Date: Wed, 20 Dec 2006 21:18:42 -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.4.58.0612201511030.31382@kenneke.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
"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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