Checking The Engine Ecm Circuit - Yamaha F225F Service Manual

ELEC
g
Main relay input voltage:
Terminal e–Terminal g
12.0 V (battery voltage)
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.
a
99
c
42 41
5-23
Electrical system
e
a
b
c
b
86
Wiring harness continuity:
Terminal 41–Ground
Terminal 42–Ground
Terminal 86–Ground
Terminal 99–Ground
3. Measure the input voltage between the
engine ECM coupler terminal 37 and
ground.
c
37
Engine ECM input voltage:
Terminal 37–Ground
12.0 V (battery voltage)
4. Turn the engine start switch to ON, and
then measure the input voltage between
the engine ECM coupler terminal 53 and
ground.
c
Engine ECM input voltage
(reference data):
Terminal 53–Ground
11.6 V
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.
53