SMac770

youtu.be/tOiGmkw1IEM?t=227

At this time, we see the guy with his starter out, the lug on the wiring harness that attaches to the term 30 post. The wire carries on around the back to the alternator on the front left.

regularcat193

Indeed it's buried behind the mount and catalytic converter. What a pita this job is. Term 50 (solenoid signal) to solenoid is 12 volts when attempting to start the car. Term 30 is the power to the actual starter from TV22. I have no current draw on it when attempting to start the car. I believe the ECM is telling the relay to send power to the starter solenoid but the solenoid is not closing the contact to energize the starter. I'm 95% sure the starter is the problem. I know where it is and how to get it out. Last thing I would like to check before tearing it all down is visually inspect connection at the starter term 30. I'm going to try and angle a mirror to inspect the connection to verify no broken connection. Good feeling I'll be pulling it and replacing it.

Chris719

Bought a 2010 Audi A5 2.0t with 90xxx miles form Copart. Dose not crank no voltage at term 50. I know engine is good, jumped the 2 404 starter relays started for a sec then shut off.

Key
Clutch switch
Starter
Ignition switch
Tested passed good
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SMac770

So it sounds like you've already determined it's the starter relays, no? If you replaced the relays and still no good, maybe the ECM's management of the starter relay control grounds is not good.

Chris719

Replace ecm and both starter relays. I also picked up a used ecm same part number but not programmed and did the same, it started for a second then shut off. Could it be a security thing? What I don't understand is I only got it to start one time on each ecm. Then I go back to start it and it won't start just crank while jumping relays.

SMac770

Heh, well another guy had a similar problem with cutting off very quickly after combustion start and turned out to be the ECM grounding at the left end of the plenum chamber. But in both cases, they had codes for voltage issues, and they were TDIs. Do you have a VCDS scan for codes to see what the ECM is actually saying?

Chris719

Scan it with Autel im608 getting code.
P01206 - Signal for Duration of Ignition Off

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SMac770

i think if you search on that, one or the other cube relay (J271 and J757) in the ECM box commonly comes up with that code. These are the 643 or 645 marked ones. These are ECM controlled, same as the starter relays. The J271 supplies 12v to all kinds of engine related stuff. On the 2.0T, the J757 only powers the HPFP control valve, but you're not running without that. But in the end, it's likely some manner of voltage issue.

Also, it's not a P code if there's not a P. 01206 It's some Audi specific thing. And it's often from the J255 climate control system. Codes are not helpful unless it's known which control module they are from. But that DTC in particular is generally unhelpful because Audi doesn't ever clearly document it's cause or meaning.