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TT link no 12v coil supply


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Hello all, 

The other day I was driving the car and came to a set of traffic lights and the car suddenly stopped, might I add the hazard lights came on constant, not flashing! And could not restart the car :(

on investigation the TT LINK was not sending out 12v to the coils via pin 118 or 121, so I have ran my own wire for the time being to a switched 12v supply to get me going

Also what does the ecu require in order to supply 12v to coils? Is there a crash detection wire on ecu? I ran a Vcds code scan and I had a crash code although I haven’t crashed, just wondering if this could affect the ecu’s normal function

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There is probably a relay activated by the ECU, the ECU will not supply the coils. 

Have you checked if the relay and fuse are ok? 

Did your wire go directly to the coils or does it activates the relay? 

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The coil power supply is not from pin 118 or 121.  Some models have a constant 12V supply to pin 121 from the same circuit as the coils but our ECU doesnt use that - pin 121 is connected to nothing.  Pin 118 is the negative for the E-throttle motor so whatever you do, dont connect that to 12V, it will fry the ecu.

The coil power comes from fuse#37 which is the main Motronic relay power supply.  

6i8faxz.png

 

 

dtlVIow.png

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  • 2 weeks later...

Thanks for the help, sorry for the late reply I’ve been busy with other things lately! Good job I haven’t connected anything to that pin lol, going to charge the battery and investigate today, pretty sure I buzzed the coil live wire to pin 121, could be wrong tho, I will post findings :)

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