Checking The Electrical Component; Using The Ydis; Measuring The Peak Voltage - Yamaha F30B 2018 Service Manual

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.
TIP:
• 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 disconnected.
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 volt-
age.
• To connect and operate the YDIS, see the
YDIS (Ver. 2.33 or later) instruction manual.
• The software is available through YMAN (Ya-
maha Marine Associate Network).
YDIS2 Hardware Kit
90890-06884
YDIS2 Hardware Kit
LIT-YDIS2-01-KT

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.

Checking the electrical component

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.
TIP:
• 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.
A
DC V
B
A. Worldwide
B. USA and Canada
5-16
V