Knox Posted July 13, 2020 Report Share Posted July 13, 2020 Hello, can someone inform me if I can use audi ttx plugin ecu on 2004 seat leon fr 1.8t ? I found that everything except oil gauge works directly when install plugin ecu but I need to be sure because I will advise to my customer. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 13, 2020 Report Share Posted July 13, 2020 Whats the engine code in this car? Quote Link to comment Share on other sites More sharing options...
Knox Posted July 14, 2020 Author Report Share Posted July 14, 2020 16 hours ago, Adamw said: Whats the engine code in this car? It is auq engine with ethrottle. Quote Link to comment Share on other sites More sharing options...
TechDave Posted July 14, 2020 Report Share Posted July 14, 2020 2 hours ago, Knox said: It is auq engine with ethrottle. This should work according to our data. Knox 1 Quote Link to comment Share on other sites More sharing options...
Knox Posted August 24, 2022 Author Report Share Posted August 24, 2022 On 7/14/2020 at 6:50 PM, TechDave said: This should work according to our data. Hello, today I installed audi ttx ecu to 2005 model seat leon fr with auq engine. Everything looks good, gauges works, wheel speeds work with can bus etc. Only issue I have is when I turn of the switch engine continous to work, voltage drop to 5-6volts but everything (coils, injectors) continoue to work. Sometimes engine stops but sometimes not. Where I need to check. First I tought there is issue with key switch but it looks like switch is not the issue. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 24, 2022 Report Share Posted August 24, 2022 That almost sounds like a backfeed through an aux output. Have any of the devices connected to aux outputs been changed, or perhaps any power supply changes to aux devices? Standard aux devices for this ecu are as follows: Tacho Turbo re-circ Wastegate NC Fuel pump relay Purge Canister CE light Quote Link to comment Share on other sites More sharing options...
Knox Posted August 25, 2022 Author Report Share Posted August 25, 2022 1 hour ago, Adamw said: That almost sounds like a backfeed through an aux output. Have any of the devices connected to aux outputs been changed, or perhaps any power supply changes to aux devices? Standard aux devices for this ecu are as follows: Tacho Turbo re-circ Wastegate NC Fuel pump relay Purge Canister CE light Thank you for fast reply. No addirional aux used right now. -If I just disable and try all standart aux’s can I find which one is backfeed or I need to take out sockets one by one ? - what is NC aux? I saw nc on manual and I tought it is “not connected” - Let’s say I find which aux backfeed the ecu, how can I solve this issue? Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 25, 2022 Report Share Posted August 25, 2022 NC means not connected. Just disabling the aux is not a valid test, you need to disconnect them. I think tacho is unlikely to backfeed so I would forget about that one for now, probably the CE light is pretty unlikely also. All the rest you should be able to just unplug them at the device then switch ign on/off to confirm if it still stays alive or not. This ECU could only remain powered up either by a backfeeding aux or some voltage on pin 3 (main power supply). So if disconnecting the auxes doesnt solve the problem I would investigate what is happening at pin 3. Quote Link to comment Share on other sites More sharing options...
koracing Posted August 26, 2022 Report Share Posted August 26, 2022 If the engine does stop as you say it does sometimes, does the ecu still have power even in those situations? Quote Link to comment Share on other sites More sharing options...
Knox Posted August 26, 2022 Author Report Share Posted August 26, 2022 3 hours ago, koracing said: If the engine does stop as you say it does sometimes, does the ecu still have power even in those situations? To be honest, I didn’t check voltage when it stoped. But when engine didn’t stop, I checked voltage drop to 3-5v first shut off after increase to 7-8v and engine continous to run. After adamw’s advices, I found that the turbo recirculation valve backfeed the ecu. Quote Link to comment Share on other sites More sharing options...
koracing Posted August 26, 2022 Report Share Posted August 26, 2022 Great so that resolved the issue - having that unplugged? Quote Link to comment Share on other sites More sharing options...
Knox Posted August 26, 2022 Author Report Share Posted August 26, 2022 5 minutes ago, koracing said: Great so that resolved the issue - having that unplugged? Yes for now issue solved, I didn’t finish the tuning yet but I don’t think I will habe other issue. I told to mechanic to remove the recirculation valve Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 26, 2022 Report Share Posted August 26, 2022 If you want to keep the turbo recirc valve then just move its power supply to a source that turns off with ignition. It should have been this way from factory but has possibly been messed with at some time. Quote Link to comment Share on other sites More sharing options...
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