Checking the electrical component
5-17
Checking the electrical compo-
nent
Using the YDIS
When checking the TPS, ISC valve, high-pres-
sure fuel pump, fuel injector, and related sen-
sors, use the YDIS.
• When deleting the diagnosis record in the
YDIS, make sure to check the time that the
trouble codes were detected.
• When checking the input voltage of a part,
the coupler or connector must be disconnect-
ed. As a result, the engine ECM determines
that the part is disconnected and a trouble
code is detected.
Therefore, make sure to
delete the diagnosis record after checking
the input voltage.
• To connect
and operate the YDIS, see the
YDIS (Ver. 2.40 or later) instruction manual.
• The software is
available through YMAN
(Yamaha Marine Associate Network).
Measuring the peak voltage
When measuring the peak voltage, do not
touch any of the connections of the digital
tester probes.
When measuring the peak voltage between
the terminals of an electrical component
using the digital tester, make sure that the
leads do not contact any metal parts. Other
-
wise, the electrical component may short-
circuit and be damaged.
To check the electrical components or mea-
sure the peak voltage, use the special service
tools. A
malfunctioning electrical component
can be checked easily by measuring the peak
voltage. The specified engine speed when
measuring the peak voltage is affected by
many factors, such as fouled spark plugs or a
weak battery. If one of these factors is present,
the peak voltage cannot be measured proper-
ly.
• Before measuring the peak voltage, check all
of the wire harnesses for corrosion. Also,
make sure that the wire harnesses are con
-
nected properly and that the battery is fully
charged.
• Use peak
voltage adapter with the recom-
mended digital circuit tester.
• Connect the
positive pin of peak voltage
adapter to the positive terminal of the digital
tester, and the negative pin to the negative
terminal.
• When measuring the
peak voltage, set the
digital circuit tester to the DC voltage mode.
YDIS 2 HARDWARE KIT II
90890-06884
Digital circuit tester
90890-03243
Peak voltage adapter B
90890-03172
DC V
To Next Page
