Date: Wed, 20 Dec 2006 15:14:26 -0800
Reply-To: jon <jon@KENNEKE.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: jon <jon@KENNEKE.COM>
Subject: Re: More AFM/ECU reverse engineering results coming
In-Reply-To: <4589C051.2080700@charter.net>
Content-Type: TEXT/PLAIN; charset=US-ASCII
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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