MembersPage/GunnarReynisson/M50-Nonvanos-trigger (2024-02-21 03:31:16)

BMW M50 Non vanos (VR, VR) PNP ecu trigger issue.

If the ECU has been setup as Vanos, would the crank trigger still work?

Customer is getting "no trigger" (indicated by triggerlog or RPM or ... ?), scoped the input wire at the ecu and that all looks fine, but the ECU does not have a signal.

Suspicion: is there a chance that the ECU was mistakenly setup as M50 Vanos PNP which is causing this?

Before sending the ECU back what options can the customer take to verify the ECU is built right?

Note: The VR sensors have + and - wires. The ECU-s are tested on automated bench, but during that procedure the signalgenerator GND is connected via alternate paths also. So while most signals are tested by automated methods, the VR return path to GND is tested manually. It happened before (once in 200 perhaps) that the return pin was not connected to GND inside the ECU. It is carefully checked since, so should not happen, but just in case, measure the GND-s and all trigger pins (Ohm measurement to pin6).

The same set of measurements also reveals some bigger mismatch, eg. Vanos / Non-Vanos... (rather different, as you see in the xls... Even the cranktrigger input pin is different).


Originally on MembersPage/GunnarReynisson/Questions