Checking The High-Pressure Fuel Pump; Checking The Vapor Shut-Off Valve - Yamaha F150A Service Manual

Fuel injector resistance (reference data):
11.50–12.50 Ω at 20 °C (68 °F)
6. Connect the fuel injector couplers.
Checking the high-pressure fuel
pump
1. Check the operation of the high-pressure
fuel pump using the YDIS "Stationary
test" and check the operating sound.
2. Disconnect the high-pressure fuel pump
coupler "a".
3. Connect the tester probes to the termi-
nals of the high-pressure fuel pump cou-
pler, and then measure the input voltage
within 3 seconds after turning the engine
start switch to ON.
a
High-pressure fuel pump input voltage:
Red/Yellow (R/Y)–Blue (L)
12 V (battery voltage)
4. Turn the engine start switch to OFF.
5. Measure the high-pressure fuel pump
motor resistance.
6. Connect the high-pressure fuel pump

Checking the vapor shut-off valve

1. Disconnect the vapor shut-off valve cou-
2. Turn the engine start switch to ON, and
L R/Y
3. Remove the vapor shut-off valve, and
4. Apply the specified negative pressure to
5-18
Fuel control unit and component
High-pressure fuel pump resistance
(reference data):
0.5–10.0 Ω
coupler.
pler "a".
then measure the input voltage between
the vapor shut-off valve coupler terminal
and ground.
a
Vapor shut-off valve input voltage:
Red/Yellow (R/Y)–Ground
12 V (battery voltage)
then connect the special service tool "1"
to the vapor shut-off valve.
Vacuum/pressure pump gauge set "1":
90890-06945
the vapor shut-off valve.
Specified negative pressure:
67.0 kPa (0.67 kgf/cm
R/Y
2
, 9.7 psi)
0
1
2
3
4
5
6
7
8
9
10
A