Using The Digital Tester; Engine Control Unit And Component; Checking The Main Relay - Yamaha F150A Service Manual

Using the digital tester

The electrical technical data applies 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.
1
Test lead:
Terminal, male "1": 9E212-10303
Terminal, female "2":
(commercially available)
Engine control unit and
component

Checking the main relay

1. Remove the main relay "1".
2. Connect the positive battery lead to the
Do not reverse the battery leads.
2
3. Measure the input voltage between the
1
4. Turn the engine start switch to ON, and
5-13

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 out of speci-
fication.
d
b
Relay terminals continuity:
Terminal "c"–Terminal "d"
terminal "a" and ground, and the terminal
"b" and ground.
a
b
Main relay input voltage:
Terminal "a"–Ground
Terminal "b"–Ground
12 V (battery voltage)
then measure the input voltage between
terminals "a" and "b".
c
a