I have a 96 Disco I that threw a cam shaft sensor code. (P0340) I have tested it but am not sure of the results. It has three wires, Red Blue and Brown. I read that the brown wire is the ground. (It was not Rover specific) The Ohm reading between the brown and red was 1.969 ohms, and between the Blue and brown was 0 ohms. Did I test it correctly and if so with the 0 ohm reading is the sensor bad? Through my general research I have read that a 0 ohm reading means an open circut and bad sensor.

 

This is a Hall Effect sensor, so it won't have resistance in a linear fashion like a coil or resistor style sensor. The voltage of you meter, and lead polarity will impact readings. Open would equal what ever reading is displayed when probes are not touching anything. Short is the reading displayed when probes touch together.

 

Zero Ohms is never an open circuit in my 40 years of using ohm meters.

Open circuit = a side ways 8 (infinity) Depending upon the meter that can vary but like Savannah said leads not touching display equals open circuit unless the air is conductive.

Leads touching equals a short circuit, the only thing you can read is the lead resistance. With the older style meters, you could "zero" them out. Some of the digitals will read a slight resistance depending on the R scale selected.

Digitals will often flash on a open circuit indicating OVERLIMIT or OL