Where to get EEC-IV ECU specs/schematics.

[Brian Warburton, c/o Turbo Systems Ltd]

>My mechanic just told me that the code 41(always lean) code that I
>am getting is caused by a bad computer.  And a "rebuilt" one costs
>$225.
>
>Oops, I forgot to add that the mechanic said he tested all the way
>back to the computer and it checked out.  And the code 41 shows up
>in both as a hard fault and memory code.  > 

>From my recollection of older EEC-iv code, if you're getting a
code 41 for engine running self-test that means "engine lean", but
if you also get a code 41 from the continuous self-test, the engine
running self-test is just showing the symptom and not the cause, the
real cause being that the HEGO isn't switching. That means the
software isn't seeing the HEGO switch rich->lean->rich etc.  Could
be caused by anything in the HEGO circuit downstream of the
processor chip as far as and including the HEGO. EEC-iv's are pretty
ruggedly made, I think I'd try mine in another vehicle before going
out and buying a new one. 

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Brian Warburton, "Still searching for the perfect curve....."
email: bwarb at turbo.win-uk.net
                                Advanced Automotive Electronics Ltd,
                                Van-Nuys, Scotlands Drive,
                                Farnham Common, England.  SL2-3ES
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