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IO-390-D Series Engine Maintenance Manual
Problem
Engine runs
Isolate EIS
rough (Cont.)
ignition
causing
roughness
(Cont.)
Roughness caused by magneto or ignition other than EIS
Engine will
Power
not start,
measured
kicks back
(8.5 to
during start
30VDC) at
or does not
power
run on EIS
terminal
Unable measure power (8.5 to 30VDC) at power terminal
© 2020 Avco Corporation. All Rights Reserved
March 2020
IO-390-D Series Engine Maintenance Manual
Problem Isolation
Unable to verify ignition correctly timed to
engine #1 cylinder TDC
LED blinks rapidly (12 times per second)
P-lead terminal grounded
P-lead terminal
Ignition verified as
not grounded
correctly timed to
(open)
engine #1 cylinder TDC
Unable to verify
ignition correctly timed
to engine #1 cylinder
TDC
LED blinks rapidly (12 times per second)
Probable Cause
Ignition not timed to
Reinstall ignition unit in accordance with
engine correctly
installation instructions
Internal ignition fault
Contact Lycoming customer support
Magneto problem
Contact magneto manufacturer
P-lead wire is connected
Check ignition switch
to ground
Check integrity of p-lead wire for
chaffing to ground
Internal ignition fault if
Contact Lycoming customer support
p-lead terminal is
grounded with wire
removed
Ignition harness wires
Check routing of harness wires
connected to incorrect
spark plugs
Internal ignition fault
Contact Lycoming customer support
Ignition not timed to
Reinstall ignition unit in accordance with
engine correctly
installation instructions
Internal ignition fault
Contact Lycoming customer support
No power to ignition unit
Verify ignition power wire is connected to
power source
Check ignition power wire integrity,
terminals & fuse
Corrective Action
12-30
Page 99
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