OBD II Connector
So I'm finished with my swap, somewhat, but there is a Check Engine Light.
When I hook up a CAN OBDII machine to it, it doesn't read it. Says "no communication". I also try a Snap-On OBDII scanner, same thing. Says "no communication". I have read that some scanners can't read all vehicles. I'm hoping that's the case, that these two machines just can't read my ECM. But I just want to be sure (for the CA smog test). So, on a 2000 Tacoma, what pinouts are supposed to be used on the OBDII connector? It's only four wires, right? I have an ORS harness, and haven't touched those wires. I looked through my TIS downloads and can't find the reference to it. |
On my wiring diagram for the ECU, the OBD2 connector is in a little box called "data link" or "data connection link" or something along those lines... I don't have it in front of me, otherwise I could tell you exactly. On my 1996, it was 4 wires. But I have heard that later years had more pins, and switched around wires, etc. So I would check into that. Also, 2 of the 4 wires on mine were grounds...which makes very little sense to my simple mind... If there is a ground terminal on the harness somewhere that isn't hooked up, that would do it too.
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Originally Posted by Quick Draw
(Post 51713056)
If there is a ground terminal on the harness somewhere that isn't hooked up, that would do it too.
I found the "data link" on the diagrams and those look to be by the books. There isn't a section for just the OBDII connector to ECU diagram, right? |
So on my diagram, the "Data Link Connector 3" on my 2000 Taco uses pins 4, 5, 7, and 16. But the OBDII ISO 9141-2/KWP2000 says pins 4, 5, 7, 15, and 16 must have metal contacts. According to mine, it is missing a 15. Is that okay?
Pin 4 is chassis ground Pin 5 is signal ground Pin 7 is the ISO 9141-2 K Line Pin 15 is the ISO 9141-2 L Line Pin 16 is the Battery Power Does anyone know if both pins 7 and 15 MUST be used for the reader? EDIT: Okay, I found that pin 15 (L Line) is optional, from the ISO 9141-2 standards. So ... now ... I ... must ... go ... check ... ing ... lines ... a ... gain. That sux. |
you want the obd2 connector on the harness side to match up with what the ewd says.
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Yeah, the unfortunate part is that mine does match up, but the scanners still don't read it. Not sure what else to do. Is there anything I need to do besides just plugging in the scanner?
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you have the right scanner? it has to be the ISO standard. I know mine is the GM or ford version, but I have a 97.
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I'm not sure. One of them is a CAN-OBDII reader, didn't catch the brand. The other one is a Snap-On OBDII reader. It's pretty neat, and you can see it switching the protocols trying to make a connection.
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do you have the key on? right before the truck starts. make sure the pin locations are right for the year ECU you are using, how is the battery?
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I fixed it yesterday. My switched +12V to the E5 connector of the ECU wasn't working. Once I provided power, it is working now.
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