Engine Control Units And Components; Checking The Main Relay - Yamaha F150B Service Manual

Checking the electrical component / Engine control units and components
The resistance shown is the value taken
before the engine start. It may change
depending on the environmental conditions
and the ambient temperature.
Input voltage changes depending on the bat-
tery voltage.
If the tester probe cannot be inserted in the
coupler, prepare a test lead suitable for the
measurement.
a
Test lead:
Terminal, male a: 9E212-10303
Terminal, female b:
(commercially available)
Engine control units and
components

Checking the main relay

1. Remove the main relay a.
2. Connect the positive battery lead to the
relay terminal a, and the negative bat-
tery lead to the relay terminal b, and
then check for continuity between termi-
nals c and d. Replace the relay if out of
specification. NOTICE: Do not reverse
the battery leads.
Battery lead
Disconnect
b
3. Measure the input voltage between the
Main relay input voltage:
a

Engine control units and components

c
d
b
Relay terminal
c
Connect
terminal e and ground, and the terminal
f and ground.
e
f
Terminal e–Ground
Terminal f–Ground
12.0 V (battery voltage)
a
0
1
2
d
3
4
5
6
7
8
9
10
A
5-14