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How to identify is ECU is OBD2 or OBD1?

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Old 10-23-2003, 07:59 PM
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Default How to identify is ECU is OBD2 or OBD1?



I am Looking to switch to OBD1 and I seem to find both OBD2 P72 and OBD1 P72 ECU's...Can anyone tell me how to confirm the ECU is a OBD1 P72 94-95 Integra GSR ECU without cracking it open? Are there any no's I should be looking for?

Thanks!
Old 10-23-2003, 08:34 PM
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Default Re: How to identify is ECU is OBD2 or OBD1? (b18c4door)

just look at the plugs. OBD1 has 3 plugs continuous and OBD2A has 3 plugs with a space between 1 of them.
Old 10-23-2003, 08:40 PM
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Default Re: How to identify is ECU is OBD2 or OBD1? (b18c4door)

look for the code 37820-p72-A00 or A01....A02 also?
here's 2 obd1 p72's for example...(notice the plugs)


hope that kinda helps


Modified by iH8RICERZ at 10:01 PM 10/23/2003
Old 10-24-2003, 03:55 AM
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Thanks to the both of ya. That really helps out., I didnt realize the plugs were fifferent, but its very obvious when you guys pointed it out! Thanks!
Old 10-24-2003, 04:11 AM
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Default Re: How to identify is ECU is OBD2 or OBD1? (iH8RICERZ)

nice pics!

p72 obd1 cracked open



p28 w/chip plugs



just in case somebody tries to sell you a chipped 28 w/no labels and stating that is
a p72 obd1
they tried that stunt on me.
Old 10-24-2003, 04:46 AM
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obd1 has 3 plug slots


obd2 has 4 plug slots with 1 slot empty having no pins
Old 10-24-2003, 06:56 AM
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big reds - awesome pics, brau!

I hate people who try to rip ya off...Thats why I am so nervous to buy online.... Thanks!
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