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Old 06-28-2022, 04:34 PM   #1
soundquest
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Default PLEASE HELP - Cyl. #2 Ignition coil not getting signal after changing spark plugs

Just got done changing spark plugs and coils on my 2010 Outback 2.5L (EJ253 AVLS) and now my #2 ignition coil is not firing (new SUBARU OEM coils too). What are the possible culprits for this fault? I have tried multiple new coils on it and swapped things around to confirm it is not getting signal. Appreciate the help in advance. Thanks.
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Old 06-28-2022, 08:31 PM   #2
soundquest
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BUMP. Anyone?
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Old 06-28-2022, 08:34 PM   #3
ronemus
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Sometimes a connector pin will not be captured properly and gets pushed back so it no longer makes contact; check both the plug on wiring loom and on the coil.
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Old 06-29-2022, 02:39 PM   #4
soundquest
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I was able to do some more checking and digging around. With the engine running (on 3 cylinders), I was pulling 5.5 - 6hz duty cycle on a working coil from the trigger/signal wire. On the non-working coil plug I was pulling ZERO HZ on duty cycle. But... the trigger/signal wire is getting voltage. So either I have a short somewhere in that wire somewhere going back to the ECU... or the ECU itself is bad.

Any other ideas or possibilities???
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Old 06-29-2022, 03:01 PM   #5
benflynn
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Did u verify the pins were pushed all the way in? Then ohm the wire from both ends(other I assume comes in at the main engine connector. Id also bet a pulled pin would be only cause associated with plug change, or broken wire. Both u check by homing out wire
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Old 06-29-2022, 08:30 PM   #6
soundquest
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Both of these were checked -- I also back-probed from other locations on that circuit other than at the coil plug. I did back-probe check the ECU signal wire for #2 cyl and it came back with 000 hz duty cycle. Starting to look more and more like the ECU is toast. Any other suggestions?
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