TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

Eectch98-Part5.fm
not cutting it up to reverse engineer it till it fails. Oh I did something for a
timer reset and register clear, but I forget.
EPEC
The following information about SVO’s add-on processor that augments the eec came
from Super Ford’s web site:
http://www.d-p-g.com/superford/april_97/eZ.htm
EPEC consists of the EPEC processor module, a 6 ft. EPEC-to-PC serial interface
cable, an EEC-IV module to EPEC module cable called a Wiring Harness Adapter, a
short harness to connect to the Input/Output devices, several floppy disks containing
the Windows calibration software and a small manual mainly for start-up use.
$1395 and a lap-top or other PC is all that’s required.
Sam Guido at General Systems Research is the architect of EPEC, which is often
referred to as the "Super Extender" by SVO insiders. It purportedly gives everyone
the power to make the Mustang EEC-IV engine management do what you want.
For the first time, fuel and spark functions are completely under the control of the
operator. It is also a sophisticated data logger, so examining what’s happening
inside your EEC-IV system, like air temperature, air mass, rpm, etc., is now possible
with great accuracy.
SVO is pretty sure the EPEC module will work with any EEC-IV controlled engine,
though it’s been tried only on the Mustang. Other applications may require that one
modify the interconnecting harness supplied with the EPEC. Also, other differences
in strategies among the various versions of EEC-IV, like EGR operation for example,
may require one to toggle on or off certain functions at certain times, but what and
when is something you’ll have to discover on your own.
The EPEC is easy to install, thanks to the dedicated wiring harness, and should be
operational as fast as you can access your EEC-IV computer and plug in the harnesses
-- say 10 minutes. More time consuming will be wiring the seven input/output
devices to the short EPEC harness. These are devices you select, such as nitrous
triggers and timers, along with data logging hardware such as MAP sensors, thermocouples,
etc. The EPEC instruction manual is not in a printed format but is
delivered on floppy disks. A short, printed, manual of start-up instructions is
packaged with each kit.
EPEC’s Windows software offers simple operation. Both table and graph information
is plotted.
EPEC works by turning off certain EEC-IV functions and substituting its own. This
means EEC-IV’s adaptive programming is taken off line, so the EEC isn’t constantly
battling the EPEC over engine control. Its ability to switch off most of EEC means
it has far too much latitude with fuel and spark to remain even remotely within
emissions guidelines so it will never be CARB exempted.
For example, to work with the fuel system, you start with the Fuel heading, click
and hold the mouse to reveal a menu, select from that menu and flip through the layers
of fuel control. Highlight the function you want by clicking the mouse key,
enter the parameter you desire and that’s about it. Fueling is not handled by
spelling out a specific injector pulse width, for example. Instead, there are 11
fuel control parameters available, each with a percentage scale you can easily dial
in. The fuel control parameters are:
· Idle A/F Ratio: Controls closed throttle A/F ratio based on rpm.
EEC-IV Technical Notes: Modifications/Upgrades69 last edited: 9/29/98