Ski-Doo Formula S 1998, Shop Manual

Page: 240 / 338

Section 06 ELECTRICAL
Subsection 07 (TESTING PROCEDURE)
06-07-3
NIPPONDENSO CDI SYSTEM TESTING
Tundra II LT
IGNITION SYSTEM TESTING
SEQUENCE
In the case of ignition problems, check the follow-
ing in the prescribed order until the problem can
be solved.
1. Sparking/spark plug condition;
2. Electrical connectors;
3. Ignition switches, tether cord cap switch and
emergency switch;
4. Ignition coil output;
5. Ignition module output;
6. High voltage coil output.
LIGHTING SYSTEM TESTING
SEQUENCE
1. Electrical connectors;
2. Magneto output (lighting generator coil).
Testing Conditions
Voltage measurements are always taken upon ve-
hicle starting. Readings when the engine is run-
ning will be higher than indicated range. Part
temperature must be approximately 20°C (room
temperature), otherwise readings could be dis-
torted.
Analysis of Readings
Voltage Readings
When testing the different magneto components,
it is important to take into consideration that read-
ings vary according to the force applied onto the
manual starter. It is therefore important to employ
enough force upon each trial.
The reading must be 3 times within or above the
range indicated in the corresponding table. If the
reading is too low, the part is considered to be de-
fective and must be replaced.
Resistance Readings
Place multimeter selector switch to
Ω
in order to
measure resistance. Readings must be within the
indicated range. Otherwise, the part is considered
to be defective and must be replaced.
Intermittent Ignition Problems
It is difficult to make a diagnostic in the case of
intermittent ignition problems. Thus, problems
occurring only when the engine operating temper-
ature is normal must be checked in similar condi-
tions.
In most cases when problems are caused by tem-
perature or vibrations, these can only be solved by
replacing parts. Most problems cannot be detect-
ed when the engine is stopped.
Multiple Problems
As a matter of fact, more that one component can
be defective. As a result, if the problem remains
although a part was replaced, start over the whole
verification from the beginning in order to identify
the other defective component.
1. SPARKING
During this operation, it is important to use the
snowmobile spark plug and not a new one. Bring
the plug in contact with the engine. If no spark is
produced, replace the spark plug with a new one
and do the test again.
2. ELECTRICAL CONNECTOR
TESTING
Make sure that none of the connectors are dis-
connected.
-
CAUTION
When taking measurements, it is useless to
try to start the vehicle since readings would
then be distorted.