S85B50 (subpage of MembersPage/RijaRobinson)
BMW s85b50 engine from e60 M5, odd fire V10 wasted spark (90,54, ...) sequence, so +-18 crankdeg compared to 72 crankdeg even fire
ECU is V3 with internal CAN
Engine has CAN bus controlled throttles
- engine runs
- Primary trigger VR works now
- 4 cam signals are all OK
Ground point is bolt on the chassis. Strongly tightened.
Historical investigation,fix,install:
- Everything is working except Primary trigger VR signal.
- IMPORTANT: PLEASE DO measure input DC voltage with input open and with 1k resistor between ground and EC36/27
- >0.5V (1.35V typically for 2k7 internal pullup) likely HALL input. Measuring <270 mV means weak internal pullup (likely VR), perhaps p259 damaged causing VR not sensed ?
- I have a spare Ecu to test the same trigger on the same harness and it sees the primary signal.
- All the 2nd 3rd 4th and 5th signals are seen on the triggerlog but the 1st.
- Double-check grounds just in case, and see [repair/upgrade]
- I have an engine simulator also to test and the same thing happens.
- The spare ecu is OK.
DB review and feedback
- If the ecu was ordered with pri = VR and 4x HALL (for cam triggers) than it should just work out of the box
- Your other testing (with the other ecu and engine simulator) suggests its not a problem with wiring or sensor, this must be some ecu mis-configuration.
I have checked P259 channels 4,5,6,7 making vanos solenoids ticking. They work, apparently p259 is not dead.
I can also simulate Hall sensor signal with the Jimstim but prim signal still missing.
I sent back the ECU for repair
ECU is back from Hungary.
Now all the trigger signals are ok.
Need more settings for throttles. After cranking the throttles go to limp mode.
Time to start but I cannot find the right configuration for trigger settings. No configlet for bmw v10.
- i recently was searching for something and came a cross this,maybe it can give you some directions to play with http://forums.linkecu.com/topic/887-odd-fire-v10-wasted-spark/