Question about 1995 Chevrolet S-10 CA Edition

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When I plug my scan tool into the computer of my 95 S10 jimmy, there is no communication. I tried replacing the omputer and got the same.

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Okay, what you may have on your hands here is what has become known as an obd1.5 computer setup. Some of the 94's and 95's were made in anticipation of the switch to the obd2 set up. To determine if you fall in to this category locate your vehicle's computer. If it is under your hood in the engine compartment and you have two oxygen sensors and the port for your scanner fits an obd2 scanner then you have an obd2 system and your inability to link is either an electrical issue or something wrong with the computer itself.

If the computer is not in the engine compartment, you have one oxygen sensor, and the port for your scanner is rectangular you have an obd1 system.

If your computer is not in the engine compartment, you have one oxygen sensor and you have an obd2 scanner port you have an obd1.5.

Obd1 systems can be checked with an obd1 reader or much more easily with a paper clip or jumper wire. Just google something to effect of obd1 paper clip method. If there is still no communication once again you more than likely have an issue with your computer or electrical system.

If you have a true obd1.5 system do not fret there is still hope :) Yes there are some obd2 scanners that will work on these and there are some reportedly fancy obd1.5 code readers, however the easiest (and least expensive) way to pull the codes from this system is to use a modified version of the paper clip method. Instead of using your paper clip or jumper wires on terminals A&B, jump terminals 5&6.

Look at your scanner port. Count the terminals on the top row starting from the left. There should be connections in terminals 4, 5, and 6. Connect the jumper to terminals 5 and 6 and turn the key to the 'on' position (without turning the engine over). Your check engine light will flash. Each code will be two digits long and will flash three times (sort of like morse code). The first one will be a 1 and a 2, thus code 12. This code can be overlooked as it is just stating that the computer is being jumped. The codes that follow are the ones you should take note of.

These two digit codes correspond to the two digit obd1 codes. You can find their definitions on any number of websites. I personally prefer the haynes troublecode book though as it includes some make specific information.

Good Luck!

Posted on Nov 06, 2010

  • badx Apr 01, 2011

    incomplete info, most "1.5"s use only 4 and 5 on top and there is no way to pull codes from this configuration, unless, I am told, you have access to a tech 2 reader from the dealer.

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Check the fuses especially any marked ECU, ECM, or PCM. If they are all alright then there must be a problem with one or more of the wires between the computer and the data link connector.

Posted on Apr 25, 2010

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Some scanners will not work,,,u mite have to jump a&b terminal & count the flashing ck engine light,,to get a code or different scanner,,,

Posted on Apr 25, 2010

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if my answer were useful please vote for me

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