DIY: In depth M52/S52 OBD2 swap

[Mr.SWISS]

Did it have the one with the angled top on it? That's the setup I really wanted to go with but the ix booster does fine I have no complaints.

I would like to know your feedback on it when you get going.

[mtlbloodshot]

Did it have the one with the angled top on it? That's the setup I really wanted to go with but the ix booster does fine I have no complaints.

I would like to know your feedback on it when you get going.

Yah thats one that comes stock on the Audi MC. I will let you know my feedback when everything is done. Here's a pic I found

[Boise]

How did you wire up the brown top e30 coolant temp sensor? My understanding (and I could be wrong) is that the OBD2 harnesses use one temp sensor that has both readings for the cluster and DME, hence the 4 wires going to the OBD2 temp sensor. Did you splice off one of those wires to the e30 brown top sensor?

[craiggroves91]

How did you wire up the brown top e30 coolant temp sensor? My understanding (and I could be wrong) is that the OBD2 harnesses use one temp sensor that has both readings for the cluster and DME, hence the 4 wires going to the OBD2 temp sensor. Did you splice off one of those wires to the e30 brown top sensor?

You'll have to have a wiring guy answer that. I sent my harness in to have it modified.

[Mr.SWISS]

How did you wire up the brown top e30 coolant temp sensor? My understanding (and I could be wrong) is that the OBD2 harnesses use one temp sensor that has both readings for the cluster and DME, hence the 4 wires going to the OBD2 temp sensor. Did you splice off one of those wires to the e30 brown top sensor?

If you search, you will find the answer in one of my wiring threads. IIRC it was a black w/ yellow stripe but it was a while ago.

[Jezza]

How did you wire up the brown top e30 coolant temp sensor? My understanding (and I could be wrong) is that the OBD2 harnesses use one temp sensor that has both readings for the cluster and DME, hence the 4 wires going to the OBD2 temp sensor. Did you splice off one of those wires to the e30 brown top sensor?

Brown/Violet and Brown/Yellow will be spliced into the brown top connector. Leave the other two in the original sensor.

[328ijunkie]

^ This but you only need brn purple.

[Jezza]

Yes forgot about that!

[Boise]

Sweet, thanks guys.

[328ijunkie]

What works well is the reverse light harness (that you dont need). :P

[mtlbloodshot]

Concerning the reverse lights, the wire that goes back towards the transmission tunnel with the O2 sensor wire is not needed?

[Mr.SWISS]

Concerning the reverse lights, the wire that goes back towards the transmission tunnel with the O2 sensor wire is not needed?

Those green and blue wires w/ wht stripe?

That's the one's!

[mtlbloodshot]

I have to solder the two wires coming from under the shift boot to the two wires coming from the engine harness and have all four basically staying with the plug for the transmission sensor?

[328ijunkie]

^Wait what? nono. The E30 reverse lights come through the shift boot to the trans and to the body harness. The E36 reverse light harness is in the engine harness and goes nowhere from there depending on how your wiring was done.

[mtlbloodshot]

Okay so the square plug that goes towards the rear of the car in the transmission tunnel is not used. Just strictly use the under shift boot wiring