90 silverado speed signal

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70sguy

Member - Posts: 5

Joined: August 03, 2016

Location: Ohio, United States

Posted: August 13, 2016 at 12:17 PM / IP Logged

I am wondering If anyone knows the location and color for the vehicle speed sensor on a 90 silverado. Also if you know where the reverse signal wire color and location. I have searched all over the net and I find nothing. If the only place to tie in is at the speed sensor itself, then which wire is it?

Thanks

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lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 13, 2016 at 8:50 PM / IP Logged

Here is the 91 Suburban Diagram. C11 of the DRAC will go to the A10 terminal on the 24 pin connector of the ECM (curcuit #437, wire color-brown)

90 silverado speed signal -- posted image.

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70sguy

Member - Posts: 5

Joined: August 03, 2016

Location: Ohio, United States

Posted: August 14, 2016 at 1:24 AM / IP Logged

That will help with the reverse wire, but the 1990 didn't have the DRAC. I wonder if I can tie in right at the VSS. It has 2 wires and is located at the tail housing of the transmission. I just don't know which wire to tie into. I am guessing one of the wires is ground and the other is signal? I guess maybe if I check each one for continuity to the frame to determine which is ground? Can anyone confirm this?

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lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 14, 2016 at 2:11 PM / IP Logged

If no DRAC and two wire then one is ground and the other is AC singnal. Some 90's had a DRAC some didn't. Should be able to get it at PCM also.

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lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: August 14, 2016 at 2:23 PM / IP Logged

Some good info here at this link.

http://ck5.com/forums/threads/end-all-post-for-drac-vss-yeah-right.124012/

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Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.