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  #16  
Old 10-23-2007, 11:35 PM
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Patrick,

The resistor or the associated circuit, is in no shape or form involved in a control function in respect of the transmission. In no way is it "responsible for softening shifts by reducing line pressure in the event of a shift," as you suggest.

Please go to my locker and check out the data on Transmission Solenoids:-

http://www.subaru-svx.net/photos/files/Trevor/43638.htm

You state that a number of problems you experienced, i.e. binding and flare issues, were caused by a “resistor failure.” In what way did the resistor fail or become faulty? Cease to pass current due to being open circuit? Short circuit internally, so as to have zero or reduced resistance? Short circuit to ground?

I contend that in your case the new resistor had no specific affect, and that replacing the TPS, and or adjusting the brake band was the key to your fix. be sure that it is absolutely vital when diagnosing faults, to make only a single adjustment at a time, before observing results. Otherwise all is in doubt.
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  #17  
Old 10-24-2007, 01:36 AM
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Trevor-
Manarious asked where Solenoid A is located on the transmission because he already looked at the documentation you have on it and still could not find it. Just a heads up.

And if the resistor "is in no shape or form involved in a control function in respect of the transmission," then why does removing the resistor cause the transmission to shift hard and lose the ability to perform engine braking? Seems to me it must control something in the transmission since without the resistor things bind up and become uncomfortable. Replacing the resistor with a properly functioning one solves these problems.

Honest!
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  #18  
Old 10-24-2007, 02:23 AM
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Nomake,

Solenoid "A" is located within the transmission and comprises part of the valve body assembly. Writing up replacement procedures is a bit beyond my keyboard skills.

Please have a look at the documentation. The resistor is not designed to have a control function as such, but the parallel voltage supplied via the resistor does as a side issue, affect the control of line pressure via solenoid “A”.

If the resistor circuit is broken the line pressure is increased, resulting in harder shifts to be sure. But in effect such a mod. is not a means of control, being in affect a constant modification in respect of the original design parameters. Something not envisaged by the designers, and most certainly not desirable.

By the same token, if a faulty resistor causes an open circuit with the same result, replacing same will return things to normal.

Honestly! Trevor.
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Last edited by Trevor; 10-24-2007 at 02:39 AM.
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  #19  
Old 10-24-2007, 06:23 AM
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Quote:
Originally Posted by Trevor View Post
By the same token, if a faulty resistor causes an open circuit with the same result, replacing same will return things to normal.
I am wondering if this is actually the case. Unfortunately, it's supposed to rain all day and that'll kind of put a hamper on my plans (no garage...).
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  #20  
Old 10-24-2007, 11:15 AM
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Quote:
Originally Posted by Trevor View Post
Patrick,

The resistor or the associated circuit, is in no shape or form involved in a control function in respect of the transmission. In no way is it "responsible for softening shifts by reducing line pressure in the event of a shift," as you suggest.

Please go to my locker and check out the data on Transmission Solenoids:-

http://www.subaru-svx.net/photos/files/Trevor/43638.htm

You state that a number of problems you experienced, i.e. binding and flare issues, were caused by a “resistor failure.” In what way did the resistor fail or become faulty? Cease to pass current due to being open circuit? Short circuit internally, so as to have zero or reduced resistance? Short circuit to ground?

I contend that in your case the new resistor had no specific affect, and that replacing the TPS, and or adjusting the brake band was the key to your fix. be sure that it is absolutely vital when diagnosing faults, to make only a single adjustment at a time, before observing results. Otherwise all is in doubt.
Hi Trevor,
Thanks for setting me straight,

In my case, a brake band adjustment was performed with no effect, then the TPS was set to .5v (from 2.3v), also with no effect, I then swapped the TPS with a new one - no effect. Then replaced the resistor behind the battery. My transmission feels new (it should, it is new)

As I was not scientific in my diagnosis (I did not, for example, revert to the old brake band setting, or go back to my old TPS) I cannot be certain that these other components did not have some small contribution to my problem. However, there was no noticeable impact on my transmissions behavior after each of these steps were completed. And a profound one when I replaced the resistor.


Could you point me to an informative article on the function of the resistor on transmission behaviour? How does it affect shifting abruptness (or lack there of) It is a common modification to remove this resistor to induce firmer shifts, and I can attest that it does just that in a very noticeable way.

