Using The Digital Tester; Engine Control Unit And Component; Checking The Main Relay - Yamaha F225F Service Manual

Checking the electrical component / Engine control unit and component

Using the digital tester

The electrical technical data apply to the
measurements taken using the Yamaha rec-
ommended tester.
The resistance values shown are the values
taken before the engine is started. The actual
resistance may vary depending on the envi-
ronmental conditions and ambient tempera-
ture.
The input voltage changes depending on the
battery voltage.
If the tester probe cannot be inserted into the
coupler, prepare a test lead suitable for the
measurement.
a
Digital circuit tester: 90890-03174
Test lead:
Terminal, male a: (commercially avail-
able)
Terminal, female b: (commercially avail-
able)
Engine control unit and
component

Checking the main relay

1. Remove the relay cover and main relay
a.
2. Connect the positive battery lead to the
Battery lead
Connect
b
Disconnect
3. Measure the input voltage between the
Main relay input voltage:
4. Turn the engine start switch to ON, and
a

Engine control unit and component

terminal a, connect the negative battery
lead to the terminal b, and then check
for continuity between the terminals c
and d. Replace the relay if there is no
continuity. NOTICE: Do not reverse the
battery leads.
c
d
b
c
terminal e and ground, and the terminal
f and ground.
Terminal e–Ground
Terminal f–Ground
12.0 V (battery voltage)
then measure the input voltage between
the terminals e and g.
a
Terminal
d
e
f
5-22
0
1
2
3
4
5
6
7
8
9
10
A