Actron AutoAnalyzer CP7665 - Manual (Page 23)

23
Ignition System Wires
This test measures the re-
sistance of spark plug and
coil tower wires while they
are being flexed. This test
c a n b e u s e d f o r
distributorless ignition sys-
tems (DIS) provided the sys-
tem does not mount the igni-
tion coil directly on the spark
plug.
Test Procedure:
1. Remove ignition sys-
tem wires one at a time from
engine.
• Always grasp ignition system
wires on the boot when removing.
• Twist the boots about a half
turn while pulling gently to re-
move them.
• Refer to vehicle service manual
for ignition wire removal pro-
cedure.
• Inspect ignition wires for
cracks, chaffed insulation, and
corroded ends.
NOTE: Some Chrysler products
use a “positive-locking” terminal
electrode spark plug wire. These
wires can only be removed from
inside the distributor cap. Dam-
age may result if other means of
removal are attempted. Refer to
vehicle service manual for pro-
cedure.
NOTE: Some spark plug wires
have sheet metal jackets with
the following symbol:
. This
type of plug wire contains an “air
gap” resistor and can only be
checked with an oscilloscope.
2. Insert BLACK test lead into
COM test lead jack (see Fig.
24).
3. Insert RED test lead into
test lead jack.
4. Connect RED test lead to one
e n d o f i g n i t i o n w i r e a n d
BLACK test lead to other end.
5. Turn multimeter rotary switch
to 200K
Ω
range.
6. View reading on display while
flexing ignition wire and boot
in several places.
• Typical resistance range is
3K
Ω
to 50K
Ω
or approximately
10K
Ω
per foot of wire.
• Refer to vehicle service manual
for your vehicles resistance
range.
• As you flex ignition wire, the
display should remain steady.
7. Test Results
Good Ignition Wire: Display
reading is within manufacturers
specification and remains steady
while wire is flexed.
Bad Ignition Wire: Display read-
ing erratically changes as igni-
tion wire is flexed or display read-
ing is not within manufacturers
specification.
Fig. 24
Black
Spark Plug Wire
Red