Checking The Engine Temperature Sensor - Yamaha F200B Service Manual

ELEC
Checking the engine temperature
sensor
1. Remove the flywheel magnet cover.
2. Disconnect the engine temperature sen-
sor coupler a.
3. Turn the engine start switch to ON, and
then measure the input voltage at the
engine temperature sensor coupler.
PORT
B
B/Y
Engine temperature sensor input voltage:
Black/Yellow (B/Y)–Black (B)
4.75–5.25 V
4. Turn the engine start switch to OFF.
5. Remove the flywheel magnet. See
"Removing the flywheel magnet" (7-16).
6. Remove the engine temperature sensor.
7. Place the engine temperature sensor in a
container of water and heat the water
slowly.
8. Measure the engine temperature sensor
resistance at the specified temperatures.
5-59
Electrical system
a
Engine temperature sensor resistance
(reference data):
Black/Yellow (B/Y)–Black/Yellow (B/Y)
54.2–69.0 kΩ at 20 °C (68 °F)
3.12–3.48 kΩ at 100 °C (212 °F)
9. Install the engine temperature sensor,
and then tighten it to the specified torque.
Engine temperature sensor:
15 N·m (1.5 kgf·m, 11.1 ft·lb)
10. Remove the engine ECM cover.
11. Remove the engine ECM, and then dis-
connect the engine ECM coupler b.
b
12. Check the wiring harness for continuity.
b
a
2 1
Wiring harness continuity:
a Terminal 1–b Terminal 17
a Terminal 2–b Terminal 18
13. Connect the
NOTICE: Make sure that the rubber
seal is installed properly in the engine
ECM coupler.
14. Install the engine ECM, and then tighten
the engine ECM bolts to the specified
torque.
18 17
engine ECM coupler.