Date: Wed, 20 Dec 2006 21:47:08 -0500
Reply-To: ------------------------- <vw4x4@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: ------------------------- <vw4x4@VERIZON.NET>
Subject: Re: More AFM/ECU reverse engineering results coming
In-Reply-To: <Pine.LNX.4.58.0612201821160.32511@kenneke.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
What I'm guessing is that the pulsing or high speed switching of
the idle stablizer, (like a SCR) would create to much heat.
Behind the tail light it gets cooled very easily. If install in
the ECU it may gennerate to much heat, under
the back seat. Golf/Jetta has the ECU mounted in the fresh air
dusting to the interior. Plenty of cool air.
Just my thoughts.
jon wrote:
>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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