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Re: ADLD Cable 84 Corvette

Subject: Re: ADLD Cable 84 Corvette
by anesthes on 2008/9/23 15:16:07

Quote:

Blade_1 wrote:

Questioning something posted as fact is always good. If you know something different, then post it (and you obviously do know alot).

That is what I did on the fuel pump thread..

Quote:

Blade_1 wrote:
Just saying or implying that something is wrong doesn't mean a damn thing. It doesn't tell or show anybody anything.

When did I do that? When I read Andy's statement about the IPS I said "hrmm, that sounds wrong but I don't know for sure. Here is why I think so" and illustrated the numbers on the later ECM's. He then realized he made an error in his statement, and we both went on with our lives.

Here you suggested that the '86 up ECM's can do updates via aldl. I responded with "oh?" as in "please enlighten me, I was under the impression that doesn't work. It would have been a nice feature"...

Quote:

Blade_1 wrote:

If there is conflicting good info, let's get to the bottom of the issue.

Like the fuel pump thing. If I remember the schematic correctly, the OP circuit was in PARALLEL with the FP circuit. Which SEEMS to indicate that OP circuit failure would still allow fuel delivery.

But since I don't know ALL about electrical schematics (like you pointed out thank you), it is not as definitive to me as text in a tech article which IS pretty clear.

Ok.. But I pointed it out. And that was about the third time that week I pointed it out. Other members suggested you try for yourself - unplug the OP switch. You 'seemed' to rather be concerned about the text in the magazine than a scientific test.

Quote:

Blade_1 wrote:

Now, as far as ECM read and write capabilities ('give' and 'take' commands/bi-directional control), that started in '86. That's according to MY source. Maybe they're wrong too. But you haven't shown me too much...

Your source is correct that a mode-4 is supposed to exist. It is supposed to allow you to clear DTC codes, enable/disable closen loop, reset IAC, etc (but not change calibration data). Supposedly this works with the GM TECH1. It does not work with my Snapon scanner, nor does it work with other ALDL programs I've used. (specifically to reset DTC codes).

Everyone I've talked to says it does NOT work, however one guy I talked to whom I respect to the highest degree says Mode4 *DOES* work on his 1227730 ECM, so in light of 'solving this mystery' I asked him to elaborate. (because I'd like to use it too).

In regards to changing calibration info (things beyond the GM scope of mode-4) you cannot modify the calibration data through the ALDL even if you do get the mode-4 stuff to work.

Here is a good link regarding what mode-4 is supposed to do:

http://www.andywhittaker.com/ECU/ALDL/tabid/76/Default.aspx

The NVRAM hack is a 2-part thing. It's a source code change in the BIN to allow uploading of CAL DATA via ALDL into some buffer space, and it's adding memory to the ECM for that buffer space. Allows 'realtime' tuning via the ALDL. Personally, I prefer the Ostrich since it will work with damn near any GM ECM that uses a prom.

-- Joe

Saw Blades