macambra Posted February 13, 2012 Share Posted February 13, 2012 So, I am finishing the final connections of my MS2X, and I noticed that the DIYAutotune 280zxt wiring diagram and the MegaManual witing diagram do not jive. What do I do with the CAS lead that goes to pin 2 ? Quote Link to comment Share on other sites More sharing options...
mobythevan Posted February 13, 2012 Share Posted February 13, 2012 The picture you attached from the mega manual is for a fuel only installation. That may be causing the confusion. If you intend to have MS2 extra fire the coil then follow the instructions from DIYautotune and you should be good to go. Quote Link to comment Share on other sites More sharing options...
macambra Posted February 13, 2012 Author Share Posted February 13, 2012 (edited) Thanks, moby. What do I do with the lead? Just cut it off? Ground it? Edited February 13, 2012 by macambra Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted February 14, 2012 Share Posted February 14, 2012 Which lead are you concerned about? Pin 2 on the MS DB37 connector is a ground. You should run the CAS signal to pin 24. If you have a pre-assembled V3.57 board, you can install the 1K Ohm pullup resistor internally on R57. It keeps the wiring cleaner. You should use shielded wire with the shield grounded at the MS. The other CAS signal wire can be left alone / disconnected. The difference in the two pics you posted is that the megamanual install is getting the tach signal from the coil neg. The DIY install is getting the CAS from the 280ZXT optical pickup and then driving the coil. Sam Quote Link to comment Share on other sites More sharing options...
macambra Posted February 14, 2012 Author Share Posted February 14, 2012 Which lead are you concerned about? Pin 2 on the MS DB37 connector is a ground. You should run the CAS signal to pin 24. If you have a pre-assembled V3.57 board, you can install the 1K Ohm pullup resistor internally on R57. It keeps the wiring cleaner. You should use shielded wire with the shield grounded at the MS. The other CAS signal wire can be left alone / disconnected. The difference in the two pics you posted is that the megamanual install is getting the tach signal from the coil neg. The DIY install is getting the CAS from the 280ZXT optical pickup and then driving the coil. Sam OK,so do I need to gound pin 2? Sounds like it's internally grounded... Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted February 14, 2012 Share Posted February 14, 2012 http://www.msextra.com/doc/general/ms2external.html Quote Link to comment Share on other sites More sharing options...
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