Why won't OBD link with truck?

BILLSR

MEMBER
1995 GMC SONOMA
13,000 MILES

I'm trying to check on the VSS for my truck, and when the scan tool is plugged in to the ALDL, it keeps showing " linking error". We've tried two different scan tools and can't get a code. Any ideas?
Thanks

Monday, January 30th, 2012 AT 6:51 PM

3 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Using OBDI scanner?

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Monday, January 30th, 2012 AT 6:55 PM

BILLSR

MEMBER
2 POSTS

Hi Docfixit,
The scanner tool is my neighbor's and he is at work now so I can't check. He tried 2 different ones and neither will link up. Would a OBDI scanner be used on this model and year? Or does it need a different one. I'm not the mechanic here; I've referred to the Haynes manual and my neighbor who does all the mechanical stuff.
I thought my trani was going out because of a jerking into gear that started recently. He said he had a similar problem with his Dodge and it turned out to be the VSS.

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Monday, January 30th, 2012 AT 7:15 PM

SATURNTECH9

MECHANIC
30,869 POSTS

Just to add this one being a 1995 gm truck does it have the 12 pin obd1 connector or the 16 pin obd1.5 hybrid connector?If it has the hybrid connector a generic scan tool may have trouble reading it. Especially if its a obd2 scanner that may plug in if it has the 16pin connector but wont read.

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Monday, January 30th, 2012 AT 7:42 PM