Checking The Electrical Components; Measuring The Peak Voltage; Measuring Low Resistance - Yamaha E40G Service Manual

Checking the electrical
components

Measuring the peak voltage

NOTE:
Before troubleshooting the peak voltage,
check that all electrical connections are tight
and free from corrosion.
The condition of the ignition system can be
determined by measuring the peak voltage.
Cranking speed is affected by many factors,
such as fouled or weak spark plug. If one of
these factors is present, the peak voltage will
be lower than specification. In addition, if the
peak voltage is lower than specification the
engine will not operate properly.
w
When checking the peak voltage, do not
touch any of the connections of the digital
circuit tester leads.
NOTE:
9 Use the peak voltage adaptor with the digi-
tal circuit tester.
9 When measuring the peak voltage, set the
selector on the digital circuit tester to the
DC voltage mode.
9 Connect the positive pin on the peak volt-
age adaptor to the positive terminal of the
digital circuit tester.
6F65G11
Special service tools/Checking the electrical components

Measuring low resistance

When measuring a resistance of 10 or less
with the digital circuit tester, the correct mea-
surement cannot be obtained because of the
internal resistance of the tester. To obtain the
correct value, subtract the internal resistance
from the displayed measurement.
Correct value =
displayed measurement
- internal resistance
NOTE:
Obtain the internal resistance of the digital
circuit tester by connecting both of its probes
and checking the display.
6B480010
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