Ignition System Diagnostic Flow Chart - Husqvarna 545 Mark II Workshop Manual

9.10 Ignition System Diagnostic Flow Chart

Is a strong
blue spark
present?
NO
Is a spark
weak or is there WEAK SPARK
no spark?
NO SPARK
Disconnect stop
wire from ignition
module and re-test.
Is a strong
blue spark
present?
YES
Repair damaged
stop wire or stop
switch.
74 - Troubleshooting
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 tester.
YES
Run unit.
Remove ignition
module mount-
ing bolts, clean
connections, set air
gap and re-test.
NO
Is a strong
blue spark
present?
NO
Replace the
ignition module.
.
Inspect flywheel key and
key way for sheared key.
Is flywheel
key way
damaged?
YES
YES
Problem is not in ignition
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
Is the wire
NO NO
damaged ?
system.
Perform cylinder
compression test.
Verify fuel system.
Replace the
ignition module.
722 - 003 - 26.03.2019
End Test
YES