Page 1 of 1
engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 4:16 am
by mac1
got the car running good and all but I cant figure this one out.
code vers 3.2.1 on the base tune supplied by Matt Cramer for the Probe gt ZE they have in the shop.
I tried another map sensor mpx4250
D19 shows 5v on one side and 0v on the other
voltage at AD0-1 on the stim is 1.64v
with 18" of vacuum applied via a vacuum pump i get .445v
with car running I can only get ~14.5" of vacuum
tried the calibration menu and in order to get it to "0" vacuum it will also drop the kpa below my normal altitude of mid 90's
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 4:34 am
by jsmcortina
Where is the "psi" number coming from? What is the MAP sensor reading in kPa ?
MSQ and datalog.
James
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 1:20 pm
by mac1
96.6kpa at 2.4psi sitting on the stim, tried another map sensor but still.
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 1:33 pm
by jsmcortina
What is your barometer reading? I'm guessing it is showing about 80kPa ?
James
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 1:59 pm
by mac1
correct baro is 80kpa. Also I checked 2 other boards and they read 94kpa with the stim.
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 2:42 pm
by jsmcortina
So how is baro 80kPa when MAP is 94kPa ? They should both be reading atmospheric pressure on the bench.
Near sea level that's approaching 100kPa. Up a mountain that could be 80kPa or less.
James
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 2:59 pm
by mac1
http://www.youtube.com/watch?v=RqsuyAVbv1o
there's a video of it. what voltages should I be reading at the Map sensor pins?
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 3:06 pm
by jsmcortina
It depends on what altitude you are at.
James
Re: engine off and TS reads 2psi
Posted: Thu Jun 14, 2012 8:06 pm
by mac1
well I reloaded the 3.2.1 code and it went back to normal thank god. As soon as I load the base tune .msq from DIY's Probe that's when it changes. So now I have Baro and kpa matching and vacuum now matches my vacuum pump. map reads 95.9kpa
so the it must have been the calibration for the map sensor that I couldn't figure out but I did try messing with it.
Re: engine off and TS reads 2psi
Posted: Fri Jun 15, 2012 5:31 am
by Matt Cramer
If you used the MSPNP Probe tune, please keep in mind that the MSPNP's baro sensor is a 1 bar unit! For anything other than an MSPNP, you'll need to fix the baro sensor calibration.