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The Great OBD Challenge!

Old January 9th, 2019, 09:25 AM
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The Great OBD Challenge!

Hello all. I'm hoping for a little help here. I have a 1995 Olds Silhouette. This is the year they were transitioning OBD ports from OBD1 to OBD2. I am aware of the paper clip trick on OBD1 ports to read trouble codes by shorting the "A" and "B" terminals, but mine is different. I have no lead going to the "B" terminal. My OBD plug only has three wires going to it, and one of them is not to the "B" terminal. I have been to every auto parts store and two mechanics now...nobody can figure out how to read the trouble codes with this specific plug. Anybody have a similar experience? Is there any way for me to pull the codes without paying a dealership $100 to do it?

Thank you all in advance.

Cliff
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Old January 9th, 2019, 09:34 AM
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Old January 9th, 2019, 10:13 AM
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Your OBD 1.5 system does not have the diagnostic terminal that lets you jumper the terminals. The only way to read this is with a scan tool that is specifically compatible with OBD 1.5.

http://www.imhdd.ms11.net/OLDS/obd.html
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Old January 9th, 2019, 10:30 AM
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This should be the three wires in your ALDL connector.


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Old January 9th, 2019, 03:37 PM
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Have a '95 Firebird and have had no luck at all trying to retrieve codes. Has the OBD 2 connector and has OBD 1 wiring.
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Old January 9th, 2019, 04:38 PM
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Originally Posted by classicmuscle.442 View Post
Have a '95 Firebird and have had no luck at all trying to retrieve codes. Has the OBD 2 connector and has OBD 1 wiring.
Chevy and related cars (like the F-body) used the 16-pin OBD2 connector for these transition cars. Olds and Buick used the 12-pin OBD1 connector. There are a limited number of scan tools that can read them. Most vendors, especially those selling the low-end scan tools, don't bother to support this limited market.
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