Checking The Fuel Injector - Yamaha F150B Service Manual

8. Connect the engine ECM coupler e, and
then install junction box cover.
9. Install the filter cup assembly. See "Fuel
filter" (6-13).
10. Connect the water detection switch cou-
pler a.

Checking the fuel injector

1. Check the operation of the fuel injectors
using the "Stationary test" of the YDIS
and listen for the operating sound.
2. Disconnect the fuel injector couplers a.
3. Turn the engine start switch to "ON," and
then measure the input voltage between
the fuel injector coupler terminal and
ground.
a
Fuel injector input voltage:
Red/Yellow (R/Y)–Ground
12.0 V (battery voltage)
4. Turn the engine start switch to "OFF."
5. Measure the fuel injector resistance.
Fuel control units and components
Fuel injector resistance (reference data):
14.0–15.0 Ω at 20 °C (68 °F)
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.
b
41
R/Y
a
b
a
17
40
39
0
1
2
3
4
5
6
7
8
c
9
10
A
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