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Date:         Wed, 20 Dec 2006 22:07:20 -0500
Reply-To:     John Lauterbach <lauterba@BELLSOUTH.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Lauterbach <lauterba@BELLSOUTH.NET>
Subject:      Re: More AFM/ECU reverse engineering results coming
Comments: To: jon <jon@KENNEKE.COM>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
              reply-type=original

My '84 7-passenger has ECU behind left taillight and Idle Stabilizer and ICM are on left side of engine compartment just ahead of coil.

Congratulations on the reverse engineering efforts.

John ----- Original Message ----- From: "jon" <jon@KENNEKE.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Wednesday, December 20, 2006 9:23 PM Subject: Re: More AFM/ECU reverse engineering results coming

> All of the vanagons I have seen have the ECU under the rear seat, and the > idle stabilizer behind the tail light. > > No big heat problems with the ECU that I can think of. But, the idle stab. > may want to be near the ambient temp of the vanagon. > > I'll have to look into that more when I get into reverse engineering the > idle stab. > > Jon > > > > On Wed, 20 Dec 2006, ------------------------- wrote: > >> "What confuses me if why they didn't simply put that functionality in the >> ECU???" >> >> >> VW Did in the Golf and Jetta 88-92. I'm assuming there is a >> heat problem >> with this in the Vanagon, because of its location. >> >> >> >> jon wrote: >> >> >I've taken apart an early (pre-86) idle stabilizer. It appears to be a >> >pulse shaping/delay unit. It is inserted in between the hall sensor and >> >the ECU. If fact, you can simply unplug both connections, and plug them >> >together to run without. It adjusts the timing based on idle RPM, I >> >assume. >> > >> >The later units are much more complex, judging by looking at Bentley. >> >One >> >of these days I'll reverse engineer one of those. Anyone have a dead one >> >they want to send me? >> > >> >What confuses me if why they didn't simply put that functionality in the >> >ECU??? >> > >> >Jon >> >(The Reverse Engineer) >> > >> >On Wed, 20 Dec 2006, John Rodgers wrote: >> > >> > >> > >> >>Sounds good to me. Anyone working on reverse engineering that idle >> >>stabilizer control module?? >> >> >> >>Regards, >> >> >> >>John Rodgers >> >>88 GL Driver >> >> >> >>jon wrote: >> >> >> >> >> >>>I have made great progress in reverse engineering AFMs, ECUs and other >> >>>funny business in the Digifant injection system. It's classic 80's >> >>>embedded CPU technology. >> >>> >> >>>I pulled apart a bad ECU to use part from to build a "sniffer". It was >> >>>interesting to see how they did it. Here is a quick explanation: >> >>> >> >>>The "brain" is a standard 6803U4PV. It's a common 80's embedded >> >>>microcontroller. Not sure what the differences are in the U4PV >> >>>version, >> >>>because I can't find a datasheet on the 'net. On the CPU daughterboard >> >>>there is also a Parallel Interface Adapter, some glue logic, and a >> >>>2732B >> >>>EPROM. The version label on this one is "FAEB02 02. 02". Anyone have >> >>>an >> >>>ECU open, and can tell me what their's says? >> >>> >> >>>On the main board, the interesting semiconductors are a Toshiba >> >>>TA7900S >> >>>regulator/watchdog with PNP shunt transistor (BD438). Across the heat >> >>>sink >> >>>is also a BD647 NPN Darlington, a Motorola TE2369 (Which I can't find, >> >>>probably a house number. Anyone know what this is?), and a BT151-500R >> >>>Thyristor. The big chip near the center is an Analog to Digital >> >>>converter. >> >>>Add to that some small signal transistors, couple of op >> >>>amp/comparators, >> >>>and finally a "Peripheral Clamping Array" on the input to the PIA/CPE >> >>>to >> >>>condition signals. >> >>> >> >>>These ECUs make magasquirts look simple. ;) >> >>> >> >>>More on AFM spring adjustments in a bit. >> >>> >> >>>Jon >> >>> >> >>> >> >>> >> >>> >> >>> >> > >> > >> > >> >


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