Trigger related subpage of MembersPage/MarcellGal/PowerAndTraction
There is still some uncertainty about which sensor position is which.
They mounted the engine (apparently properly ;-) but ... the 2 sensors were in a box. The 2 sensors
- look almost identical (one has grey boot, the other has black)
- with same pinout,
- measure 1001 and 985 Ohm, respectively
- has 3-pin AMP-style male connectors.
- using a DVM in DC mode, and a wrench, I checked in 1 min that the mid-pin must be GND for proper polarity (and the pin at the side must be the signal). The proper polarity (with LM1815 that senses falling edge) means signal is positive when wrench gets closer to sensor and negative when wrench comes away. Of course, in the factory wiring the GND (which is shared between the sensors, and probably with other sensors) is the other, so I need to reverse that in the harness. This confirms what Miska documented earlier.
- the holes at the very top of the clutch housing, see [pic15] and [pic14] look like those for VR sensor (maybe not: hard to tell with engine mounted). Not sure what this can be good for, though....
- See [pic17] for the 2 good candidates for crank135 and crankhome. Teppo said: "they are both on the right side of the engine" => also confirms this. So I assume these are the 2 VR sensor provisions. But which is which ?
- Jorgen says: IIRC it's the front sensor that is the timing (crankhome) pin (the sensor closer to the top)
- very likely so!
- the front sensor is the 1-pulse than
![[pic15]](http://vems.hu/files/MembersPage/MarcellGal/Audi/clutch/bay_no_engine_0015.jpg){kind=link}
![[pic14]](http://vems.hu/files/MembersPage/MarcellGal/Audi/clutch/gearboxshaft_0014.jpg){kind=link}
![[pic17]](http://vems.hu/files/MembersPage/MarcellGal/Audi/clutch/flywheel_0017.jpg){kind=link}
We will have to scope it or verify via some other way.
Found some metric (M6?) screws, used a washer and an extra female to make it proper length, and mounted sensors in the 2 holes close to each other.
Teppo said:
- grey one reads flywheel teeth
- black reads the pin behind the flywheel
That is, with normal mounting. I will have to check (and document) if I followed the standard (colors: no other difference between sensors), or got it with colors swapped.