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drivenachodrive
Samba Member
Joined: May 05, 2010
Posts: 152
Location: Flagstaff
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 Posted: Mon Dec 22, 2014 11:17 pm Post subject: |
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Thanks, tschroeder0, that gives me some food for thought. A quick question: my engine is a 1997 model; will the ABS goo still be relevant to my engine? Thanks a lot.
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Driving around the world in a 1984 VW Vanagon
www.drivenachodrive.com
Read our book: www.drivenachodrive.com/book |
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tschroeder0
Samba Member
Joined: April 14, 2008
Posts: 2096
Location: Boulder CO
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| Posted: Tue Dec 23, 2014 12:08 am Post subject: |
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Sure!
To mu knowledge in 97 some of the "sport" models did have abs, so, possibly.
The other question of my own related to this issue that maybe someone can answer. Does anyone know how the Neutral switch is delt with? I have always wondered if the various idle/vss issues may have something to do with that switch?
I have always had an idle on my 99 2.2 that wants to pull itself back down to a quite low idle no mater what I do, I feel that all of these issues are interconnected in some way? |
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vanis13
Samba Member
Joined: August 15, 2010
Posts: 3100
Location: ABQ NM USA.... Except when not
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| Posted: Tue Dec 23, 2014 8:04 am Post subject: |
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| tschroeder0 wrote: |
| ......the code related to no vss signal is P0500, |
FWIW on my 1999 2.5 the no VSS signal condition caused codes
1507
1100
1101
Once VSS was properly present these codes were gone
The results of these codes include
engine dying when coming to a stop (since the engine doesn't know to increase idle / stop relying on momentum to keep the revs up)
cutting out at speed - like at a continual cruise at 70 the engine reduces output, loses response to incresing throttle, and requires a release of the throttle to allow increasing throttle to work again
bad mpg (like 8mpg) once in what I think others have called "limp mode"
also FWIW, my VSS journey got me to this $3 VSS solution that reads actual speed so, among other things, it is useful with a cruise http://www.thesamba.com/vw/forum/viewtopic.php?t=613930&highlight=vss
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83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make |
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tschroeder0
Samba Member
Joined: April 14, 2008
Posts: 2096
Location: Boulder CO
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| Posted: Tue Dec 23, 2014 1:26 pm Post subject: |
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those codes are related to idle control, neutral switch, starter switch...which again makes me wonder about how the neutral switch wiring is delt with.
I am going to take a look at mine tomorrow just to see, I did not do my harness so I am not quite sure.
nice work on the vss and sorry for hijacking this a bit. |
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wcdennis
Samba Member
Joined: July 20, 2004
Posts: 955
Location: Winston-Salem NC
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| Posted: Tue Dec 23, 2014 8:33 pm Post subject: |
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| I have heard of folks using the switch on the parking brake to simulate the neutral signal. I'm not sure if most converters even connect that wire. I know it was not important on the OBD1 conversions. |
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syncrodoka
Samba Member
Joined: December 27, 2005
Posts: 12008
Location: Santa Cruz, CA
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| Posted: Wed Dec 24, 2014 12:25 am Post subject: |
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I use the parking brake to trigger the neutral signal on my OBD1 conversion. It changes the idle speed as soon as the parking brake is dropped.
There are directions on how to hook it up here somewhere here and on the subaruvanagon yahoo group. It has been too long since I did it that I don't remember exactly what I did. |
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syncrodoka
Samba Member
Joined: December 27, 2005
Posts: 12008
Location: Santa Cruz, CA
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tschroeder0
Samba Member
Joined: April 14, 2008
Posts: 2096
Location: Boulder CO
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| Posted: Wed Dec 24, 2014 9:40 pm Post subject: |
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| thanks for that, I am curious, do you know what exactly it is doing? is it applicable to later obd2. |
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dannyzic
Samba Member
Joined: May 26, 2016
Posts: 1
Location: Maine
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| Posted: Thu May 26, 2016 6:23 pm Post subject: Re: Writeup: DIY Subaru speed sensor simulator |
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Not sure if anybody is still interested in the cheap hack but I was able to use an arduino pro mini with a few lines of code to fool the ECU.
The idea is that it sends a pulse between 32hz and 96hz for 2 seconds then picks a new one. Its a simple loop, here is the code I used.
void setup() {
}
void loop() {
tone(10, random(32,96));
delay(2000);
}
The output is on pin 10.
this is a link to the arduino I used and you will need an FTDI programmer to load the coad from USB
http://www.ebay.com/itm/172078431585?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Works for now I will post more information or an update if anyone is interested. |
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