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Thread: No power to the ECU

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  1. Re: No power to the ECU 
    #11
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    There is no definitive fuse map for the four main standard equipment model fuse boards SA, SB, SC and SD, it all varies by equipment, so you have to look it up for each circuit and follow the current flow diagram. I personally love VAG current flow diagrams, I print them out and read them in bed....

    That relay is now 4H0 951 253 and has 644 marked on top, this is the second revision due to reliability issues, it is £17.93.

    Have patience with your garage, modern car electronics, especially the type 36 Passat, are incredibly complex and fussy, a lot of professionals are really struggling to keep up to the point that you could now do with a VAG specific electronics specialist on hand at all times and that's a £40K a year overhead so we older grease monkeys have had to try and cope. If they can fire the relay up by sneaking an earth under it to pin 86 (corresponding to socket 3), then the continuity of the wire from socket 3 (a 0.5-mm core black/grey) should be checked back to pin 69 of the larger, 94 pin, plug at the ECU before doing anything else.

    In the last few weeks I have had a type 3C Passat totally shut the car down to to a faulty steering column lock and a Golf 5 lose all it's left side door functions for no good reason which came back after plugging in a new controller but then the full central locking system did not work, which it had, so I plugged the old controller back in and everything worked again! Cars are now a PC on wheels.
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  2. Re: No power to the ECU 
    #12
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    Thanks. Those are some great suggestions I will look into further once I have the ecu back we'll both ecu's back now as I've asked for my old one back too. I love this car but it's been the worst car I've had for reliability. A common fault on the clutch chewed the bell housing up and it goes limp with an egr fault on long journeys. I just want it back now, it's been near 4 weeks
     
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  3. Re: No power to the ECU 
    #13
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    The type 36 was a VAST improvement in reliability over the later type 3C from 2009 which itself was a huge improvement over the first type 3C Passat from 2006>2008 which, in my opinion, is the MOST unreliable vehicle VAG have produced in around half a century, I think only the K70 and closely related RO80 came anywhere near as being so bad, an absolute joke of a car.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  4. Re: No power to the ECU 
    #14
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    update.... the ECU guy predictably said its fine as was the old one so he is sending me my old one back to the garage. Back to the drawing board then. Ive passed those notes you sent on there crasher so i really hope they help them out.

    Ive bought a copy of ELSAWIN but ive no clue how to get the information i need out of it as i dont know what the gearbox code is or the vehicle ID number. There are some good diagrams in there somewhere though!

    one thing the garage did say was that worst case we might be able to take a feed from the ignition feed to the ECU to switch the relay. Im not sure if thats a good idea though
     
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  5. Re: No power to the ECU 
    #15
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    They should not need to bodge it but a couple of years ago my friend had a relatively young A3 with the same problem and I diagnosed that the command wire in the harness was fractured "somewhere". As it was a sales car, he made up a jumper wire because the trader was not prepared to spend the money fixing it properly.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  6. Re: No power to the ECU 
    #16
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    Well I'm over 1 month without the thing now so I'm getting desperate.
     
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  7. Re: No power to the ECU 
    #17
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    Have they tested the continuity of the relay trigger wire from the ECU to the engine bay central electrics?
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  8. Re: No power to the ECU 
    #18
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    Yes he said the continuety from the ECU to the relay is good. I was thinking its an obsure earth elsewhere in the chain on the othre side of the relay maybe, unless that also goes back to the ECU.
     
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  9. Re: No power to the ECU 
    #19
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    The black/grey relay trigger wire from the ECU is direct from the ECU with nothing else that can interfere so if the relay can be driven by giving it an earth, the ECU is not providing it with an earth to trigger it which means the ECU is not powered up or faulty. PM me your email and I will send you the wiring diagram.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  10. Re: No power to the ECU 
    #20
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    Between the garage and the ECU guy they determined the correct pin for the ignition feed is reaching the ECU, this is where they will take a switched relay from if they cannot find the issue soon, so the ecu should be getting something. I didnt fully understand the ELSAWIN diagram i sent to the garage but are you saying the 2 wires to the relay to switch the relay are from the ECU?
     
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