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Summary of change:
I have noticed that V3.8 have some differences when adding third trigger. * maybe you want to detail what you noticed * Effectively '''same usage as v3.7''': ** find SDA pin (throughole pad of small 2 pin header, see below) ** with the cam-HALL sensor: pull "SDA pin" to GND, or apply 0/5V signal ** enable 3rd trigger in config * GenBoard/VerThree/Schematic I have made the same circuit i used on ma 3.7 board but on the 3.8 board it does not seem to work? * the components for third trig protection (diode, and capacitor) are onboard for v3.8 (but adding another set would not cause any noticable effect). * if you really made same circuit, it should work * maybe you can detail the exact circuit (component by component, see the snippets from VT help below as a guide), so there is at least some chance someone can help ---- [http://vems.hu/vt/help/v3/v3_camshaft_angle_control.html VT Help] says "Use Pull-up resistor, a 10k protection resistor, and protection Diode, and a 22nF capacitor (min 10nF) between processor pin and GND." ** '''This is exactly what i did, I had this on a 3.7 unit, and a moved it all over to this unit. Does not work. Thanks for the guide, will measure everything, might have made a mistake somewhere - ENGDAHL ''' Only '''essential components: "Pull-up resistor, a 10k protection resistor"''' * (v3.8 has protection diode and capacitor anyway) '''With that in mind, the minimum info in a request''' would be : '''Third trigger input''' * Your pullup resistor value ? (typ 2k7) ** voltage measured on (HALL type) third trigger input ? (input open and shorted to GND). * your series resistor value ? (typ 10k) ** voltage measured at processor SDA pin ? (should be >4V with input open and <0.8V with input shorted to GND) * diode towards +5V present or not ? ** diode towards GND present or not ? ** BAV99 combines both these diodes in a sot23 package ---- I read somewhere about some capacitor need changing? * where do you read ? * Maybe you read that "max 1nF" for Nissan sectrig ? ** that is not relevant for third trig, (or non-Nissan), and even for Nissan sectrig, although a checklist item, should be good by default since 2011 ---- Please write a complete guide of what needs to be done for third hall trigger on 3.8 board. * See [http://vems.hu/vt/help/v3/v3_camshaft_angle_control.html VT Help] about third trigger (camshaft angle control). * shape signal so that it's a logic signal, and connect it to the processor input (really-really simple, just a series resistor for HALL type ; or a separate circuit with VR=>HALL adapter for VR) ** see GenBoard/VerThree/Schematic ** detail what you have found and changed, and measured * otherwise just order [http://shop.vems.hu/catalog/vems-p-48.html ECU] with third trigger ** normally thirdtrig is same type as secondary trigger (typically HALL, rarely VR) I'm trying to change this '''v3 s/n 9422''' from VR/VR (well: it is VR/HALL in the first place) '''to HALL/HALL/HALL''' Atleast I think it was VR/VR because is has the second LM chip. Whats strange though is that the '''blob under the FETS was open''' * blob under the FETs open => So sectrig is HALL (even if it has secondary LM1815) ** so everything suggests '''secondary_trigger: HALL''' But when I try to ground the signal on Pin 13 It looks like VR interference, not clean signal. * I don't understand the "looks like VR interference" part. Can you scope it ? ** With HALL, a DVM can be used, '''fill in same measurements as for third trig''' (see above). ** First do NOT ground, just measure voltage on input with nothing connected. And no signal on third what so ever. Have I just forgotten some settings in VEMStune maybe? * enable third trigger => the chosen edge transitions should show up in triggerlog * Can you confirm that (measured on SDA pin), voltage changes between say 0.1V and 4.2V ? ---- '''v3/9422 orig specs (might have been changed since than) ECU VEMS V3 * - primary_trigger: EC36/27 VR * - secondary_trigger: HALL * - EGT input: 1 * - Flyback: LowZ active flyback 8ch * - ignition driver: 8 * - Knock input channels: 0 * - LCD connection: no * - MAP connection: 400kPa (6/4mm pneumatic) * - mounting-style: no-screws * - 1-wire interface: no Does it match ? ---- See [http://vems.hu/download/v3/doc/assembly/trigger/ V3.8 genboard 3rd trigger input] http://www.vems.hu/files/ThorbjornEngdahl/sm_3rd_trig_top.png * '''SDA pin is 3rd trigger input (pull to GND, or apply 0/5V signal: effectively same usage as v3.7''', just less likely to damage something because of added protection) * R116 2k7 Pull-up resistor http://www.vems.hu/files/ThorbjornEngdahl/sm_3rd_trig_bottom.png * R114 10k protection resistor * D55 BAV99 protection didode * C105 1nF filter capacitor
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