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Take the spark plugs out, ground them
all with a wire and put the EC2 into ignition test mode (mode 8
and Store button in my manual -- check Troubleshooting section in
your manual).
If plugs are firing and now that we
know that the MCU in controller A works, you could try to put
controller B's MCU in A's place in case controller A's MCU's
programming somehow got messed up.
It's hard to believe that the CAS
circuitry for controller A is damaged, but not B's because much of
it is shared -- unless yours is a unicorn with backup CAS input.
Carefully remove the MCUs from their
sockets using a paperclip with a 2mm tip bend at one end.
Carefully lift up one corner a bit, then the other one and so on
until the chip is out. Of course make sure you prevent damage by
static electricity.
Oh, yeah, and read the manual. A lot of
what I've written is covered there.
Finn
Finn: Thanks so much for these additional
steps to try!
Looks like we can rule out “0, 3, 4” (?) since
the injectors click away and the leading and trailing plugs
fire up nicely?
Can’t we also rule out “1” (Injector drivers)
since the injectors operated nicely in Mode 0 when “priming”?
Also, does this rule out a possible CAS
issue…maybe the CAS circuit is somehow used in firing the
plugs at “3,000 rpm” in mode 8?
Doug
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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
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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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