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> How to use od1 to ob2, need help and if nobody knows learn to do it
post Feb 21, 2021 - 6:59 PM
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Joined Mar 4, '18
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So on my 94 Celica has od1. For those who don't know 94-95 have od1 ports, it's not until 96 that ob2 became a standard in all vehicles that are sold in the US. (Probably everywhere else too, not sure).
So here is my dilemma I have a snap-off solus scan tool that reads od2 which I use for work. I also have an adapter that supposedly connects Toyota ob1 to ob2. I say this cause the adapter doesn't plug last time I tried it, maybe I am not putting in enough force. So regardless of the scanner, I want to know if anybody has done it successfully. If so how were you able to accomplish it? Did it need an external ground or additional power through the cigarette outlet? Any info will be appreciated.
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post Jul 1, 2022 - 7:35 PM
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Joined Dec 4, '20
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First off, let's clear up a few terms. It's OBD1 and OBD2, which stand for On-Board Diagnostics. OBD1 was implemented some time in the 80's and was used through 1995, when OBD2 became a federal mandate for all vehicles 1996-present sold in the US.

OBD1 cars, at least Toyotas, don't have an OBD1 plug per say. You use the Diagnostics connector under the hood. Maybe you're calling that the OBD1 plug? It's designed to short specific terminals which put it into diagnostic mode, then you watch the number of flashes on the instrument cluster. These flash pairings create a 2-digit code that you decipher from a chart. Yea, it's a bit more effort than OBD2 diagnostics.

One interesting thing I read somewhere is that certain Toyota/Lexus models from 89-95 also provide live data streams of certain sensors through this port. I tried connecting a scan tool with the OBD1 adapter hoping to pick up this live data once, but didn't get anywhere. The scan tool wouldn't even recognize the vehicle/ECU. Not having enough experience with OBD1 systems, I wasn't able to get anywhere unfortunately. Most of the guys that worked on these back in the day are long retired and out of the game by now, so it might be tricky getting any help.

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