Electrical System; Checking The Electrical Component; Checking Using The Ydis; Measuring The Peak Voltage - SELVA MARINE Grey Whale 200 EFI Service Manual

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ELEC
Checking the electrical
component

Checking using the YDIS

When checking the electronic throttle valve,
accelerator position sensor, oil control valve,
or each sensor, use the YDIS.
When deleting the diagnosis record in the
YDIS, be sure to check the time that the trou-
ble codes were detected.
When checking the input voltage of a part,
the coupler or connector must be discon-
nected. As a result, the ECM determines that
the part is disconnected and a trouble code is
detected. Therefore, be sure to delete the
diagnosis record after checking the input volt-
age.
Since the main relay comes on for approxi-
mately 10 seconds after the start switch is
turned to "OFF," the power of the ECM can-
not be turned off. Therefore, if the start switch
is turned to "ON" within 10 seconds after it
was turned to "OFF," the trouble codes can-
not be deleted.
NOTE:
• Before checking the electrical components,
make sure that the battery is fully charged.
• The YDIS requires that you use an exclu-
sive communication cable and CD-ROM to
connect to a computer. For a description of
the communication cable and CD-ROM to
be used, see Chapter 9, "YDIS." Also, be
sure to check the CD-ROM version before
using it.
• To connect the YDIS, see Chapter 9,
"YDIS" or the YDIS (Ver. 1.23a or later)
Instruction Manual.
YDIS (connecting kit):
60V-85300-02-00
YDIS (CD-ROM, Ver. 1.23a):
60V-WS853-03
8-1

Electrical system

Measuring the peak voltage

To check the electrical components or mea-
8
sure the peak voltage, use the special ser-
vice tools. A faulty electrical component can
be easily checked by measuring the peak
voltage. The specified engine speed when
measuring the peak voltage is effected by
many factors such as fouled spark plugs or a
weak battery. If one of these factors is
present, the peak voltage cannot be mea-
sured properly.
DC V
WARNING
When checking the peak voltage, do not
touch any of the connections of the digital
tester leads.
CAUTION:
When testing the voltage between the ter-
minals of an electrical component with
the digital tester, do not allow any of the
leads to touch any metal parts. If touched,
the electrical component can short and be
damaged.
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