Checking The Air Pressure Sensor - Yamaha F225F Service Manual

ELEC
Air temperature sensor resistance
(reference data):
2.21–2.69 kΩ at 20 °C (68 °F)
0.32 kΩ at 80 °C (176 °F)
10. Disconnect the engine ECM coupler b.
11. Check the wiring harness for continuity.
a
2 1
Wiring harness continuity:
Terminal 1–Terminal 65
Terminal 2–Terminal 77
12. Connect the engine ECM coupler b.
13. Install the air temperature sensor, and
then connect the air temperature sensor
coupler a.

Checking the air pressure sensor

1. Remove the intake silencer.
2. Disconnect the air pressure sensor
coupler a.
3. Turn the engine start switch to ON, and
then measure the input voltage at the air
pressure sensor coupler.
5-49
Electrical system
b
b
65
77
a
Air pressure sensor input voltage:
Orange (O)–Black (B)
4.75–5.25 V
4. Turn the engine start switch to OFF.
5. Remove the air pressure sensor.
6. Connect the special service tools a and
b.
b
P/G
B
O
G/W G
b
Vacuum/pressure pump gauge set a:
90890-06756
Test harness (3 pins) b:
90890-06869
7. Turn the engine start switch to ON.
8. Apply negative pressure to the air
pressure sensor
measure the output voltage at the
specified pressure.
B O
a
B
slowly, and then