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Locating VSS wire on '86 GL


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15 replies to this topic

#1 hellosubaru

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Posted 30 July 2013 - 07:40 PM

I'm trying to find the VSS wire to hook up on my '86 GL carb. I have the cluster pulled currently, but I'm not sure which wire it is. I see posts saying it's marked as the reed switch, but I'm not finding any such markings, and I don't have the EA82 wiring diagrams. Could someone point out the correct connector and wire color (picture would be a bonus!).

 

From the few posts I found while searching, I couldn't find anything descriptive enough for the EA82.

 

Thank you,

-Jason


Edited by hellosubaru, 30 July 2013 - 07:50 PM.


#2 hellosubaru

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Posted 30 July 2013 - 09:21 PM

So, I'm hoping I did this correctly. I found I wiring diagram, and it looks like the VSS/reed wire I want to tap into is pin 4, Yellow/Red on a round connector on the back of the instrument cluster. Is this correct? I tapped into this, but it is not producing a square wave like i think it would.



#3 Gloyale

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Posted 31 July 2013 - 11:16 AM

Way up under the dash. In the far drivers side corner up towards we're the harness goes through the firewall, there is a 2 pole "t" connector with a yellow/red and a black wire. Black connector. This is the cruise optional hookup for the vss. Connect the black wire to ground. The yellow red is the vss signal.

You can get it at the dash like you described. But I think you need to give the reed switch with that ground.

#4 hellosubaru

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Posted 31 July 2013 - 11:22 AM

Way up under the dash. In the far drivers side corner up towards we're the harness goes through the firewall, there is a 2 pole "t" connector with a yellow/red and a black wire. Black connector. This is the cruise optional hookup for the vss. Connect the black wire to ground. The yellow red is the vss signal.

You can get it at the dash like you described. But I think you need to give the reed switch with that ground.

 

This is for the EA82, correct? So it sounds like I tapped the wrong wire. I will hunt for this connector after work today and let you guys know if I can find it.

 

Thank you.



#5 Gloyale

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Posted 31 July 2013 - 11:51 AM

This is for the EA82, correct? So it sounds like I tapped the wrong wire. I will hunt for this connector after work today and let you guys know if I can find it.


Thank you.


I'll bet you have the right wire, just no ground to the vss unit since the carb doesn't need it. (FI car would have ground to it already)


The cruise connector is just another acces point and let's you install the ground without ripping apart the dash.

#6 hellosubaru

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Posted 31 July 2013 - 11:56 AM

Awesome, thanks for the help. I'm excited to find this connector after work! I'll keep you guys posted and post a pic if possible.



#7 hellosubaru

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Posted 31 July 2013 - 08:44 PM

So, I looked for 5-10 minutes or so for the black 2-wire connector behind the cluster, but couldn't find it. Is it up under the dash somewhere?

 

Btw, this is the wire I tapped for the VSS signal:

 



#8 hellosubaru

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Posted 31 July 2013 - 10:11 PM

I scrounged around a little more under the dash, and I found this connector. It's not black, but the wire colors sound like they are the correct color. Is this what I'm looking for? The connector was taped down to the wire loom up by the firewall under the dash on the driver side.

 

IMG_20130731_200315_zpsb67c3f8f.jpg


Edited by hellosubaru, 31 July 2013 - 10:43 PM.


#9 Gloyale

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Posted 01 August 2013 - 10:38 AM

Yup thats it I do believe.

 

labeled as connector F69, car speed sensor in the FSM.

 

Looks like you had the right wire up at the dash connector too.

 

It's Yellow red at the dash, but changes to Yellow/Green at the big main dash connector, before going to the ECU, and to the Cruise hookup noted above.


Edited by Gloyale, 01 August 2013 - 10:48 AM.


#10 hellosubaru

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Posted 03 August 2013 - 01:52 PM

I tried grounding that connector I posted a picture of above, but no dice. Any other suggestions or ideas?

 

I'm also getting no CEL for a missing VSS sensor. EJ20 ECU.

 

Thanks,

-Jason


Edited by hellosubaru, 03 August 2013 - 01:58 PM.


#11 Gloyale

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Posted 05 August 2013 - 01:00 PM

I tried grounding that connector I posted a picture of above, but no dice. Any other suggestions or ideas?

 

I'm also getting no CEL for a missing VSS sensor. EJ20 ECU.

 

Thanks,

-Jason

 

Ground to the black wire,

 

VSS to the Yellow/Green



#12 hellosubaru

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Posted 05 August 2013 - 07:33 PM

Ground to the black wire,

 

VSS to the Yellow/Green

 

Yes, this is exactly what I did. I ran a ground wire to the black wire on the connector, and ran a wire from the VSS wire on the ECU to the yellow wire on the connector.

 

Thanks again,

-Jason



#13 Gloyale

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Posted 06 August 2013 - 11:17 AM


 

I'm also getting no CEL for a missing VSS sensor. EJ20 ECU.

 

So.....if you aren't getting a CEL, then how do you know it's not sending the signal?



#14 hellosubaru

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Posted 06 August 2013 - 11:21 AM

So.....if you aren't getting a CEL, then how do you know it's not sending the signal?

I've hooked up a digital square wave meter to the VSS wire to the ECU, and I get no pulse. Plus, the launch control feature of the ECU doesn't disable. The launch control feature disables with VSS sees > 2mph from the VSS.

 

Thanks for sticking with me on this.

-Jason



#15 Gloyale

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Posted 06 August 2013 - 11:57 AM

I've hooked up a digital square wave meter to the VSS wire to the ECU, and I get no pulse. Plus, the launch control feature of the ECU doesn't disable. The launch control feature disables with VSS sees > 2mph from the VSS.

 

Thanks for sticking with me on this.

-Jason

 

Did you do this while driving, with the VSS wire hooked up to the car?  The signal goes from the dash, to the ECU.....not from the ECU.  Still seems like if wasn't working you'd have a CEL for it.



#16 hellosubaru

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Posted 06 August 2013 - 12:09 PM

Yes, I understand the signal goes from the dash to the ECU. I performed the signal test while driving the car. I do agree it seems really weird that there is no VSS code.

Does anyone know if the signal from the reed switch is a square wave? If it's not, then that's why I wouldn't see anything on the meter.

-Jason




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