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  #1  
Old 08-28-2007, 06:41 AM
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Speed Sensors Questions?

Is it somehow possible to take the pulse signal form the rear of the USA AWD auto trans and feed it into the speed sensor on the differential?

In other words is the pulse from the VSS1 the same as for the VSS2?

Thanks,

John
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  #2  
Old 08-28-2007, 07:46 AM
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If you could do that I don't think you would want to. The TCU looks for differences in the sensors to adjust the AWD system.

What's the problem with your front sensor?
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  #3  
Old 08-28-2007, 10:30 AM
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Quote:
Originally Posted by Hocrest
If you could do that I don't think you would want to. The TCU looks for differences in the sensors to adjust the AWD system.

What's the problem with your front sensor?
The front sensor isn't working correctly, I think the gear is slipping in the diferential. I have another thread going on this subject. Here
Right now I just want the SVX to run and IF it is possible to get the signal from the VSS1 into the VSS2 then I would do it.

I do not really need the AWD right now.
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  #4  
Old 09-04-2007, 04:30 AM
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Any thoughts on this?
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  #5  
Old 09-04-2007, 06:35 AM
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Quote:
Originally Posted by svx_commuter View Post
Is it somehow possible to take the pulse signal form the rear of the USA AWD auto trans and feed it into the speed sensor on the differential?

In other words is the pulse from the VSS1 the same as for the VSS2?

Thanks,

John
John, I'm not an expert, but I don't think this will work.

In the UK cars, both sensors are inside the gearbox[no, not in the differential, in the gearbox], one at the back same as yours, one inside reading the front drive.

In the JDM cars and the US cars, you have a different system, you both use this VSS2 sensor beside the front diff dipstick.

The two speed sensors in the UK cars are the same type. The sensor in the US type for VSS2 gives out a different signal. SFAIK it sends a square wave pulse of maybe 5V to the TCU. This implies that the TCUs between the US type and the UK type are fundamentally different inside, because they are interpreting a different signal.

So my guess is you possibly could do what you suggest with the UK type internal VSS2, but it would be meaningless with the front differential driven one that you have.

Sorry for the bad news, but that is how I see it.

Joe
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Last edited by svxistentialist; 09-04-2007 at 06:45 AM.
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  #6  
Old 09-04-2007, 02:29 PM
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short answer... not without ****ing stuff up. What really needs to happen is to tear the tranny out and inspect the gears inside of the diff... OR take the speed sensor out of the diff and gently use a screw driver to turn the drive shaft for the sensor... if it slips... there is your problem... if not.... its not your probem... simplicity is usually the best troubleshooting tool

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  #7  
Old 09-04-2007, 06:37 PM
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Hi Joe, Thanks for the postings

Hello Tom......... So what is involved in doing this work? I am thinking I may have to do this work myself and I am trying to decide. What have you seen broken in there? gear? key for the gear? How dried out is the seal at the top of the shaft? Thanks
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  #8  
Old 09-04-2007, 06:43 PM
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I have never seen one broken before... Only thing I have heard of crapping out is the drive shaft that runs to the sensor from the gears. which still requires the pull of the diff to fix.... I'd say pull the stock sensor and try and turn it with a screw driver lightly before you go passing the idea that you bought a faulty sensor

Tom
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  #9  
Old 09-05-2007, 05:16 AM
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The drive shaft inside the diff breaks? That is a metal shaft? What part of the shaft breaks?

I am not saying the sensor is bad. I am saying that it can be improved. The one I have does work. I am saying that this problem of pulling the diff can be avoided with a sensor that has better lube inside it.

Do you think it is possible to pull a good working sensor from any SVX and see how easy it is to turn the sensor shaft? At some point in the life of the sensor the grease is going to stop working. If I did that last year, pull the sensor and check it, I could have replaced the sensor AND not have to pull the diff apart.

Thanks for your post Tom. It is always great to get first hand experience with a problem.
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  #10  
Old 09-06-2007, 04:32 AM
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Tom, I got a screw driver in the slot and the shaft insdie the diff did not turn. The engine was still warm and the problem I had was when th engine was cold. I have to check it again when the engine is cold.
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  #11  
Old 09-06-2007, 11:34 AM
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Okay I just checked the shaft in the diff and it's cold and I can't turn it.......so maybe I have that corrosion problem on the contacts in the plug.......hmmmmm I clean it and put the VSS2 back inthis weekend.

How much torque can that shaft in the diff take? 20in-lbs? Anybody know?
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  #12  
Old 09-06-2007, 01:51 PM
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only one way go find out... and I wouldn't do it I would say make sure your wiring is proper before any further steps... obviously your gears are ok and the shaft is ok... with a new sensor thats good too... now you need to check the wiring and all connections in it

Tom
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  #13  
Old 09-06-2007, 06:49 PM
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Try taking a long flathead screwdriver and putting it in the slot. Mark the screwdriver on the handle with whiteout and drive the car a little bit. (Please do this with caution as the hood will be up, if you have a long enough screwdriver you will be able to see it spin) If your screwdriver does not spin there is a problem. In my experience the shaft didn't go bad the gear on the end of it broke into pieces from repeatedly jumping teeth, thus crushing the brittle plastic. To check the sensor just have someone sit in the car with the ignition on and try to spin it by hand, spin it both ways as only one direction will read on the speedo. If the gear is broken there is no way to fix it but pulling the diff from the engine, and no you can't go in from the output for the axle
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