From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Date: Fri, 9 Jan 2026 22:25:52 -0500
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Would be interesting to know which part of the A controller failed.
0) 5V power regulator
1) Injector drivers
2) Ignition coil drivers
3) Crank angle sensor input.
4)  MCU itself.

Do the injectors click when you press the Store button or when you put 
it into injector test mode?
Do the spark plugs fire when you put it into test mode?
If either of those work we can rule out 0, 3 and 4.

As for compatibility, the main difference between 13B and Renesis is the 
crank angle sensor output. The 13B has magnetic pickups and the Renesis 
has a timing wheel, so you can't switch them without reprogramming.
Then there is dwell time -- depends on iginition coils you use.
I suspect that other differences can be handled by tuning.

Finn

On 1/9/2026 5:59 PM, DOUGLAS LOMHEIM dlomheim@aol.com wrote:
> My Renesis “A” processor went INOP a few weeks ago, and I’ve done the following:  a). Verified 12 V to BOTH EC2 power pins.  b).  Verified continuity from OAT two wire thermistor to EC2.  c).  Replaced thermister with the one on my 9A project.  d).  Opened the EC2 to ensure the micro processor was still seated in its’ socket.
> The “A” side is still not functioning, and must be started on the “B” side, and when switched to “A”, it immediately dies.
>
> Are there any other trouble-shooting steps I should try?
>
> Thx.  Doug
>
> P.S.  I believe Tracy did some special EC2 processing on  Renesis EC 2s, vs RX-7 13B?  I think I have two extra EC2s, so could swap them out IF they are compatible with each other…
>
> Thx for your inputs, Doug
> Sent from my iPhone
>
>
> --
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