Checking The Injectors; Checking The Main Relay; Checking The Electric Fuel Pump - Yamaha F150A Service Manual

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Checking the injectors

1. Measure the resistance of the fuel injec-
tors. Replace if out of specification.
Digital circuit tester: 90890-03174
Fuel injector resistance
(use as reference):
14.0–15.0 Ω at 20 °C (68 °F)
NOTE:
Check the operation of the fuel injectors
using the "Stationary test" of the Yamaha
Diagnostic System.

Checking the main relay

1. Remove the fuse holder cover, and then
remove the fuse holder.
2. Connect the digital circuit tester leads to
the main relay terminals 1 and 2.
3. Connect the positive battery terminal to
the main relay terminal 1.
4. Connect the negative battery terminal to
the main relay terminal 3.
5. Check for continuity between the main
relay terminals. Replace if there is no
continuity.
6. Check that there is no continuity between
the relay terminals after disconnecting a
battery terminal from the main relay ter-
minals 1 and 3. Replace if there is con-
tinuity.
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Electrical systems
3

Checking the electric fuel pump

1. Turn the engine start switch to ON.
2. Listen for the operating sound of the
electric fuel pump 1. Check the fuel sys-
tem if there is no sound.
NOTE:
After the engine start switch is turned to ON,
the electric fuel pump will operate for 3 sec-
onds.
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S60V8450
63P3F11