OBD0 or OBD1?
OBD0 or OBD1?
Re: OBD0 or OBD1?
12-11-2008, 01:32 PM
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Re: OBD0 or OBD1?
Actually you're both right...kinda. The 90-93 Accords (PT3 ECU if I remember) had OBD1 connectors on the ECU, but the ECU itself used OBD0-era electronics hardware inside. It wasn't the same hardware family as the 92+ Honda ECUs that are usually called OBD1. So it isn't really an OBD1 Honda ECU, but rather a pre-OBD (OBD0) ECU with OBD1 connectors. It's hard to make generalizations because there really weren't OBD standards until OBD2 came out.
I'm not sure what the pinout is on that Accord, but be careful. Because it isn't the same hardware family as the other OBD1 ECUs, the pinout might be completely different even though it has the same connectors. Everything after 1992 really has the same pinout, Accord, Prelude, Civic, Integra, etc., because it's all the same hardware family internally. It's kind of the opposite of the Civic PR3/PW0 OBD0 ECUs, which had OBD0 connectors but very close to OBD1 internals. Fun but completely useless trivia, I know.
I'm just saying you should check the pinout with a factory manual before you plug a later model ECU in there and potentially fry something. You can probably find an answer if you look around, just be cautious until you can verify that one way or another.
The good thing is that if you find the pinout is different, you should be able to re-pin the connectors so you end up with a 92+ pinout in the end. That is, if I'm remembering all of this correctly.
I'm not sure what the pinout is on that Accord, but be careful. Because it isn't the same hardware family as the other OBD1 ECUs, the pinout might be completely different even though it has the same connectors. Everything after 1992 really has the same pinout, Accord, Prelude, Civic, Integra, etc., because it's all the same hardware family internally. It's kind of the opposite of the Civic PR3/PW0 OBD0 ECUs, which had OBD0 connectors but very close to OBD1 internals. Fun but completely useless trivia, I know.
I'm just saying you should check the pinout with a factory manual before you plug a later model ECU in there and potentially fry something. You can probably find an answer if you look around, just be cautious until you can verify that one way or another.
The good thing is that if you find the pinout is different, you should be able to re-pin the connectors so you end up with a 92+ pinout in the end. That is, if I'm remembering all of this correctly.
Last edited by Fabrik8; 12-11-2008 at 01:39 PM.
12-11-2008, 09:15 PM
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Re: OBD0 or OBD1?
Yes useless trivia, but as far as the harness goes he should be able to keep the stock one and just run a couple extra wires (one for vtec of course). The old accord ecu shouldn't be a problem seeing as how it would be replaced with a h22 ecu. Never seen any problems with guys on cb7tuner.com frying their ecu after doing a swap in a 90-91 accord but it could be possible. I'd just keep the stock harness and run the extra wires. Just my .02
12-11-2008, 10:48 PM
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Re: OBD0 or OBD1?
That's good info, I've never messed with old Accords. So you're verifying that the pinout of the 89-91 Accords is the same as the 92+ OBD1 ECUs?
12-12-2008, 06:57 AM
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Re: OBD0 or OBD1?
Prob just 90-91 then, cause 89 was still the previous generation, lx/dx were carbed A series, LXi and SEi were EFI but still A series.