Yamaha F225F, Service Manual

Page: 186 / 576

5-23
ELEC
Electrical system
5. Turn the engine start switch to OFF.
6. Install the main relay
a
and relay cover.
Checking the engine ECM circuit
1. Disconnect the engine ECM couplers
a
,
b
, and
c
.
2. Check the wiring harness for continuity.
3. Measure the input voltage between the
engine ECM coupler terminal 37 and
ground.
4. Turn the engine start switch to ON, and
then measure the input voltage between
the engine ECM coupler terminal 53 and
ground.
5. Turn the engine start switch to OFF.
6. Remove the intake manifold (STBD).
7. Remove the fuse holder
a
, and then
disconnect the fuse holder coupler
d
.
Main relay input voltage:
Terminal
e
–Terminal
g
12.0 V (battery voltage)
e g
c
b
a
86
99
41 42
a b
c
Wiring harness continuity:
Terminal 41–Ground
Terminal 42–Ground
Terminal 86–Ground
Terminal 99–Ground
Engine ECM input voltage:
Terminal 37–Ground
12.0 V (battery voltage)
Engine ECM input voltage
(reference data):
Terminal 53–Ground
11.6 V
37
c
53
c