2003 Cadillac CTS PO343, cam sensor high voltage.

Yes. Test light lights on pink Wire at cam sensor. We have solid voltage

Only one camshaft sensor on this vehicle

I’d leave that ground hooked up pull cam sensor wave it in front of a piece of metal. Wrench screwdriver etc. see if anything changed. So what do you have on the signal wire only?

I found what cause the problem to pcm. Unfortunately the pcm did not survive it. As you can see cam sensor harness was shorted. Shorting battery voltage to low ref and cam sensor signal.

Can’t even communicate with pcm anymore. Replacing cam sensor and new pcm is getting flashed now. Out of curiosity I started to check what sensors I could reach easily for internally shorted sensors and found cam sensor shorted internally showing continuity on pin 3 and 2 and 1. Split harness open and found this.

Will update

Ladies and Gentlemen we have fixed this one. After replacing cam sensor and new Pcm problemo fixed.

On this vehicle the reason it has 12 volts on pink wire is so that when cam crosses the sensor it pulls it down to 0. As you can see it will pull it from voltage to 0 on this one. We initially thought it was a 5 bolt pull down but it’s 12 volt pull down on this one. Vehicle is running and problem fixed. Shorted cam sensor ruined the pcm on this one

Here is a better view of cam sensor waveform after fix

Thanks for the fix info... GM does use 12v or 5v pulldowns and with this one I noticed the wire colors are pink, green and ? for the CMP. All my data has them as pink, brn/why and tan. Was that an aftermarket pigtail? What engine was that?

It was not aftermarket. Something about mid year production but it was pink for 12 volt fused power, brown/white for signal and tan/black for low ref. You are right about both 12v and 5v pull downs. It’s not same on all. I had a 2014 suburban that had a 5v pull down on crank sensor