Checking The Low-Pressure Fuel Pump And High-Pressure Fuel Pump - Yamaha F225F Service Manual

ELEC
Wiring harness continuity:
Injector #1
Terminal 1–Terminal 18
Terminal 2–Terminal 87
Injector #2
Terminal 1–Terminal 18
Terminal 2–Terminal 88
Injector #3
Terminal 1–Terminal 18
Terminal 2–Terminal 96
Injector #4
Terminal 1–Terminal 18
Terminal 2–Terminal 97
Injector #5
Terminal 1–Terminal 18
Terminal 2–Terminal 114
Injector #6
Terminal 1–Terminal 18
Terminal 2–Terminal 104
10. Connect the fuse holder coupler b, and
then install the fuse holder a.
11. Install the intake manifold (STBD). See
"Installing the intake manifold" (6-16).
12. Connect the engine ECM coupler c.
13. Connect the fuel injector couplers a.
Checking the low-pressure fuel
pump and high-pressure fuel pump
1. Check the operation of the low-pressure
fuel pump and high-pressure fuel pump
using the YDIS "Stationary test" and
check the operating sound.
2. Disconnect the low-pressure fuel pump
coupler a.
3. Turn the engine start switch to ON, and
then measure the input voltage between
the low-pressure fuel pump coupler
terminal and ground.
5-37
Electrical system
R/Y
Low-pressure fuel pump input voltage:
Red/Yellow (R/Y)–Ground
12.0 V (battery voltage)
4. Turn the engine start switch to OFF.
5. Disconnect the high-pressure fuel pump
coupler b.
6. Connect the tester
terminals of the high-pressure fuel pump
coupler b, and then measure the input
voltage within 5 seconds after turning the
engine start switch to ON.
B R/Y
High-pressure fuel pump input voltage:
Red/Yellow (R/Y)–Black (B)
12.0 V (battery voltage)
7. Measure the resistance of the fuel pump
motors.
a
probes to the
b