Guide to your OBD2 swap! Diagnostics and logging

[328ijunkie]

I can't seem to get the obd2 adapter to read anything. I am using the diag port adapter and a bt obd2 reader. I know the reader works, used it in my wife's car. I can connect to it when it's in my car, so it has power. What could be wrong that it doesn't get signal from the ecm?

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Ive had some diag port adapters be DOA. I would also confirm the Kline is where it should be in the diag port. What harness/adapter are you running?

[NC325iC]

Harness is from a 96/97 e36 m3 auto, I removed the automatic transmission wiring as well as the other unnecessary wiring for sap etc...

The adapter is one from Amazon. Goliton is the brand.

On my Bluetooth adapter, o get the red light for power always, but I never get the green light that should turn on with ignition.

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[328ijunkie]

how did you wire C101?

[NC325iC]

To the best of my memory/documentation this is how its wired

[328ijunkie]

Missing nearly everything. How is the car running with no pin 7? Pin 6 powers the diag port.

[craiggroves91]

I really need to do this...

[NC325iC]

Like I said that was the only description I wrote down that I could find.

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[NC325iC]

What do you connect them to on the e36 side?

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[328ijunkie]

What do you connect them to on the e36 side?

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Green/White 22 Green/Yellow 6 O2 Sensor Heater
Green 21 Green 7 Ignition

[NC325iC]

Green/White22Green/Yellow6O2 Sensor Heater
Green21Green7Ignition

I know you are trying to help me, but I don't know what you mean when you just list colors and numbers

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[NC325iC]

OK I figured it out. I imagine that I have c104 pin 2 connected to x20 pin 21 providing ecu power

I will need to review and see if I have connection to x20 pin 22. But I believe I do because I get +12 at all the right pins in the diagnostic plug.

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[craiggroves91]

Would we be able to read live oil and water temps?

[Sh3rpak!ng]

Would we be able to read live oil and water temps?

You can view realtime any data that the ecu collects via a bunch of different obd2 gauges, scanners etc.

You can't view realtime oil temp because its not a sensor/parameter that the ecu monitors. But you can view water temp.

Edit: I think there are gauge/sensor systems that can be incorporated and datalogged along with the obd2 parameters such as oil temp, oil pressure, afr, boost/vac

[craiggroves91]

You can view realtime any data that the ecu collects via a bunch of different obd2 gauges, scanners etc.

You can't view realtime oil temp because its not a sensor/parameter that the ecu monitors. But you can view water temp.

Okay, thats what I was thinking after I posted. Thank you! I'll have to get this going soon.

[NC325iC]

OK so I looked at my c101 and it looks like I have it wired how you suggested.

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