Checking The Air Temperature Sensor - Yamaha F225F Service Manual

7. Check the wiring harness for continuity.
a
2 1
b
29
Wiring harness continuity:
Terminal 1–Terminal 29
Terminal 2–Terminal 84
8. Connect the engine ECM couplers b
and c.
9. Connect the pulser coil coupler a.

Checking the air temperature sensor

1. Measure the ambient temperature.
2. Connect the YDIS to display "Intake
temperature" (air temperature).
3. Check that the difference between the
ambient temperature and the displayed
intake temperature is within ± 5 °C
(± 41 °F).
c
b
c
84
Ignition unit and component
TIP:
• Check the air temperature sensor when the
engine is cold.
• When checking the air temperature sensor,
remove the top cowling and do not start the
engine.
4. Disconnect the air temperature sensor
coupler a.
5. Turn the engine start switch to ON, and
then measure the input voltage at the air
temperature sensor coupler.
a
Air temperature sensor input voltage:
Black/Yellow (B/Y)–Black (B)
4.75–5.25 V
6. Turn the engine start switch to OFF.
7. Remove the air temperature sensor.
8. Place the air temperature sensor in a
container of water and heat the water
slowly.
9. Measure the air temperature sensor
resistance at the
temperatures.
0
1
2
3
B B/Y
4
5
6
7
8
9
10
specified water
A
5-48