Rory nimmo Posted September 2, 2020 Report Share Posted September 2, 2020 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 Quote Link to comment Share on other sites More sharing options...
dx4picco Posted September 2, 2020 Report Share Posted September 2, 2020 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? Quote Link to comment Share on other sites More sharing options...
Rory nimmo Posted September 2, 2020 Author Report Share Posted September 2, 2020 Hi thanks for the reply, I traced the wires and they both come directly from pin 118 and 121 of ecu, I have also checked all fuses and relays inside the car Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 2, 2020 Report Share Posted September 2, 2020 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. Quote Link to comment Share on other sites More sharing options...
Rory nimmo Posted September 11, 2020 Author Report Share Posted September 11, 2020 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 Quote Link to comment Share on other sites More sharing options...
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