Yamaha F150B Service Manual - Elec
5-25
ELEC
Electrical system
8.
Install the main relay a.
9.
Connect the engine ECM coupler b, and
then install the junction box cover.
10. Connect the fuel injector couplers a.
Checking the high-pressure fuel
pump
1.
Check the operation of the high-pressure
fuel pump using the “Stationary test” of
the YDIS and listen for the operating
sound.
2.
Disconnect the high-pressure fuel pump
coupler a.
3.
Connect the tester probes to the high-
pressure fuel pump coupler terminals,
and then measure the input voltage
within 3 seconds after turning the engine
start switch to “ON.”
4.
Turn the engine start switch to “OFF.”
5.
Measure the resistance of the high-pres-
sure fuel pump motor.
6.
Remove the junction box cover and the
main relay a, and then disconnect the
engine ECM coupler b.
7.
Check the wiring harness for continuity.
Wiring harness continuity:
Fuel injector #1
Terminal 1–Terminal c
Terminal 2–Terminal 40
Fuel injector #2
Terminal 1–Terminal c
Terminal 2–Terminal 39
Fuel injector #3
Terminal 1–Terminal c
Terminal 2–Terminal 41
Fuel injector #4
Terminal 1–Terminal c
Terminal 2–Terminal 17
High-pressure fuel pump input voltage:
Red/Yellow (R/Y)–Blue (L)
12.0 V (battery voltage)
a
R/Y
L
High-pressure fuel pump resistance
(reference data):
0.5–10.0
Ω
b
a