Checking The Engine Ecm Circuit - Yamaha F200B Service Manual

Checking the electrical component / Engine control system and component
5. Turn the engine start switch to ON, and
then measure the input voltage between
the terminals e and g.
Main relay input voltage:
Terminal e–Terminal g
12.0 V (battery voltage)
6. Turn the engine start switch to OFF.
7. Install the main relay, and then install the
relay cover and fuse cover.
8. Install the intake manifold (STBD). See
"Installing the intake manifold" (6-18).

Checking the engine ECM circuit

1. Remove the engine ECM cover.
2. Remove the engine ECM, and then dis-
connect the engine ECM couplers a, b,
and c.
a
b
c
3. Check the wiring harness for continuity.
e
g
Wiring harness continuity:
4. Measure the input voltage at the engine
Engine ECM input voltage:
5. Remove the intake manifold (STBD).
6. Remove the fuse holder 1, and then dis-
b
c
69 68
76
b Terminal 46–Ground
c Terminal 68–Ground
c Terminal 69–Ground
c Terminal 76–Ground
ECM coupler a.
a
7
a Terminal 7–Ground
12.0 V (battery voltage)
See "Removing the intake manifold" (6-
17).
connect the fuse holder couplers d and
e.
46
5
5-28