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[EDDY]

I've got an Opel comodore 2 ltr 1998 with the motor service light on.
checked the codes and they tell me an error on fuel injectors 1-2-3 and 4 but that seems normal as the car is running on lpg. the other code is for the camshaft sensor .
I checked the output of the sensor on the scope and that gave me a Sinus wave form of 3 Volt p/p
should that be a square wave?
Also, should there be a 5 Volt supply to the sensor ? there are three wires .
Earth- Output - and supply ?
please somebody, I've got my knickers in a twist.

[tunnie]

I've got an Opel comodore 2 ltr 1998 with the motor service light on.
checked the codes and they tell me an error on fuel injectors 1-2-3 and 4 but that seems normal as the car is running on lpg. the other code is for the camshaft sensor .
I checked the output of the sensor on the scope and that gave me a Sinus wave form of 3 Volt p/p
should that be a square wave?
Also, should there be a 5 Volt supply to the sensor ? there are three wires .
Earth- Output - and supply ?
please somebody, I've got my knickers in a twist.

If the fault codes show cam sensor, then its at fault, replace with a geniune sensor if you can get one where you are 

[3.0V6]

Camshaft is usually (not always) a hall effect device, three wires as you say, power (usuall 5V), ground and then the output, which as you say is a square wave as seen on the scope.  What scope are you using out of interest?

Just re read your post and if your engine is a x20xev it could be using an ac excited sensor that is pretty unique to that model (thank god).  Try using another channel and connecting to another wire, you should end up with two sinusoidal waveforms slightly out of phase.

Hope that helps