Checking The High-Pressure Fuel Pump - Yamaha F150B Service Manual

ELEC
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
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."
a
High-pressure fuel pump input voltage:
Red/Yellow (R/Y)–Blue (L)
12.0 V (battery voltage)
5-25
Electrical system
L R/Y
4. Turn the engine start switch to "OFF."
5. Measure the resistance of the high-pres-
sure fuel pump motor.
High-pressure fuel pump resistance
(reference data):
0.5–10.0 Ω
6. Remove the junction box cover and the
main relay a, and then disconnect the
engine ECM coupler b.
b
a
7. Check the wiring harness for continuity.