engine off and TS reads 2psi

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mac1
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engine off and TS reads 2psi

Post 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
95 Probe v6-t MS1
00 Accent 2.0L-T,Ms1
14 Factory Five 818 MS2 4 ebc/meth only
03 Tiburon v6 SC 1st ever MS
93 Tracer KLDE,Compounds w/2 of everything, Twin Megasquirt ?
00 Lotus Esprit v8-TT Full MS3x/ls1 coils/water/Meth
97 200sx 1.6L Stock, MS2/3.0, Sequential, CBR1000r coils
jsmcortina
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Re: engine off and TS reads 2psi

Post by jsmcortina »

Where is the "psi" number coming from? What is the MAP sensor reading in kPa ?

MSQ and datalog.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
mac1
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Posts: 283
Joined: Wed Nov 23, 2005 5:14 pm
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Re: engine off and TS reads 2psi

Post by mac1 »

96.6kpa at 2.4psi sitting on the stim, tried another map sensor but still.
95 Probe v6-t MS1
00 Accent 2.0L-T,Ms1
14 Factory Five 818 MS2 4 ebc/meth only
03 Tiburon v6 SC 1st ever MS
93 Tracer KLDE,Compounds w/2 of everything, Twin Megasquirt ?
00 Lotus Esprit v8-TT Full MS3x/ls1 coils/water/Meth
97 200sx 1.6L Stock, MS2/3.0, Sequential, CBR1000r coils
jsmcortina
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Re: engine off and TS reads 2psi

Post by jsmcortina »

What is your barometer reading? I'm guessing it is showing about 80kPa ?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
mac1
Experienced MS/Extra'er
Posts: 283
Joined: Wed Nov 23, 2005 5:14 pm
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Re: engine off and TS reads 2psi

Post by mac1 »

correct baro is 80kpa. Also I checked 2 other boards and they read 94kpa with the stim.
95 Probe v6-t MS1
00 Accent 2.0L-T,Ms1
14 Factory Five 818 MS2 4 ebc/meth only
03 Tiburon v6 SC 1st ever MS
93 Tracer KLDE,Compounds w/2 of everything, Twin Megasquirt ?
00 Lotus Esprit v8-TT Full MS3x/ls1 coils/water/Meth
97 200sx 1.6L Stock, MS2/3.0, Sequential, CBR1000r coils
jsmcortina
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Re: engine off and TS reads 2psi

Post 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
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
mac1
Experienced MS/Extra'er
Posts: 283
Joined: Wed Nov 23, 2005 5:14 pm
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Re: engine off and TS reads 2psi

Post 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?
95 Probe v6-t MS1
00 Accent 2.0L-T,Ms1
14 Factory Five 818 MS2 4 ebc/meth only
03 Tiburon v6 SC 1st ever MS
93 Tracer KLDE,Compounds w/2 of everything, Twin Megasquirt ?
00 Lotus Esprit v8-TT Full MS3x/ls1 coils/water/Meth
97 200sx 1.6L Stock, MS2/3.0, Sequential, CBR1000r coils
jsmcortina
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Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
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Re: engine off and TS reads 2psi

Post by jsmcortina »

mac1 wrote:http://www.youtube.com/watch?v=RqsuyAVbv1o

there's a video of it. what voltages should I be reading at the Map sensor pins?
It depends on what altitude you are at.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
mac1
Experienced MS/Extra'er
Posts: 283
Joined: Wed Nov 23, 2005 5:14 pm
Contact:

Re: engine off and TS reads 2psi

Post 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.
95 Probe v6-t MS1
00 Accent 2.0L-T,Ms1
14 Factory Five 818 MS2 4 ebc/meth only
03 Tiburon v6 SC 1st ever MS
93 Tracer KLDE,Compounds w/2 of everything, Twin Megasquirt ?
00 Lotus Esprit v8-TT Full MS3x/ls1 coils/water/Meth
97 200sx 1.6L Stock, MS2/3.0, Sequential, CBR1000r coils
Matt Cramer
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Posts: 17499
Joined: Thu Apr 16, 2009 8:08 pm

Re: engine off and TS reads 2psi

Post 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.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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