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Note: it is recommended to split thematically to several pages. (inputs, outputs, other wiring details, issues, etc...) * Important: Detail your wiring grounding. See GenBoard/Manual/GroundConnections ** Device will get damaged if grounding is not good. ---- 2026-04-24 Introduction: https://cdn.cuoresportivo.no/content/monthly_2024_06/image.png.75ff78a11852acb1fcbc16162829221c.png I have a '72 1300 GT Junior, and mounted a 2000 GTV race engine with 45 Dellortos. Now i'm in the process of installing FAJS ITBs and the following equipment: Trigger: VR primary using standard 60-2 wheel from Alfa 75 TS and a custom sensor mount: https://photos.app.goo.gl/N9hCkHMZMPPiGVMNA HALL Secondary trigger using the distriutor (welded the centrifugal advance shut): https://cdn.cuoresportivo.no/content/monthly_2026_04/image.png.b9d24e92d4ea5527d81c9cb444086504.png Other sensors are: TPS, IAT, CLT, Map (VEMS module), and one knock sensor (https://photos.app.goo.gl/GVaZPkz6Tbzyhf47A). The VEMS 3.3 was ordered (by a friend of mine, who didn't use it) like this: https://photos.app.goo.gl/WZB3iErdmVmpauTG6 Ignition is a standard Bosch ignition module running a motorcraft coil (wasted spark). This is my wiring list (note the multiple sheets for compartments). https://docs.google.com/spreadsheets/d/1WkJJKJcAgj85k8Yi9UjYWuoVEFGESkDZ/edit?usp=sharing&ouid=111245947298559606603&rtpof=true&sd=true __________ With everything connected, I verified that '''all sensors except primary trigger was functional'''. '''Problem 1:''' VR Sensor is dead. * If "VR sensor is dead, replace VR sensor". You mean VR input is dead? What is the measured resistance of VR sensor? Tested one i know works from another car in addition to the brand new one for this car, and the sensors were also verified to the EC36 connector using oscilloscope. I also connected the VR sensor only i this test setup: https://photos.app.goo.gl/bzDayVM8pNMGwoHA9 No luck, not one single trigger event in the log. Dead p259? * If you disassemble the device (remove endplate first, unclamp the 2 or 3 clamping plates before removing frontplate screws; Be patient, don't damage the insulator-sheet) ** you can measure the +5V supply of p259 (and LM1815) chips. The related regulator also might get warm, indicating current * voltage = dissipated power ** See GenBoard/VerThree/Schematic ** If the LM1815 VCC is less than 0.8V (indicating that likely damaged p259 is shorting it), removing p259 might be a good idea. ** Make a rectangular window from aluminium foil to prevent neighbor components from falling off when heating the p259 chip with hot-air heat-gun ** But first review and fix and document your GenBoard/Manual/GroundConnections ---- '''Problem 2:''' I have the VEMS ignition, fuel pump and coolant fan setup with 9 fuses. fuel pump relay ground is connected to EC36/17 (injector channel) and Coolant fan at EC36/6 (injector channel). None of these relays actuate in test mode. * You can configure for MISC1 or MISC2 output, and change the inverted flag (in outputs dialog) back and forth to test. ** (note: use a "diagonal matrix in injector output groups dialog, so each group contains exactly one injector FET output). ** If there are damaged injector channels, removing or replacing the p259 will NOT fix the problem. ** See [https://shop.vems.hu/catalog/repair-upgrade-p-103.html repair/upgrade] if you cannot or do not want to fix it yourself. ** VemsTune: See [https://vems.hu/vt/ vt] '''Even with newest VT, for new (round or ECU) firmware compatibility, please: Preferences / Update ini files from web.''' - confirm that you've done Update ini files from web. ---- '''Problem 3''' (ignition outputs?): I havent tested much on this yet, but i was unable to get plug spark using test mode. Will look more at this and update. * always make sure to have GND return path. But with other problems, it is recommended NOT to try to spark. Use 1k resistor in series with a LED, and test output with that (the anode to +5V, testing 1 switched output at a time).
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