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Old 10-29-2012, 10:55 PM   #1
Miho1269
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P12 ecu OBD swap Q's

Over the weekend i decided to make the 2 hour trip to the nearest PNP to get a passenger side mirror, find a few misc. parts and price out leather seats from a cd5. During my little adventure i came across a 4G prelude S so i proceeded to pull the P12. On the way home we stopped to get gas and i was so excited to try it out i started to swap the ecu only to find out i had gotten an OBD2 P12 instead of an OBD1 which is what my 92' LX is. My questions are.

Would an OBD1 to OBD2 conversion harness work?
Does the f22a1 from the slightly newer prelude have any sensors that my cb doesnt that would cause it to throw a code?
Am i actually going to be able to physically feel the difference "10 hp gain"

Thanks in advance.

Last edited by Miho1269; 10-29-2012 at 11:22 PM. Reason: wrong obd #
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Old 10-29-2012, 10:57 PM   #2
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Originally Posted by Miho1269 View Post
Over the weekend i decided to make the 2 hour trip to the nearest PNP to get a passenger side mirror, find a few misc. parts and price out leather seats from a cd5. During my little adventure i came across a 4G prelude S so i proceeded to pull the P12. On the way home we stopped to get gas and i was so excited to try it out i started to swap the ecu only to find out i had gotten an OBD1 P12 instead of an OBD0 which is what my 92' LX is. My questions are.

Would an OBD0 to OBD1 conversion harness work?
Does the f22a1 from the slightly newer prelude have any sensors that my cb doesnt that would cause it to throw a code?
Am i actually going to be able to physically feel the difference "10 hp gain"

Thanks in advance.
CB7's are obd1....
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Old 10-29-2012, 11:19 PM   #3
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Did the 4th gen 'ludes switch to obd2 and if they did then i have the same questions but obd1 to obd2 sorry bout that.
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Old 10-29-2012, 11:24 PM   #4
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Did the 4th gen 'ludes switch to obd2 and if they did then i have the same questions but obd1 to obd2 sorry bout that.
are you you're not mixing up the ecu and tcu?
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Old 10-29-2012, 11:31 PM   #5
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are you you're not mixing up the ecu and tcu?
Both are 5 speed and both are located in the same spot on the car and it says p12 on the ecu from the prelude
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Old 10-29-2012, 11:33 PM   #6
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Im going to run out to my car and take a pic of the p12 for you i would take one of the accords but in sure u know what that looks like. im gonna be so mad if this is completely off the wall wrong.
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Old 10-29-2012, 11:42 PM   #7
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My guess is you got a P12 out of a '96 Prelude S. That's the one year that the 4th generation Preludes were OBD2.
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Old 10-29-2012, 11:45 PM   #8
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Yes, it's likely an OBD2 P12. Unfortunately... there's really nothing you can do. You probably COULD convert to OBD2, but for 10hp it's really not worth the effort.
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Old 10-29-2012, 11:51 PM   #9
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This one came out blurred but it says p12-A20
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Old 10-29-2012, 11:54 PM   #10
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Yes, it's likely an OBD2 P12. Unfortunately... there's really nothing you can do. You probably COULD convert to OBD2, but for 10hp it's really not worth the effort.
Well with my luck that doesnt really surprise me. thanks for the help guys.
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Old 10-29-2012, 11:54 PM   #11
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You have the rare '96 P12 ECU. It's worth...nothing. Maybe some one with a '96-'97 F22B2/6 could use it, but I'm really talking out of my ass there. From a performance standpoint the F22B2 uses the 3A (F22A1/4) camshaft so it's most closely related. The F22B6 uses the 4A (F22A6) camshaft so it's less of a fit. Not to mention it only came in automatic cars which would be a problem if that ECU is for a manual transmission. Sorry, it doesn't help you.
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Old 10-29-2012, 11:57 PM   #12
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So the moral of the story is, that ecu won't work, there is no reasonable hope to make it work.
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Old 10-30-2012, 12:05 AM   #13
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So the moral of the story is, that ecu won't work, there is no reasonable hope to make it work.
And make sure you have the right year ecu before u pay for a $50 paperweight
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Old 10-30-2012, 12:19 AM   #14
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OP, can you not take it back? The PNP i went to gave you X amount of days to take back things but will only give you store credit instead of a refund.
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Old 10-30-2012, 01:34 AM   #15
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OP, can you not take it back? The PNP i went to gave you X amount of days to take back things but will only give you store credit instead of a refund.
He probably can't

its very rare for a PNP to offer a return policy.
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Old 10-30-2012, 12:16 PM   #16
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In omaha theres 2 PnP a bigger one thats really nice and a smaller one thats way down in the getto of omaha and in it had it said no returns all over it but i might try and take it to the bigger one and see what they say
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