S85B50 (subpage of MembersPage/RijaRobinson)
BMW s85b50 engine from e60 M5.
ECU is V3 with internal CAN
Engine has can bus controlled throttles
First issue: Primary trigger is VR is not detected (not seen in triggerlog and RPM=0).
Ground point is bolt on the chassis. Strongly tightened.
The 4 cam signals are all ok.
Info provided by email:
- 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.