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 (3d trigger VR)
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 this is connected in the loom (eg. to GND or some other trace that effects the signal; a 2k7 or weaker pullup 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 .. ?
This is verified manually. The tester tests 3d trigger VR, but with GND connected elsewhere, so missing GND return for 3d trigger might sneak through quality test theoretically (although it should not happen).
GND signals for S50B32 :
Please verify all:
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