mack85n Posted January 13, 2017 Report Share Posted January 13, 2017 Rookie Question,Is it possible to run a piggy back G4+ as a piggy back and let the stock ECU control idle?Also I was does a trigger input on a piggy back need the pull switched off? I thought this was only for analogue signals? TIA Quote Link to comment Share on other sites More sharing options...
Simon Posted January 16, 2017 Report Share Posted January 16, 2017 Yes you can do this.Any signal that is shared and requires a pull up should only have the pullup active on one of the units. So for triggers if it is a Opto/Hall signal then the Link ECU should have the pullup turned off. Quote Link to comment Share on other sites More sharing options...
Prootoon Posted March 4, 2017 Report Share Posted March 4, 2017 Rookie tooHi Simon Can you draw a pic an example wiring??I had confused line in or out form stock ECU to INJ/IGNThank a lot Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 5, 2017 Report Share Posted March 5, 2017 The ignition and injection would only be connected/controlled by the G4+. The stock ECU would not be connected to inj or ign at all. Quote Link to comment Share on other sites More sharing options...
Prootoon Posted March 5, 2017 Report Share Posted March 5, 2017 (edited) The ignition and injection would only be connected/controlled by the G4+. The stock ECU would not be connected to inj or ign at all.In Piggy back Mode????If Link G4+ Connect direct to INJ/IGN only it call stand alone?? Edited March 5, 2017 by Prootoon Quote Link to comment Share on other sites More sharing options...
Simon Posted March 5, 2017 Report Share Posted March 5, 2017 Piggyback is where the factory ECU is still used to control the functions the second ECU is notStand alone would be where the stock ECU is totally replaced. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 6, 2017 Report Share Posted March 6, 2017 To give a little more info...There are many different scenario's or reasons for a piggy back type install but typically it is done where the aftermarket ECU cannot properly control or duplicate some function that the OEM ecu has. This would most commonly be features such as automatic transmission control, cruise control/DBW, or CAN comms to other modules in the vehicle such as the instrument cluster. The OEM ecu would typically only be left with the bare minimum function it needs to control, all other engine control will be done by the aftermarket ECU. The problem with many modern OEM ECU's is they have many saftey and diagnostic strategies built in that detect when for instance the injectors are disconnected. This means the installer needs to be very familiar with how the OEM system works so he can work out a method to "fool it" into thinking everything is connected and happy. Piggyback installs are often very difficult to get right and should only be attempted by a very competent installer. pattun@NC3 and SF4AB 2 Quote Link to comment Share on other sites More sharing options...
Prootoon Posted March 6, 2017 Report Share Posted March 6, 2017 Ok I Got it Thank a lot Guy Quote Link to comment Share on other sites More sharing options...
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