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Title: 01 S4 ECU schematics, rear 02 issue Post by: Divune on November 06, 2019, 09:52:56 PM Hi all. Trying to chase down a open circuit/high resistance code(P1122 & high resis) on my B2S2 rear 02(just for smog). I'm having an odd matchup with what I find on this ECU Pinout. Car is an 01.5 6 speed.
https://www.docdroid.net/zrj0/2001-audi-s4-6-speed-ecu-pinout.pdf According to that pinout, ECU connector Pin #9 is for the IAC control .My car does not have IAC nor do I think any manual S4s did. On my car, both terminal 1 harness 02 connector on B1S2 and B2S2(green/yellow wire) they lead to that Pin #9 at the ECU connector. Terminal 1 02 connector (green/yellow) on both also show continuity between each other. Really confused on why those are showing cont, I have no issues with B1S2 and it reads fine in VCDS. B2S2 is just a constant .45v. I wanted to direct wire B2S2 to the ECU connector, but apparently with how its wired currently that seems I will cause an issue with B1 since they are linekd somehow. Really appreciate any input, CA smog is killer and this tiny issue has the car grounded. AZ link if interested to read, skip most of the first comments I thought it was corrected. https://www.audizine.com/forum/showthread.php/867231-Rear-02-heater-circuit-open-wiring-or-ecu-possibility |