A little back story. Wiring harness is of a GMPP LS3 controller kit, originally used on an '08 58x LS2 motor (with LS3 heads). I added wiring for reverse lockout & PWM fan. Come to find out, the GMPP ECM does not have the ability to control the PWM fan, so I got an '09 CTS-V ECM , (After adding an LSA supercharger & LS9 cam. Original non supercharged engine ran with the GMPP ECM. Now I am getting P0016 code for cam position (with both the CTSV & GMPP ECM).

I tried a different cam pos sensor, no change. Checking wiring at the Cam position sensor itself. I found this diagram for wiring to it.


My A & C wires looks backwards, but when I check voltage at the connector (key on, not running) that goes into the cam position sensor, I get this:


I tried different ECMs, one production '09 CTS-V E67 & the other GMPP E67, with same results.

The 14mV thew me off, .014 volts? And why dont I see +12v on it?

 

Pinouts for a Gen IV engine with 4-pole cam speed sensor itself are:

Pin A: +5V reference from ECM
Pin B: Ground at ECM
Pin C: Cam speed input signal to ECM

However, the Gen IV engine has a short pigtail in a curved metal bracket that swaps pins A and C at the connector near oil pan (and it's a different style connector too). Why they do that I'll never know. If you wire directly to the speed sensor then use the pinouts listed above. If you wire to the pigtail in the metal bracket, then swap pins A and C.

And just for reference, pinouts for a Gen III engine with 1-pole cam speed sensor are:

Pin A: Cam speed input signal to ECM
Pin B: Ground at ECM
Pin C: +12V from ECM