Using The Digital Tester; Engine Control Unit And Component; Checking The Main Relay - Yamaha F30B 2018 Service Manual

Digital circuit tester
90890-03243
Digital multimeter
YU-34899-A
Peak voltage adapter B
90890-03172
Peak volt adapter
YU-39991

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 environ-
mental conditions and ambient temperature.
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
Digital circuit tester
90890-03243
Digital multimeter
YU-34899-A
Test lead
Terminal, male "1"
(commercially available)
Terminal, female "2"
(commercially available)
Engine control unit and compo-
nent

Checking the main relay

1. Check:
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Disconnect the main relay coupler "a".
b. Measure the input voltage between the ter-
c. Turn the engine start switch to ON, and
2
d. Turn the engine start switch to OFF.
e. Connect the special service tool "2" to the
5-17

Engine control unit and component

• Main relay
minal and ground.
a
Input voltage
12 V (battery voltage)
Red (R)–Ground
Red (R)–Ground
then measure the input voltage between
the terminal and ground.
a
1
Input voltage
12 V (battery voltage)
Terminal 1–Ground
main relay "1".
R