Yamaha F150B, Service Manual

Page: 139 / 458

5-14
Engine control units and components
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10
A
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.
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.
3. Measure the input voltage between the
terminal
e
and ground, and the terminal
f
and ground.
Test lead:
Terminal, male
a
: 9E212-10303
Terminal, female
b
:
(commercially available)
a
b
a
Battery lead
Relay terminal
c d
Connect
Disconnect
Main relay input voltage:
Terminal
e
–Ground
Terminal
f
–Ground
12.0 V (battery voltage)
a
b
d
c
f
e
Checking the electrical component / Engine control units and components