Yamaha XT660R Service Manual page 373

THROTTLE BODY ASSEMBLY
B/L Y L
1. Check:
• throttle position sensor
(removed from the throttle body)
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a. Disconnect the throttle position sensor cou-
pler from the throttle position sensor.
b. Remove the throttle position sensor from
the throttle body.
c. Connect the pocket tester (Ω × 1k) to the
throttle position sensor.
Positive tester probe → blue terminal 1
Negative tester probe →
d. Measure the maximum throttle position sen-
sor resistance.
Out of specification → Replace the throttle
position sensor.
Maximum throttle position sensor
resistance
4.0 ~ 6.0 kΩ at 20 °C (68 °F)
(blue — black/blue)
e. Connect the pocket tester (Ω × 1k) to the
throttle position sensor.
Positive tester probe →
Negative tester probe →
f. While slowly opening the throttle, check that
the throttle position sensor resistance is
within 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.
NOTE:
Check mainly that the resistance changes
gradually when turning the throttle, since the
readings (from closed to wide-open throttle)
may differ slightly from those specified.
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FI
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black/blue terminal 2
yellow terminal 3
black/blue terminal 2
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