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  #46  
Old 09-23-2010, 07:49 PM
oab_au oab_au is offline
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Re: Gas pressure drop between Tranny Shifts

Quote:
Originally Posted by NiftySVX View Post
Harvey you are describing traction control, but unfortunately the only subaru that had that in 2WD form was a VERY few 1995 only legacy L and LS, as an option. I always thought it was odd that it was not offered on the 94 LS SVX or the 1995 L 2wd models. I can almost promise you there is no rear speed sensor, the one in the AWD reads off the output to the rear drive which is not there. I will have to look at my wiring diagrams again when I get to them. The reduction gearset in the back of the 2wd has no place for the speed sensor to read.
Giday Nifty,good to see you back.
Well traction control stops all the wheel spin, I don't think this is the same, as long as both wheels spin the same it won't do anything, as the readings would be the same, but it would stop one wheel from spinning.
It is the back and forth spinning between the front wheels that breaks the gears, it would read this difference in speed sensor readings, to do a torque cut.

Harvey.
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  #47  
Old 09-23-2010, 07:57 PM
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Re: Gas pressure drop between Tranny Shifts

Guys, thanks a lot for all the help, I don't think I could have kept the svx in the garage as long as I have if it hadn't been for the experienced individuals on this forum! Thanks again nifty and oab!
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  #48  
Old 09-24-2010, 07:47 AM
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Re: Gas pressure drop between Tranny Shifts

Quote:
Originally Posted by oab_au View Post
Giday Nifty,good to see you back.
Well traction control stops all the wheel spin, I don't think this is the same, as long as both wheels spin the same it won't do anything, as the readings would be the same, but it would stop one wheel from spinning.
It is the back and forth spinning between the front wheels that breaks the gears, it would read this difference in speed sensor readings, to do a torque cut.

Harvey.
Let me just offer a bit of info here. I have had 2 FWD transmissions apart when I replaced the diff in my laguna. There is no sensor or wiring to the rear of the transmission on either. There is no traction control type setup at all. If I get weight more on one side or the other and decide to push the gas pedal down a bit more than I should, it will spin only 1 tire and will keep spinning until I let off the gas. You must remember the front differential is Open and therefore will not transfer power to the wheel that has traction, but will rather transfer most or all of the power to the one that is slipping.
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  #49  
Old 09-24-2010, 10:56 AM
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Re: Gas pressure drop between Tranny Shifts

Hmmm.... random sensor that does nothing, but if the wires aren't connected to it, it causes transmission codes and shifting problems... Subaru, you shouldn't have!
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  #50  
Old 09-25-2010, 02:27 PM
NiftySVX NiftySVX is offline
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Re: Gas pressure drop between Tranny Shifts

What makes you think it was a sensor that goes to the back of the transmission? The main harness goes in above the valve body and in a FWD unit there are no sensors or electric parts of any kind that are not on the valve body. If you told us the color of the wire you repaired I can tell you exactly what it connects to inside the transmission. The only sensor in the thing is the fluid temp sensor.
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  #51  
Old 09-25-2010, 05:13 PM
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Re: Gas pressure drop between Tranny Shifts

Quote:
Originally Posted by NiftySVX View Post
Harvey you are describing traction control, but unfortunately the only subaru that had that in 2WD form was a VERY few 1995 only legacy L and LS, as an option. I always thought it was odd that it was not offered on the 94 LS SVX or the 1995 L 2wd models. I can almost promise you there is no rear speed sensor, the one in the AWD reads off the output to the rear drive which is not there. I will have to look at my wiring diagrams again when I get to them. The reduction gearset in the back of the 2wd has no place for the speed sensor to read.
How did the traction control work on these 2WD boxes?
If it was offered on the Legacy, it doesn't make sense that they did not offer it on the EG33.

Harvey.
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  #52  
Old 09-25-2010, 05:51 PM
NiftySVX NiftySVX is offline
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Re: Gas pressure drop between Tranny Shifts

It was the standard power reduction/brake applying routine that is common now. The ECU cut power to the engine and/or ABS was used to apply brakes to a slipping wheel. I have never seen one that has it in person, but I know that they exist. I have seen the launch materials for the 1995 legacy that talk about it.
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  #53  
Old 09-25-2010, 06:16 PM
oab_au oab_au is offline
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Re: Gas pressure drop between Tranny Shifts

Quote:
Originally Posted by NiftySVX View Post
It was the standard power reduction/brake applying routine that is common now. The ECU cut power to the engine and/or ABS was used to apply brakes to a slipping wheel. I have never seen one that has it in person, but I know that they exist. I have seen the launch materials for the 1995 legacy that talk about it.
It would have to have 4 channel ABS, to know when they were spinning?

Harvey.
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  #54  
Old 09-26-2010, 02:37 PM
NiftySVX NiftySVX is offline
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Re: Gas pressure drop between Tranny Shifts

Yes all subarus did, but keep in mind it was only on the front wheel drive models. 4 channel ABS means that it has 4 fluid circuits to control each wheel independently, while 3 channel controls the rears as a set. As with most manufacturers, subaru has never had an ABS system that didn't have a sensor at each wheel.

I think we kinda hijacked this thread
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  #55  
Old 09-26-2010, 05:16 PM
oab_au oab_au is offline
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Re: Gas pressure drop between Tranny Shifts

Quote:
Originally Posted by NiftySVX View Post
What makes you think it was a sensor that goes to the back of the transmission? The main harness goes in above the valve body and in a FWD unit there are no sensors or electric parts of any kind that are not on the valve body. If you told us the color of the wire you repaired I can tell you exactly what it connects to inside the transmission. The only sensor in the thing is the fluid temp sensor.
How about this rear speed sensor mounted here.


This is the Aust VTD, but I do belive that the 2WD has a VSS2 sensor mounted in the same position.

Harvey.
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Last edited by oab_au; 09-26-2010 at 06:22 PM. Reason: Better picture.
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  #56  
Old 09-26-2010, 06:25 PM
oab_au oab_au is offline
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Re: Gas pressure drop between Tranny Shifts

I also noticed that all the boxes have the mounting holes for this speed sensor to mount here. May be a carry on from the early FWD.

Harvey.
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97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
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  #57  
Old 10-11-2010, 03:53 PM
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Re: Gas pressure drop between Tranny Shifts

I am going to crawl around under both my cars today to exchange o2 sensors. I will get those wire colors for yall then. I should be able to find it by the "clean newness" it should exude!

As an unrelated question... I have an o2 sensor #2 code, should I swap just that one with my parts car, or replace them as a matched pair? The parts car has no codes, so they should be in proper working order.
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