Why
the name
TwEECer?
Those who work with the Ford EFI system refer to
the PCM as the E-E-C (each letter sounded out) or as the EEC (as in
EEK). Just like tweaking your tune, we played on the word
"Tweak" and came up with TwEECer.
How does the
TwEECer Work?
The
Ford EEC contains a PROM (Programmable
Read Only Memory) to permanently store
the OEM calibration (the stock tune).
The EEC-IV
EPROM is difficult to re-write, though
it is possible, it is not something
that would be useful as a commercial
product for our target market. The
EEC-V (1996 to 2004) uses an
EEPROM, which can be reasonably
erased and re-written using the
OBD-II standards.
The EEC has a card-edge interface connection at
the rear of the unit called the Service
(J3) port, where an external EEPROM can
be connected. When connected to
this port, the contents of the external
EEPROM can be substituted for the
internal (E)EPROM. This this
is how the TwEECer and all other Chip
Module makers, can make changes to the OEM
calibration. The 1996 and newer
vehicles can be re-flashed using a hand
held programmer connected to the OBD-II
interface. The TwEECer does not
make use of the OBD-II port, we ONLY interface
through the Service port. There is
no
Service port on Ford PCM's beginning in
2005, that is why TwEECer vehicle
support ends with
the 2004 year models.
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