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Sparatic MAP drop -20
Posted: Sat Jul 04, 2009 7:10 pm
by Plato2k5
Sometimes while driving my MAP sensor will drop out and I will go LEAN and cause my Jeep to stumble and as it does this it jerks like I'm applying the brakes. This is not a problem that is consistent. It comes and goes...sometimes it will happen 3 times in 20 mins....others none.
The recent log shows it dropped to -20. I have the graph as an image. Its the on the top layer just left of the line. You can see the plummet towards the bottom line.
What could cause this?
Re: Sparatic MAP drop -20
Posted: Mon Jul 06, 2009 7:15 am
by Matt Cramer
Could you please post a complete copy of the log file? Sounds like it's either some very strange noise or a firmware corruption problem.
Re: Sparatic MAP drop -20
Posted: Wed Jul 08, 2009 7:20 am
by Plato2k5
Here you go Matt
Re: Sparatic MAP drop -20
Posted: Wed Jul 08, 2009 10:30 am
by Matt Cramer
Very weird. This could be some sort of voltage spike on VREF or the 12 volt input, or it could be a damaged MAP sensor.
Re: Sparatic MAP drop -20
Posted: Wed Jul 08, 2009 2:06 pm
by Plato2k5
actually now that you said that, I think it is the connection on the MAP. One of the holes that the prong goes through for you to solder.... well some of the copper came off... So I should find another connection on the board and use a jumper wire....
Re: Sparatic MAP drop -20
Posted: Wed Jul 08, 2009 2:44 pm
by Plato2k5
Ok so if the MAP sensor port is away from you and your looking from the top,..... the solder WILL NOT take on the 3rd prong. Its between the 102 and 104 yellow diode things. Can I jump this to somehwere, or is my bored messed up?
Re: Sparatic MAP drop -20
Posted: Thu Jul 09, 2009 6:48 am
by Matt Cramer
You can wire the 3rd prong to other VREF points on the board.
Re: Sparatic MAP drop -20
Posted: Thu Jul 09, 2009 7:46 am
by Plato2k5
ok lol I have no idea where those can be found...
Re: Sparatic MAP drop -20
Posted: Thu Jul 09, 2009 11:04 am
by Matt Cramer
Anything connected to "Vref" in the schematics:
http://www.megamanual.com/ms2/pcb.htm