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[STMO123]

Where is it, and what does it do? :-?

[Taxi_Driver]

Its the crank/cam sensor.

Its the type of of technology used for the sensor.....im fairly certain both are hall effect type  

[STMO123]

Ahhhh....Thank you TD

I knew the principle of the switch but didn't know its practical application.

[Taxi_Driver]

Your welcome m8  

I must have been right as no one else has jumped in, to correct me  

Glad you got up early to ask the question and me up early to answer it b4 anyone else had the chance  

[TheBoy]

Vx call cam sensor hall effect, and crank sensor is a crank sensor.  So if when looking up fault codes it says hall switch, it is cam sensor.

[Chopsdad]

Where is it, and what does it do? :-?

It's in the hall and it turns the lights on and off.  

Oh come on you asked for that one  

[STMO123]

Where is it, and what does it do? :-?

It's in the hall and it turns the lights on and off.  

Oh come on you asked for that one  

Homebase has 20% off, not just wednesdays, most of the time

[nixoro]

Vx call cam sensor hall effect, and crank sensor is a crank sensor.  So if when looking up fault codes it says hall switch, it is cam sensor.

Ahh thats answers a question I asked in another thread, all the same its good to know.

[v6man54deg Geffd]

They both use the 'Hall magnetic effect' basically a magnet passes a metal lug and produces a magnetic signature - this is used by the cam sensor to denote which cylinder i.e 1or 4 is coming upto TDC - and the crank sensor uses it for speed and crankshaft position - theres a transmitter disk on the crankshaft with 58 slots and one big one (1&4 reference point)

Sorry to be a spotter lol

Its the crank/cam sensor.

Its the type of of technology used for the sensor.....im fairly certain both are hall effect type  

[TheBoy]

They both use the 'Hall magnetic effect' basically a magnet passes a metal lug and produces a magnetic signature - this is used by the cam sensor to denote which cylinder i.e 1or 4 is coming upto TDC - and the crank sensor uses it for speed and crankshaft position - theres a transmitter disk on the crankshaft with 58 slots and one big one (1&4 reference point)

Sorry to be a spotter lol

Its the crank/cam sensor.

Its the type of of technology used for the sensor.....im fairly certain both are hall effect type  

Agreed they are both probably Hall Effect, but in all the docs I've seen, fault codes relating to Hall sensor are referring to cam sensor.  Fault codes relating to crank sensor are call crank sensor in these docs...

[Marks DTM Calib]

Its legacy......the early distributor based units had a hall sensor in them to trigger the ignition module....as this is effectively cam speed (and on Vx over head cam units it was mounted on the end of the cam)...hence it always was a cam sensor...

For info, the hall effect operates by passing a small current through a slab of silicon from say North to South, as a piece of ferrous material passes, some of the electrons passing through the silicon are dragged to either the East or West side (dependent on direction of rotation), if there is a contact there you get a current flow through it and hence a signal.....

This was pretty evident on the failed cam sensor that Taxi driver sent ....it had a small circuit board with a few capacitors on it which were connected to a 4 contact hall sensor (slab of silicon), in this case both east and west contacts were connected together.

[TheBoy]

Its legacy......the early distributor based units had a hall sensor in them to trigger the ignition module....as this is effectively cam speed (and on Vx over head cam units it was mounted on the end of the cam)...hence it always was a cam sensor...

For info, the hall effect operates by passing a small current through a slab of silicon from say North to South, as a piece of ferrous material passes, some of the electrons passing through the silicon are dragged to either the East or West side (dependent on direction of rotation), if there is a contact there you get a current flow through it and hence a signal.....

This was pretty evident on the failed cam sensor that Taxi driver sent ....it had a small circuit board with a few capacitors on it which were connected to a 4 contact hall sensor (slab of silicon), in this case both east and west contacts were connected together.

Surely not, as TD's dealer had sworn he'd replaced it  

[Marks DTM Calib]

They are supposed to be shorted together, from what I can tell the actual fault was down to a dodgy bond wire to the silicon slab (it would have been very intermittent and probably temp related).

See, I knew my old materials science lessons would be useful one day. Interestingly the guy who taught is a leader in the new LEP (light emitting polymer) technology which is likely to make LCD's obsolete (it can be printed on to sheets using ink-jet techniques)

[STMO123]

So....east and west contacts were shorted together because engine would only ever travel in one direction?

Is this basically the same principle as a magnet passing through a coil and inducing an electrical current?

[Taxi_Driver]

They are supposed to be shorted together, from what I can tell the actual fault was down to a dodgy bond wire to the silicon slab (it would have been very intermittent and probably temp related).

See, I knew my old materials science lessons would be useful one day. Interestingly the guy who taught is a leader in the new LEP (light emitting polymer) technology which is likely to make LCD's obsolete (it can be printed on to sheets using ink-jet techniques)

Can i have it back now that youve fixed it Mark