Thanks,
Patrick
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Last edited by nextse7en; 10-24-2007 at 11:17 AM.
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  #21  
Old 10-24-2007, 02:55 PM
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Quote:
Originally Posted by nextse7en View Post
Hi Trevor,

Could you point me to an informative article on the function of the resistor on transmission behaviour? How does it affect shifting abruptness (or lack there of) It is a common modification to remove this resistor to induce firmer shifts, and I can attest that it does just that in a very noticeable way.

Thanks,
Patrick
Back track in this thread to my post No. 16, click and my explanation should explain all that is involved.
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  #22  
Old 10-24-2007, 06:22 PM
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Quote:
Originally Posted by Nomake Wan View Post
Removing the resistor will create hard (sometimes jarring) shifts which I can't imagine are good for the transmission and you will lose engine braking in 3rd. Altogether a bad idea.

I thought this would be perfect for an autotranny and the slow shifts just the opposite. I understand we are still in the problem solving mode but honestly, I think if he can make his car shift quicker, it may reduce slippage in between gear shifts. Slippage = heat = Not good for an autotranny (especially a failing one).
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  #23  
Old 02-22-2011, 10:52 PM
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Re: Shifting issues

Quote:
Originally Posted by nextse7en View Post
Hi Trevor,
Thanks for setting me straight,

In my case, a brake band adjustment was performed with no effect, then the TPS was set to .5v (from 2.3v), also with no effect, I then swapped the TPS with a new one - no effect. Then replaced the resistor behind the battery. My transmission feels new (it should, it is new)

As I was not scientific in my diagnosis (I did not, for example, revert to the old brake band setting, or go back to my old TPS) I cannot be certain that these other components did not have some small contribution to my problem. However, there was no noticeable impact on my transmissions behavior after each of these steps were completed. And a profound one when I replaced the resistor.


Could you point me to an informative article on the function of the resistor on transmission behaviour? How does it affect shifting abruptness (or lack there of) It is a common modification to remove this resistor to induce firmer shifts, and I can attest that it does just that in a very noticeable way.

Thanks,
Patrick
Anyone know what this magical resistor behind the battery looks like?!!? any pictures of it floating around here?
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  #24  
Old 02-22-2011, 11:04 PM
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Re: Shifting issues

Quote:
Originally Posted by sd2649 View Post
Anyone know what this magical resistor behind the battery looks like?!!? any pictures of it floating around here?
If you shine a flashlight on the driver's side of the battery, it'll be pretty obvious.
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  #25  
Old 02-22-2011, 11:20 PM
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Re: Shifting issues

on it!,

Edit------------

OK, Is it the 4" long T shaped thing held to the car with 2 bolts and connected to a two wire connector? And why on earth would something effecting the transmission be there :/

So, if I unplug it and my engine flaring between shifts goes away... then I should replace it? I have a donor car with one intact, maybe it works! (update: my "spare" reads 0ohms, so yeah, that aint gonna help me. Hopefully I find the same issue with the one on my daily driver and that is what's causing all my issues)
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Last edited by sd2649; 02-23-2011 at 02:11 AM.
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  #26  
Old 02-23-2011, 02:06 AM
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Re: Shifting issues

I was wondering, has anyone tried using a resistor with a higher ohm rating? like 50ohms or so (stock is around 12-13ohms so I read on the interwebz). I was thinking it MIGHT firm up shifting a bit all the way around????
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Last edited by sd2649; 02-23-2011 at 02:12 AM.
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  #27  
Old 02-23-2011, 10:34 AM
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Re: Shifting issues

I pulled the resistor on my daily driver this morning and it read 0ohms as well. While I had it off, I drove around and sure enough, it shifted super firm on every shift. I will be running by radio shack today to see what I can dig up. Wish me luck!
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  #28  
Old 03-03-2011, 09:04 PM
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Re: Shifting issues

ok, so i started by placing a 50ohm 10watt resistor in there and going for a drive. long story short, i blew a transmission line, yeah, it was pretty hard shifting, lol! after a short walk home and a quick drive in my wifes car to autozone, i slowly drove the svx home. i then put another 50ohm 10 watt resistor in parallel (so, around 25ohms and 20watts) and went off again. i have been driving it this way for about a week now and LOVE it! not too firm or soft. while i was at it, i went ahead and put a power mode switch in too and pretty much leave it on. using cruise control shuts off power mode, so i dont even fiddle with the switch
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