Checking The Speed Sensor (Optional) - Yamaha F225F Service Manual

Pressure pump a:
(commercially available)
Test harness (3 pins) b:
90890-06869
Water pressure sensor output voltage
(reference data):
Blue/Black (L/B)–Black (B)
2.5 V at 392.0 kPa
2
(3.92 kgf/cm , 56.8 psi)
4.5 V at 784.0 kPa
(7.84 kgf/cm 2 , 113.7 psi)
5. Turn the engine start switch to OFF, and
then disconnect the special service tool
b and pressure pump a.
6. Disconnect engine ECM couplers b and
c.
7. Check the wiring harness for continuity.
a
3 2 1
b
48
Wiring harness continuity:
Terminal 1–Terminal 79
Terminal 2–Terminal 77
Terminal 3–Terminal 48
Starter motor / 6Y9 Multifunction Color Gauge sensor
c
b
c
79 77
6Y9 Multifunction Color Gauge sensor
8. Install the water pressure sensor, and
then connect the water pressure sensor
coupler a.
9. Connect the engine ECM couplers b
and c.
Checking the speed sensor
(optional)
1. Disconnect the speed sensor coupler a.
2. Turn the engine start switch to ON, and
then measure the input voltage at the
speed sensor coupler.
Speed sensor input voltage:
Orange (O)–Black (B)
4.75–5.25 V
3. Remove the speed sensor, and then
connect the pressure pump a and
special service tool b.
4. Apply positive pressure to the speed
sensor slowly, and then measure the
output voltage at the specified pressures.
0
1
2
3
a
4
B O
5
6
7
8
9
10
A
5-64