Just bought a Blazer and i need help

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Sep 19, 2020 | 09:40 AM

#11

Justin Willis

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Quote:

Originally Posted by GeorgeLG

First you need to know what type of system that you have. There are three different systems in a 95. The first system, the computer is located behind the dash and is interfaced using an 12 pin OBD I assembly line data link connector. This system is completely OBD I and codes can be retrieved by jumping the pins. The second system, the computer is located behind the dash, and is interfaced with a 16 pin OBD II style Diagnostic Link Connector. This system is OBD "1.5", and requires a special scanner to retrieve the codes. The third system has the computer located on the passenger side fender, above the coolant reservoir, and uses a 16 pin OBD II style connector. This system is OBD II, and codes can be retrieved with a generic OBD II scanner. I have seen comments that these rules may not be 100% accurate for every truck.

I seem to remember some Actron scanners capable of scanning a 1.5 system but I think that they were around $300 with the connector adapter. Maybe some one here has some better info for you regarding the cheapest way to get a 1.5 system scanned as I have never had to solve this problem.

George

So mine is a OBD II my computer is above the coolant reservoir.

Sep 19, 2020 | 10:32 AM

#12

GeorgeLG

BF Veteran

Joined: Jan 2007

Posts: 4,645

From: Florida

Well that's not what I was expecting to hear. I have read that those rules can be mixed up on some vehicles during that transition year. Is there an ODB certification sticker anywhere in the engine bay (ODB I vs II)? Was an engine swap ever done with that truck?

With the engine off, go to the ODB socket under the dash and measure the voltage from pin 16 to pin 4 and from 16 to 5. Watch it for a while and see if its stable.

George

Last edited by GeorgeLG; Sep 19, 2020 at 10:54 AM.