TheOtherOne Posted December 15, 2016 Report Share Posted December 15, 2016 Hey,So this is an issue I've had for a while, and haven't really known what to check.Everything I've read says that the ECU should just pick up a VSS from the dash (Mechanical sensor) and nothing should need to be done to set it up.I've tried two different ECUs on two different cars, and two different clusters on one car, and haven't been able to get it to detect a VSS at all.Is a digital sensor/matching dash required for this to be detected?Two separate G4+ Plugins were testedOne in a 1997 V2 WRX with two separate clusters testedThe other in a 1991 Legacy RS RABoth used mechanical linkages to the clusterOn all three clusters the actual speedometer worked perfectly as well. I'll be installing the link into another RS this week, a 1989 model, also with a mechanical Speedometer and will see if I have any luck on that, but if there's anything I need to test it will be on that car. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Scott Posted December 15, 2016 Report Share Posted December 15, 2016 Looking at our WRX V1-2 plug-in ECU the speed signal should come in on Digital Input 4, which is pin 58. Look at the 'Digital' tab of the Runtime Values Window to see if you have any frequency or speed showing up on digital input 4. If you do not, then go to the Digital Input 4 settings and try turning the pullup resistor on. Check again to see if you have any data coming in on the Digital tab of the Runtime Values Window.You can open the Runtime Values Window by pressing 'r' or 'F12'.Scott Quote Link to comment Share on other sites More sharing options...
TheOtherOne Posted December 15, 2016 Author Report Share Posted December 15, 2016 Thank you for that Scott. I'll try get the ECU in tonight and give that a test. If I were to remove the dash from this car completely, what would be the best way to get the VSS to the ECU? Would I be able to swap out to the newer (BG I think) factory digital speed sensor, and just wire it up to pin 58 DI4?Thanks. Quote Link to comment Share on other sites More sharing options...
Scott Posted December 15, 2016 Report Share Posted December 15, 2016 Yes, if that speed sensor will physically fit to the transmission then the ECU will be able to work with the sensor output. You will need to play around with the calibration number until the speed reads correctly in the ECU.Scott Quote Link to comment Share on other sites More sharing options...
TheOtherOne Posted December 15, 2016 Author Report Share Posted December 15, 2016 Awesome, thank you for that. I'll have a play around tonight and see what I can do, and will update here. Quote Link to comment Share on other sites More sharing options...
TheOtherOne Posted April 11, 2017 Author Report Share Posted April 11, 2017 Thought I should update this, only got this ECU into a car that could actually drive, a few weeks ago.Enabling the pull-up resistor worked perfectly, thank you very much for the help! Quote Link to comment Share on other sites More sharing options...
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