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Engine control unit and component
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. Check the battery and wire
harness if the input voltage is less than the
specified value. Check the components be-
tween the battery and the input voltage mea-
suring point if there is no problem with the
battery and wire harness.
If the tester probe cannot be inserted into the
coupler, prepare a test lead suitable for the
measurement.
Engine control unit and compo-
nent
Checking the main relay
1. Remove:
• Relay cover
• Main relay “1”
2. Check:
• Relay continuity
No continuity Replace.
Do not reverse the battery leads.
a. Connect the positive battery lead to the
terminal “a”, and the negative battery lead
to the terminal “b”, and then check for con-
tinuity between the terminals “c” and “d”.
Digital circuit tester
90890-03243
Digital multimeter
YU-34899-A
Peak voltage adapter B
90890-03172
Peak volt adapter
YU-39991
Tester leads
90890-06976
Relay continuity
Terminal “c”–Terminal “d”
1
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