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#1
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How do I know when my Trans Resistor is Bad?
So my car shifts pretty firmly from gear to gear, but I've been reading about the transmission resistor that seems to go bad, and I'm wondering how to tell if it has failed. So long story short, how do I know if I need to put a new one in (or replace it myself), and what it's purpose is?
Sorry for the Noob question. Thanks, Paul |
#2
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unplug it and measure resistance across the 2 pins on it. should be something around 12 ohms. I think that Trevor could inform you of its function better than I cause I am too lazy to go into detail.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin blk 92' LSL w/ average mods pics here http://s306.photobucket.com/albums/nn277/yourconfused/ Cash68: "Hmm, I wouldn't brag about beating Escorts. That's like saying you tricked a retarded person." |
#3
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Quote:
The resistor is 12 Ohm, you could check the resistance to see. It is used as a voltage dropping resistor, like the old Ballast resistor that was used on Ignition systems. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#4
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If you can lay your hands on a multi meter you can test the resistance which should measure from 9 - 15 ohms and is usually 12 ohms. You will get hard shifts only if the resistance is low, or the resistor is a dead short. The dropping resistor introduces a second series of current pulses applied in parallel with the control signal to solenoid A. These shorter pulses are applied during the off cycles and are timed to check the travel of the armature as it reaches the closed position, thus reducing both shock and noise. These secondary parallel signals in effect, “round off” the closing period and reduce the closing shock. It will be appreciated that increasing the resistance in the circuit, or opening the circuit by omitting the dropping resistor, has two outcomes. Firstly the relative electrical off time is increased, thus increasing the line pressure and therefore makes shifts more abrupt. Importantly as an undesirable second issue, shock loads applied to the valve are increased.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#5
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Quote:
__________________
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin blk 92' LSL w/ average mods pics here http://s306.photobucket.com/albums/nn277/yourconfused/ Cash68: "Hmm, I wouldn't brag about beating Escorts. That's like saying you tricked a retarded person." |
#6
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Thank you Trevor. That is actually what I thought it did. I had a controls class and know a bit about electronics. I put in a shift kit when I rebuilt my transmission last year, so I wasn't sure if the kit was causing it to shift firmly or the resistor. I will pull it out and check it just to be sure, as I have a couple of multimeters.
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