[Shotimes] BARO sensor

[Adam Parrott]

>> Since we've established that an incorrect signal will not post a code in
the diagnostics <<

Actually, while there may not be any known occurrences of a bad BAP setting a
code on an MTX SHO, it is technically possible to do so when you consider the
fact that all sensors have their own piece in the self-test logic "pie" that
is programmed into all EEC calibrations(refer to the generic EEC-IV DTC's 22
and 126 for reference).

>> if for some reason the BAP sensor is in fact giving a lower voltage signal
to the PCM that is correct for the given environmental conditions, the car
will not receive proper air/fuel mixture.  Is that correct?  Might a symptom
of a bad BAP be poor fuel mileage? <<

Knowing just what and how BAP readings will affect the EEC will depend on the
strategy or calibration in question.  With regards to the MTX SHO
specifically, I can tell you that BAP readings play a much larger role in
determining spark advance than they do in fuel metering.  I can also tell you
that, even on the cars where BAP readings DO play a role in the fueling
calculations, a bad BAP would never be enough in and of itself to cause
noticeably poor gas mileage.

Adam


  ----- Original Message -----
  From: Carl Prochilo
  To: shotimes@autox.team.net
  Sent: Monday, September 19, 2005 1:08 PM
  Subject: Re: [Shotimes] BARO sensor


  Adam,  Let me impose further on your knowledge of the EEC IV program
  for the SHO.  Since we've established that an incorrect signal will
  not post a code in the diagnostics, if for some reason the BAP sensor
  is in fact giving a lower voltage signal to the PCM that is correct
  for the given environmental conditions, the car will not recieve
  proper air/fuel mixture.  Is that correct?  Might a symptom of a bad
  BAP be poor fuel mileage?
  --
  Cheers,
  Carl Prochilo
  92 Ultra Red Crimson