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One other thing, I saw posts about the immobilizer causing no starts, not sure how to bypass.
Posted by: lliejk (15610) on 2017-11-29 10:07:52 In Reply to: URS4 No Start Update: New ECU Does not fix it, still won't start posted by The Scrambler on 2017-11-27 19:23:37	Share \| Report

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URS4 No Start Update: New ECU Does not fix it, still won't start - The Scrambler 2017-11-27 19:23:37 (729 views)
- One other thing, I saw posts about the immobilizer causing no starts, not sure how to bypass. - lliejk 2017-11-29 10:07:52 (374 views)
  - URS4 Boy, can you confirm? I am under the impression B4, C4, B5 and Early C5 all do not have imm - The Scrambler 2017-11-29 15:08:11 (341 views)
    - even with immo ecu it will start but then cut out - nz_vag_noob 2017-12-01 01:10:13 (354 views)
    - There weren't any immobilizer AAN ECUs in the NAmerican UrS4/S6s. In Europe? Yes. - UrS4boy 2017-11-29 18:57:48 (345 views)
      - Perfect. Just as I thought.   -  The Scrambler  2017-11-29 19:39:29 (339 views)
        
        Post up the Part number on the Motronic ECU to confirm the no-immobilizer situation (or not)   -  UrS4boy  2017-11-29 22:01:37 (331 views)
        
        4A0 907 551 AA   -  The Scrambler  2017-11-29 23:02:37 (663 views)
        
        So the same as this (inside) (standard NAmerican UrS4/S6 ECU - no immobilizer)   -  UrS4boy  2017-11-30 17:02:09 (335 views)
        
        perfecto.   -  The Scrambler  2017-11-30 23:58:56 (301 views)
- Yeah, I'm thinking those 20 key cycles wore it out. : >) This ECU swap should make you start - scarman 2017-11-28 12:27:15 (413 views)
  - Only actual part installed since the 20 key cycles is the different ecu.... - The Scrambler 2017-11-28 16:15:45 (383 views)
    - Oh, and i replaced the thermal fuses with regular ones. - The Scrambler 2017-11-28 16:19:20 (364 views)
- Have you tested the fuel pump output? - lliejk 2017-11-28 10:50:24 (357 views)
  - Item 4.3 in my no-start check list (which he should follow IMHO) - UrS4boy 2017-11-28 11:12:46 (577 views)
    - Believe it or not, i have gone though your list... - The Scrambler 2017-11-28 16:17:52 (378 views)
      - No spark? Then it is a G4, G28 or G40 issue. Likely the G4 pin on the FLYwheel is missing.   -  UrS4boy  2017-11-28 16:52:01 (662 views)
        
        Detailed Location and Size of the G4 Crank Position Pin (Link below photo inside)   -  UrS4boy  2017-11-28 17:01:22 (418 views)
        
        Don't get too excited. He has been looking at those. You are going to have us looking for this  -  scarman  2017-11-28 17:00:49 (344 views)
- Have you checked that the G40 output voltage is low when the flywheel pin is under the G4 sensor? - doron 2017-11-28 01:20:18 (402 views)
  - I saw the waveform on the scope. Next week when I am home again I will get pics of all of the wave - The Scrambler 2017-11-28 09:23:52 (359 views)
    - Sensor waveforms not only have to be present, but the G4 pulse has to be within the G40 "window" - doron 2017-11-28 13:43:35 (407 views)
      - I did not confirm with a dual channel scope, i did confirm all 3 of the aforementioned mechanical p - The Scrambler 2017-11-28 16:21:49 (358 views)
      - Also, when you checked the fuses above ECU did you measure their continuity on a DMM ?  -  doron  2017-11-28 14:17:12 (368 views)
        
        I not only checked the fuses, but replaced them with traditional fuses.  -  The Scrambler  2017-11-28 16:22:32 (347 views)
        
        given it wont start on starting fluid, i am leaning toward the issue being something else.   -  The Scrambler  2017-11-28 16:23:03 (355 views)
        
        Multiple areas like FP relay, coils, & injectors not functioning could point to a common cause  -  doron  2017-11-28 19:36:44 (433 views)
- Does the engine turn over with the starter? Do you have spark? Do you have fuel? - ThetaTau87 2017-11-27 23:54:12 (371 views)
  - yes, no, no - The Scrambler 2017-11-28 10:46:26 (385 views)
    - I missed this one, no spark should lead you in a different direction. From Kinderutz on the C4 - lliejk 2017-11-28 11:37:09 (470 views)
- And you've gone through the No-start check list issued in the Monthly Reminder? Link inside - UrS4boy 2017-11-27 21:45:59 (387 views)
  - indeed. - The Scrambler 2017-11-28 10:46:54 (356 views)
- Can you give us a quick rundown of symptoms/diagnostic thus far? - The_Kid 2017-11-27 21:31:10 (363 views)
  - He wants answers, not questions. : >) - scarman 2017-11-28 01:39:13 (367 views)
    - Thanks for lifting this from the dead. I should have done that in my OG post! - The Scrambler 2017-11-28 08:42:08 (397 views)
- My no starts were - airbil 2017-11-27 20:50:53 (481 views)
  - no start - URS6 2017 2017-11-28 11:53:19 (406 views)
    - The quantity of posts doesn't mean the answers are always here though. Keep submitting ideas. - scarman 2017-11-28 16:38:17 (380 views)
    - Indeed, i have a 1.8t coil conversion that I did - The Scrambler 2017-11-28 16:20:36 (372 views)

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