Checking The Throttle Body Sensor Assembly; Specifications - Yamaha YZF-R15 Service Manual

Coolant temperature sensor
18 Nm (1.8 m·kg, 13 ft·lb)
CHECKING THE THROTTLE BODY SENSOR
ASSEMBLY
WARNING
• Do not remove the throttle body sensor as-
sembly.
• Handle the throttle body sensor assembly
with special care.
• Never subject the throttle body sensor as-
sembly to strong shocks. If the throttle
body sensor assembly is dropped, replace
it.
Throttle position sensor
1. Check:
• Throttle position sensor
s s s s s s s s s s s s s s s s s s s s s s s s s s s s
a. Connect the digital circuit tester to the termi-
nals of the throttle body sensor assembly
coupler as shown.
• Positive tester probe →
blue terminal "1"
• Negative tester probe →
black/blue terminal "2"
b. Measure the throttle position sensor input
voltage.
Out of specification → Replace or repair the
wire harness.
Throttle position sensor input
voltage
5 V
(blue–black/blue)
c. Connect the pocket tester (DC 20 V) to the
terminals of the throttle body sensor assem-
bly coupler as shown.
• Positive tester probe →
yellow/blue terminal "3"
• Negative tester probe →
black/blue terminal "2"
ELECTRICAL COMPONENTS
d. While slowly opening the throttle, check that
the throttle position sensor output voltage is
increased.
Voltage does not change or it changes
abruptly → Replace the throttle body.
Out of specification (closed position) → Re-
place the throttle body.
Throttle position sensor output
voltage (closed position)
0.63–0.73 V
(yellow/blue–black/blue)
L/R
1 3
ssssssssssssssssssssssssssss
Intake air pressure sensor
1. Check:
• Intake air pressure sensor output voltage
Out of specification → Replace the throttle
body.
Intake air pressure sensor output
voltage
0.789–4.000 V at 20.00–101.32
kPa
s s s s s s s s s s s s s s s s s s s s s s s s s s s s
a. Connect the multimeter to the
sensor assembly coupler as shown.
Multimeter
• Positive tester probe →
pink/white "1"
• Negative tester probe →
black/blue "2"
8-72
2
throttle body