Electrical Analysis; Electrical Component Check Using The Ydis; Power Supply To The Ecm; Peak Voltage Measurement - Yamaha Waverunner VXS VX1800 Service Manual

Electrical analysis

Electrical component check using the
YDIS
When checking the TPS, APS, RPS or other
sensors, use the YDIS.
When deleting the diagnosis record in the
YDIS, make sure to check the time when the
diagnostic codes were detected.
When checking the input voltage of a part, the
coupler or connector must be disconnected. As
a result, the ECM determines that the part is
disconnected and a diagnostic code is detect-
ed. Therefore, make sure to delete the diagno-
sis record after checking the input voltage.
Power is supplied to the ECM for about 30 sec-
onds after stopping the engine. Therefore, wait
for more than 30 seconds before restarting the
engine, otherwise the diagnostic codes will not
be cleared from the ECM.
TIP:
• Before checking the electrical components,
make sure that the battery is fully charged.
• If the tester leads are connected while using
the YDIS, diagnostic codes will be detected.
• If a diagnosis record is displayed and it is
caused by the checking steps, delete the re-
cord by using the "Diagnosis record" function
of the YDIS.
• To connect and operate the YDIS, see
"YDIS" (9-1) or the YDIS (Ver. 2.20) Instruc-
tion Manual.
• The software is available through YMAN (Ya-
maha Marine Associate Network).
YDIS2 Hardware Kit
90890-06884
YDIS2 Hardware Kit
LIT-YDIS2-01-KT

Power supply to the ECM

Push the unlock button "a" on the remote con-
trol transmitter so that power is supplied to the
ECM.
TIP:
To check that the remote control transmitter is
working properly, see "Remote control trans-
mitter check" (7-37).

Peak voltage measurement

When measuring the peak voltage, do not
touch any of the connections of the digital
tester probes.
• When testing the voltage between the ter-
minals of an electrical component using
the digital tester, do not allow any of the
leads to touch any metal parts.
• When starting the engine on land, make
sure to connect a garden hose to the wa-
tercraft for proper water supply.
To check the electrical components or mea-
sure the peak voltage, use the special service
tools. A faulty electrical component can be
easily checked 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 volt-
age cannot be measured properly.
TIP:
• Before measuring the peak voltage, check all
wiring for proper connection and corrosion,
and check that the battery is fully charged.
7-9
Electrical analysis
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