Testing Ignition System; Test Ing Main Wiring And Safety Switches - Arctic Cat 1987 AFS El Tigre Service Manual

Testing
Ignition System
The ignition system used on all A.F .S. models
(KOKUSAN DENKI CDI) is of the "closed" type.
The "closed" ignition system offers a safety ad-
vantage to the consumer in that the ignition is
dependent on a complete circuit for its ground. If
the circuit is broken (connection should lose con-
tact or a connector should become pulled apart),
ignition is lost and the engine will instantly stop.
The troub les hooti ng procedure for the standard
"non-c losed" ig nitio n system cannot be used
when troub leshooting t he "closed" ign it ion
system, use the following procedure.
1. Remove th e spark plugs and visually check
condition. Rep lace any fouled plu g. Attach
the spark plugs to the high tension leads and
ground them on the cylinder head(s).
Fig. 5·1
B167
II
NOTE: Make sure all switches are in the ON
position.
• CAUTION •
Never crank the engine over without grounding
tile spark plugs. Damage to coils and/or COl unit
may result.
2. Crank the engine over quick ly and check for
spark. If no spark is present, check to make
sure throttle cable is properly tens ioned by
compressing the thrott le control. . While
holding t he throttle contro l in this posit ion,
crank the engine over and check fo r spark. If
100
spark is now present, adju st throttle-cable
tensio n to remove slack from th e cable. If no
spark is present, proceed to step 3.
3. Disconnect the main wiring harness from the
eng ine; then us ing a short piece of wire, jump
the black and brown in the engine four wire
plug. Crank the engine over. If spark is pre-
sent, the problem is either one or more of the
follow ing:
a. Defective ignition switch
b. Defective emergency stop switch
c. Defective safety switches in throttle-
control handle
d. Corroded or loose wire connection at the
throttle-cont rol han dle, ignition switch, or
main wiring harness
To check these possible causes, proceed to
Testi ng Main Wi ri ng and Safety Switches. If no
spark is present, proceed to Tes ting Ignition Co il
Output.
r
Testing Main Wiring
and Safety Switches
1. Check wire connect ions at ignit ion switch
and at the th rottle-cont rol hand le for tight-
ness and clean liness. If connec t ions appear
dirty or corroded, clean with fine sandpaper
and compressed air; then connect all w ires
and squeeze connections with a pliers for ad-
ded t ightness. US ing an ohmmeter, connect
one lead to the black wire in the main wiring
harness. Connect the other ohmmeter lead to
the brown wire in the harness.
2. With all switches in the ON pos it ion, the
meter must read CLOSED.
3. If meter reads OPEN, disconnect the ign ition
switch and connect the ohmmeter leads to
each of the probes on the back of the switch .
If the mete r reads OPEN (with switch in ON
position), rep lace t he switch. If the meter
reads CLOSED, proceed to step 4.
4. Disconnect the two connectors from the
throttle-contro l handle. Connect one ohm-
meter lead to each of the two probes located
on the front end of the thrott le contro l. With
the emergency stop sw itch, located on top of
the control, in th e ON (pul led-up) pos iti on, the
meter must read CLOSED.
(