Ignition System Diagnostic Flow Chart - Husqvarna 545RXT AT Workshop Manual

16.2 Ignition System Diagnostic Flow Chart

Is a strong blue
spark present?
NO
Is a spark weak
WEAK SPARK
or is there no
spark?
NO SPARK
Disconnect stop
wire from ignition
module and re-
test.
NO
Is a strong blue
spark present?
YES
Repair damaged
stop wire or stop
switch.
Perform visual inspection of unit.
Inspect spark plug wire, boot connections.
Repair/replace any problem items.
Install new, properly gapped, manufacturer specified spark plug.
Stop switch must be in run position.
Perform Spark Test (See separate instructions).
Remove spark
YES
tester. Run unit.
Remove ignition
module mount-
ing bolts, clean
connections, set
air gap and re-
test.
Is a strong blue
spark present?
NO
Replace the igni-
tion module.
Inspect flywheel key and key
way for sheared key.
Is flywheel
key way
damaged?
YES
YES
Replace damaged
components.
YES
Does engine
start and run
properly?
NO
Inspect black wire for damage.
Measure black wire between
core and end of the wire,
should show below 1.0 OHM
NO
NO
Problem is not in igni-
tion system.
Perform cylinder
compression test.
Verify fuel system.
Replace the igni-
End Test
Is the wire
damaged ?
YES
tion module.
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