Hi there,

Not sure if anyone has come across this issue before, but I just put together an LS1 engine and I'm running an LS2 cam with the correct sprocket, timing cover and etc. The car starts right up and idles fine, my tach works correctly but when I checked for the codes, it was throwing a cam code for high voltage. I've searched around but haven't found where anyone has solved the issues. I did buy a brand new AC Delco cam sensor that was correct for an 05 GTO according to Rock Auto. I've seen where people have mentioned a CASE relearn which I can do through HP Tuners, but not sure if that is really my issue? When I assembled the motor with the new cam gear I made sure to torque it properly and used blue Loctite.

I'm going to confirm tonight if the new sensor is too close and possibly touching the cam gear, if the wires are pinned properly(I believe I switched the two outer pins), and if the pins are pushing out and/or too loose.

Does anyone else have anything that I should check? Also, has anyone been in this situation and fixed their issue?

Thanks,
Ryan

 

scope the sensor to check it is sending a valid signal.

That will prove wiring and function.

 

Thanks for the reply. Sorry for my ignorance but what does that mean exactly? Can I do it with hp tuners?

 

Then it'll probably go over your head lol...

Ideally test with an oscilloscope....but that's probably out of the question from the above answer..no idea on HPT...doubt it but I've never used it.

You could test with a multimeter between sensor output and sensor ground, and as you rotate the engine by hand, every 180deg camshaft rotation, ie 360 crank rotation the output will switch between 5v and 0v with a 1x camwheel which you should have installed.

This video explains the sensor side of things ( generic, not LS specific )


If you can remove the sensor easily...testing would be similar manner. As you pass a ferrous metal object over and away from the sensor, you should see it's output change from 0v to 5v. If it does not, then it is not wired correctly or not working correctly.

 

Or same again.....except in the case of a 1x wheel, there is only 1 large tooth and 1 large gap for every rotation. LS crank/cam is 3 wire hall sensor

 

I don't have access to an oscilloscope, but I'm pretty good with wiring so I will use the method of testing using a multi-meter. Thanks for the youtube vids, I will check those out later today.

 

First thing I would check is wiring. Especially if everything was working before I would suspect a wiring issue when you changed sensors and timing covers. Maybe something got pinched or shorted some way.
There are some things you can scan for the cam sensor in HP Tuners 4.x but I haven't needed to use them. They may not work with your vehicle / OS but they are options in the scanner.

There is no adjustment on sensor depth so I see that as an unlikely cause.

 

I had a little time over the last few days to do a little trial and error as well as take some pictures. And yes, all the wiring was working appropriately and functioning 100% with the 5.3 motor that I pulled out. My biggest issue is that I cannot seem to find a definitive answer on what the correct wiring order should be for the cam sensor I've got connected currently. Here is a picture of the wiring as it is now.

A - Red - 12V reference
B - Pink/black - Sensor Ground(low reference)
C - Brown/white - Cam Sensor Signal



And here is the wiring on the front cam sensor. Hard to see, but I switched the A and C wires as I had read on several sites.



Can someone please review their wiring or provide a picture of the front cam sensor with the correct wiring order?

 

It is easy to test...so test if it is working, that will prove both wiring and functionality. Digital meter between B + C set on DC volts and rotate the engine by hand and you should see it switch 0v/5v as the large tooth passes by the sensor, every 180deg of camshaft rotation.

 

https://ls1tech.com/forums/cadillac-...-ls2-swap.html

 

I'll try and get my ohm meter out tonight and check my connections. What confuses me is when I look at the pinouts for the LS3 sensors themselves it showing a different order C - A - B, but when I see a schematic like you posted above it shows in order A - B - C. I see where the wires coming out of the sensors themselves are oriented in a different order. What I would like to see is someone that has what pins need to go in which orientation top to bottom for the LS2/LS3 front mounted cam sensor. Not necessarily the colors, but what it needs to see reference wire, signal wire, or 12v.

 

mine looks like yours except I have an orange wire for 12v ref and you have a red wire I can take a pic if you need it.

 

oh and I have that short extension that runs along side the front cover if that make a difference.

 

The extension is just a pass through, it doesn't change the order.

I wired mine according to a schematic I found and it's been working perfectly for over two years. I used a connector I took from something I deleted so I couldn't go by colours. I've learned to never trust the colours on a schematic anyway as they are for only reference. Sometimes the suppliers sometimes change during a production run and with that change the colours do too. Other times the colours aren't vibrant or don't hold up well to UV, solvents or other things.

 

Update! I had to fire up the car last night to check the clutch after I bled it and figured it was worth a shot to just swap the outer two wires to see what would happen. I figured if I kept record of the wires I swapped eventually I would figure out the order or I would figure out a had a defective brand new sensor. Well swapping the outer two wires was what I needed. So for anyone else out there, the wiring order looking at the sensor from top to bottom is below and like what was said above disregard colors as I swapped around the wiring in the extension harness I made:

Top - Cam Sensor Signal
Middle - Sensor Ground(low reference)
Bottom - 12V reference

Thanks for all the help. That's what I love about LS1tech, people always willing to help.

Ryan