obd2 m52 swap problems.

[87e30]

in reading this thread(what you posted above), i don't know how you pulled your codes. if you have a peake analyzer or equivalent, i assume you would have done a fault code reset. if you did the stomp test, i don't think disconnecting the battery will necessarily reset the codes stored in your ecu. in most(if not all) cases, you need to reset the codes to make them go away. the first time i pulled my codes with a peake, i had injector #1 failure. i reset them with the analyzer, the code went away never to come back.

Does the reset on the peak tool not actually do anything for obd2 cars?

Was your car running like SHIT with the code on, then once reset the car ran fine?

Very interesting.

[matt]

1) There is no stomp test for OBD2 cars. You have to have a peake or generic OBD2 scanner. (with a generic OBD2 port of some kind)

2) Reseting the fault codes will only make the car run right if the only thing making the car NOT run right was a limp mode.

3) Pulling the ECU connector will clear OBD1 codes but will not clear OBD2 codes.

[87e30]

1) There is no stomp test for OBD2 cars. You have to have a peake or generic OBD2 scanner. (with a generic OBD2 port of some kind)

2) Reseting the fault codes will only make the car run right if the only thing making the car NOT run right was a limp mode.

3) Pulling the ECU connector will clear OBD1 codes but will not clear OBD2 codes.

My check engine light doesn't work. I've been using a Peake tool, I reset once, and re-drove, and then re-pulled the codes.

A pretty knowledgeable guy on bimmerforums told me to just pop open the ECU case, he thinks I fried it. I've kind of had this hunch since day one.

So I'll pop open the case, if it's not fried then I'll trace the wiring.

[matt]

Well, maybe that's it. The only things I've ever seen kill an ECU are water damage and connecting power backwards.

[87e30]

Well, maybe that's it. The only things I've ever seen kill an ECU are water damage and connecting power backwards.

Well I did hook a ground up to the power line... Is that considered backwards? I was under the impression that it was, but I'm really not sure how it all works to be quite honest.

[MaloventEvil]

Well I did hook a ground up to the power line... Is that considered backwards?

yes. :( pull it to be sure.

[evil_twin]

Check the pins that connect to the ecu computer itself. I've seen those break before.

[BlUe E30]

cant clear OBD2 codes with the 16 pin have to go through the 20 pin

[87e30]

cant clear OBD2 codes with the 16 pin have to go through the 20 pin

The 20 pin is the large round connector, right? That's the only one I have, I do not have the smaller interior connection in my car.


Thanks for the help guys, I'll check over the ECU tomorrow.

[BlUe E30]

yes then your fine, didnt know if somehow you put the OBD2 connector in there with the swap. good luck, if it is fried you looking for a new dme, key, and driveaway protection module?

[matt]

It's perfectly possible to clear and read codes through the OBD2 port. (If you wire one in properly) Otherwise what's the point?

[87e30]

yes then your fine, didnt know if somehow you put the OBD2 connector in there with the swap. good luck, if it is fried you looking for a new dme, key, and driveaway protection module?

I have another ECU already. I think I will just take it and my existing EWS module into a local BMW shop that can align them - allowing a new DME to work with the current EWS. (Just like you'd do if you had a real obd2 e36)

It's perfectly possible to clear and read codes through the OBD2 port. (If you wire one in properly) Otherwise what's the point?

Awesome. Yeah, it should be working properly based on what the guy told me when I bought the harness. I just had to cut one wire off of it and hook it up to 12v to power the code reader.

[BlUe E30]

because on bmws up until the 2000's they had a 20 pin and a 16 pin the 20 pin was the one that you used to clear and read all codes, the 16 pin only allowed you to read emissions problems as mandated by the US government. if he everything from the original OBD2 keeping it OBD2 (which i didnt know if he did or not) you would have to read it through the 20 pin. and you had to cut off the park neutral saftey switch wire. and also can was on all cars not just automatics.

[matt]

No no no no.

The port in the car allows you to talk to the DME and EGS only. The one under the hood lets you talk to the other modules in the car.

The thing is, once you put the motor in an e30, you don't have any of those other modules to talk to. All you need is one wire connected between each daig port and the ECU, plus power and ground at each, and you can do whatever you want to the ECU.

BTW, EWS alignment may not work if you don't have the EWS wired in correctly/completely.

[etxxz]

his ews works because he can start up the car. what may be a problem is a dealer aligning the DME/KEY/EWSII if you don't own the car (VIN) all your stuff came from. I had the same problem so if i loose my key, im screwed. i would have to pay $200 to bimmerworld to remove the ews.. which is what the dealer would charge anyways for a key.

have you opened the dme already?