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Great thread!!
I left this thread here in the forum but also copied it and made it a Wiki so maybe it will make it easier to find one or the other when people are searching.
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thanks guys. this info took a lot of time, trial and error, along with multiple junkyard trips. i have to admit that when i got my first truck (the 1990) and could not find either a maf or the ecm on a tight college budget i started looking at the differences between the different years and found that it was surprisingly very little. after getting the 1992 and looking it over i was able to further solidify what i already discovered. what topped the cake was my 1994 parts truck. just that one swapped wire. at first i thought that there was more but after going to the yards and tracing some of the harnesses and dissecting them i found out that that was it. again i was able to experiment a lot over my summer vacations, take tons of trips to the junkyards from Redding to Sacramento and just really read up on this site in particular. sense i got so much info from this site it was time to give something back. i would spend hours just reading over the threads and using what i learned to keep my trucks running.
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Masters Degree
Array
finalfighter, what are the major differences between the OBD1 harness and the 1996 OBD2 harness besides the downstream O2 sensor and OBD port?
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If the truck is a 1996 model AND manufactured in 1996 it will have an obd2 data port regardless of it being federal or cal emission standard. This harness has different style of connectors going into the ecm and this info cant be used on them. i have only ran across one of these. also they use a different throttle body motor setup than the trucks manufactured from 1989-1995 with FEDERAL emissions, and trucks from 1990-1993 with cal emissions. the CAL emission trucks and FEDERAL from 1990-1993 all used the same throttle body idle control motor setup and the 1994-1996 trucks with federal emissions use the same throttle body idle control as the 1990-1993 cal and federal. the 1994-1996 cal emission trucks manufactured from 1993-1995 use the same throttle body as the trucks manufactured in 1996. they do not have an obd2 port. they use the obd1 style. also there harness has different plugs going into the ecm. i cant remember if they are the same as the ones manufactured in 1996 with the obd2 data port because they are so rare and i have only found one. Cal emission trucks from 1994-1996 are sort of rare too so you will almost always run into the 1994-1996 trucks with a federal style ecm.
this seems really confusing but i hope it answers your question.
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Masters Degree
Array
Thanks. I follow you, I deal with OBD0-1-2 and CAL/FED differences all day long.
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Could we swap in a turbo evo car ecm into our truck?
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