Checking The Air Temperature Sensor - Yamaha F200B Service Manual

Wiring harness continuity:
a Terminal 1–b Terminal 15
a Terminal 2–b Terminal 16
10. Connect the engine
NOTICE: Make sure that the rubber
seal is installed properly in the engine
ECM coupler.
11. Install the engine ECM, and then tighten
the engine ECM bolts to the specified
torque.
Engine ECM bolt:
7 N·m (0.7 kgf·m, 5.2 ft·lb)
12. Install the engine ECM cover.
13. Connect the pulser coil coupler.
14. Install the flywheel magnet cover.

Checking the air temperature sensor

1. Measure the ambient temperature.
2. Connect the YDIS to display "Intake tem-
perature" (air temperature).
3. Check that the difference between the
ambient temperature and the displayed
intake temperature is within ± 5 °C (± 41
°F).
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. Remove the flywheel magnet cover.
5. Disconnect the air temperature sensor
coupler a.
6. Turn the engine start switch to ON, and
then measure the input voltage at the air
temperature sensor coupler.
ECM coupler.
Ignition unit and component
a
Air temperature sensor input voltage:
Black/Yellow (B/Y)–Black (B)
4.75–5.25 V
7. Turn the engine start switch to OFF.
8. Remove the air temperature sensor.
9. Place the air temperature sensor in a
container of water and heat the water
slowly.
10. Measure the air temperature sensor
resistance at the specified temperatures.
Air temperature sensor resistance
(reference data):
2.21–2.69 kΩ at 20 °C (68 °F)
0.32 kΩ at 80 °C (176 °F)
11. Install the air temperature sensor.
12. Remove the engine ECM cover.
13. Remove the engine ECM, and then dis-
connect the engine ECM coupler b.
B B/Y
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