSTING THE
THROTTLE POSITION SENSOR
Before adjusting the throttle position sensor, the
engine idling speed should be properly ad-
justed.
1. Check:
D
throttle position sensor
(installed on the carburetor)
a. Disconnect the throttle position sensor cou-
pler from the wire harness.
b. Connect the pocket tester (
Ω
1k) to the
throttle position sensor coupler.
Positive tester probe blue terminal 1
Negative tester probe black terminal 2
c. 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)
d. Connect the pocket tester (
Ω
1k) to the
throttle position sensor.
Positive tester probe yellow terminal 3
Negative tester probe black terminal 2
e. While slowly opening the throttle, check that
the throttle position sensor resistance is with-
in the specified range.
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.
Out of specification or the resistance
changes abruptly
Go to step 2 below.
Throttle position sensor
resistance
(520
X
900
Ω
)
X
(4.0
X
6.0 k
Ω
)
at 20
_
C
(yellow – black)