MembersPage/Yaw_S50B32

BMW S50B32 engine I-6cyl straight

Pin numbers are for Motronic 88 connector unless otherwise noted.

Trigger verification

VR primary trigger
VR secondary trigger
VR third trigger

Third trigger (3rd trigger VR) s50b32/pin35

Via helper board (4 PFET + VR to HALL)

LM1815/pin12 output resistor output connected with wire to v3 mainboard SDA_in = 3d trigger
- also connected to mot88/pin67 "prim_3" signal.
  - This can be used to diagnose the signal (very short signal, possibly only high for appr 50..100 usec).
  - If mot88/pin67 is connected in the loom (eg. to GND or some other trace that effects the signal; a 2k7 or weaker pullup to +5V would not be a problem), that can be a problem (the wire or the mot88/pin67 trace can be cut in that case).

s50b32/pin35 input VR signal (trigg3_vr_conn)
- connected with stiff metal pin to helper PCB VR input (resistor goes to LM1815 pin3)
- Appr 0V
- appr 2 .. 3 V when pulled up to +5V with 1k resistor ?

GND return signal for S50B32 third trigger: mot88/pin .. ?

The 3rd trig GND return is verified manually. The tester tests 3rd trigger VR functionality, but with GND also connected elsewhere, so missing GND return for 3rd trigger might sneak through quality test theoretically (although it should not happen).

We investigate what extra step needed, how it can be prevented.

GND signals for S50B32 :

Please verify all:

...

I remember one guy from france had problem with s50b32 P&P unit and the problem of it was that somebody forgot connection between pfet/vr interface board and main pcb. there was no wire, after installing it it was fine

Valdas

Was it the Ground missing for 4 PFET + VR-HALL (3d trigger) PCB ? Theoretically verified during flyback test of 4 PFET, but perhaps not connected by trace for the VR-HALL (3d trigger) ?
or it was the HALL signal (output of the VR-HALL adapter) missing ?
We suspect that GND connected in test apparatus, it could sneak through 3d VR test, we look to add explicite testing step for that to make sure GND is connected there as well.

I have checked pictures guy sent me and it seems that problem was input to the lm1815 chip it was missing connection from pcb to vr interface

See MembersPage/SFiftyBthirtyTwo