My 1995 Blazer is apparently one of the OBD 1.5 versions: it has the 16-pin connector with pins in positions 2, 4, 5, 9, 13, and 16, but the emissions sticker doesn't say OBDII (though the fine print says "OBD1 Certified"), and it was built in August 1994, suggesting it was well before the OBDII switch.

What do I need in the way of a code reader? The closest chain auto parts store is a 50-mile drive away...

 

You need a scan tool capable of reading the OBD1.5 system. It isn't fully OBD1 nor is it OBD2...

 

Yeah, I know, but as I look around the net, I can't seem to find a definitive recommendation as to a specific device. The AutoEnginuity scanner seems to indicate it's not capable of it.

OBD-I scanners all seem to have the wrong plug on it, which makes sense. Wiring up an adapter cable is not beyond me, assuming I can get the connectors somewhere.

Anyone have any specific devices they can pass along that work well? I'm not wild about spending a couple of hundred bucks just to see.

 

The AutoXray AXR2500 claims to handle 12- and 16-pin ALDL as well as OBDII on GM vehicles. Anyone have experience with it? It's available online for $150 or so, and that seems like a reasonable deal.

 

I can only vouch for my EZscan 6000 from them. I lie to it about the year of the vehicle in that situation and I get results.

 

In discussions on which one is installed, I see mention of a computer being mounted to the engine coolant bottle being a sign of OBD-II. Is this what they're talking about?

 

Yeah that's the one. My 95 Jimmy is OBD 1.5 and the computer is in the pass side kick panel. I used an AutoXray (don't know which one) but had to buy a specific cable to be able to use it. It's on their website. If you're not sure if it's OBDII next time you're at the auto parts store have them hook it up to their handheld scanner and see if it reads.

 

Was in the closest AutoZone today buying an A/C compressor cycling switch, and asked them to hook up their OBDII scanner. The guy got no stored codes out of it, but said it was definitely an OBDII truck because the scanner would have complained if it wasn't. Is he right? If so, how'd I wind up with an early build 1995 truck with OBDII? Weird.

 

I have a 95 S-10 Blazer with OBD I ECM computer under the hood and OBD II connecter under the dash. this was one of GM's stupid transitions from OBD I to OBD II.The U380 tester does not work! The ACTRON OBD II pocket scan CP9125 from Auto Zone DOES WORK! Will not work for OBD II vehicles. Cycling the key on and off does help! hope this helps!

ROD