VR Sensor was 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?
Reply from support:
- 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 (eg. the actually measured 0.4V 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
Reply from Per:
Thanks, Will update with findings. I verified ground setup with a DVM earlier, but i'll check with a precision milliohm meter as well.
Measured the new VR sensor to 815ohms, and a older functional one to 650 ohms. Both make voltage when you put metal in front of it.
Update from Per:
Measured 0.4V on P259 VCC - Soldered off P259 VCC - Measured 5V on LM1815 VCC - Soldered P259 VCC back on - Trigger is working!
Maybe i found a short around the pin i took off?
- Could P259 latch GND to VCC and stay there? Thus me resetting it by taking off VCC pin?
- not sure what happened, unusual indeed
- Ground system verified and OK.
Reply from support:
- Not sure if anything is connected to p259 output in your wiring (since no wiring details provided in editable thematically organized project page), but carefully inspect and measure the grounds. If the p259 got damaged, it has a cause. If not fixed, the new /repaired unit might (will) get damaged also.
- After making sure the grounds, the ECU can be operated even with removed p259 chip if necessary (eg. if damaged and no replacement available). But if p259 was damaged (sacrificed itself and saved other parts) because of grounding problem, without fixing the grounds it is not a good idea to operate anything, because more damage will follow.
- More note: Removing the whole p259 is valid (if the grounds are otherwise good and verified). Just lifting the VCC of p259 is not a valid setup (to power up, because the processor LBUS line signals are almost shorted by p259 inputs), interesting that it was somehow fixed.
Update from Per:
- I have complete detailed wiring in a google sheets page that i provided in the main page - it has all wiring of the car, and the VEMS Specifically in the "ECU System" tab. The connections between "ECU system" and other sheets are the leftmost column of each sheet - i will update MembersPage/PerH/VemsWiring with use of this sheet.
- I'll update with .vemscfg as well, but remember that this still i incomplete - i havent even turned the engine over yet and have only verified inputs and outputs.
- The ground- wiring configuration isn't detailed in the google sheet, but it's made like prescribed in the user guide regarding cable lengths.