PD cam sensor normal readings
It seems odd that the car will not run with the cam sensor unplugged. My 2005 PD will; it just takes a bit longer to crank.
The cam sensor sees a wheel behind the cam sprocket. It is not a toothed wheel in the normal manner. It has pieces of metal of varying width in places, with other pieces of varying widths removed. This lets the sensor report to the ECU not just how fast the cam is turning, but also which cylinder is presently at TDC.
As I said, my 05 pd will run with the sensor unplugged. The PD educational pdf in the photo section indicates that is normal. (By the way the BEW will not run without the crank sensor, but the BRM can run as long as either the crank or the cam sensor is working.)
The cam sensors normal resistance is greater than 6 Mohms for any and all pins to ground, with either positive or negative ground.
The sensor pin to pin readings were all greater than 6 Mohms, with the following exceptions:
Pin 1 neg to pin 3 positive = 2.89 Mohm.
Pin 2 neg to pin 3 positive = 1.95 Mohm.
The plug (wiring harness) pin to ground(negative) readings (key off) are :
pin1 = 26 to 50 ohms (varying, seemed mostly 50 ohms)
Pin 2 =4.35k ohms
Pin 3 = 0 ohms.
The plug (wiring harness) pin to ground (negative) voltage readings (key on) are:
Pin 1 = 12.5 volts
Pin 2 = 5.0 volts
Pin 3 = 0 volts
When I started the car (yeah it runs) with the plug off and checked the voltages again, the only one that changed was:
Pin 1 = 14.3 volts.