What I Have:
2015 Corvette Stingray with a Haltech Elite 1000 controlling a port injection system.

Current Situation:
With Haltech harness unplugged from Haltech, the engine starts with RPM on the dash and in HPtuners.
With Haltech harness plugged into the Haltech and the cam sensor only connected to the GM ECM, the engine starts, RPM in HPtuners and Haltech but no RPM on the dash.
With Haltech harness plugged into the Haltech and the cam sensor connected to both ECM's, the engine doesn't start, In HPturners the Cam count channel goes up only by two during the whole time cranking.

Codes from GM ECM:
P0335 - Crankshaft Position Sensor A Circuit Low (Only on when Haltech harness is plugged into Haltech. Does not occur when Haltech harness unplugged.)

What I've tried:
Moving Cam sensor splice closer to the connector - Failed, monitored signal with Oscilloscope, with GM only, 5v clean signal, see fig 4, but with Haltech spliced in a 3v drop in the signal occurs, see fig 5, when the engine is cranking. See fig 7 for Haltech Trigger and Home settings.
Moving Cam & Crank splices to the ECM connectors based on this guide: https://www.corvetteforum.com/forums...minator-x.html -Failed, same result as specified in the current situation above. Only difference other than the location of the splices from the drawings is that the Haltech did not share grounds with those sensors. In the beginning, it did like the drawing shows.

Calling Haltech:
Advice given was to not share the ground from the hall effects sensors -failed
Get rid of Cam sensor to use batch injection over sequential injection -Success-ish, Engine started but did not have RPM on dash only in HPtuners log (OBD) and Haltech log.

Splicing method:
All connections are soldered and sealed with heat shrink. Wires are tinned and soldered together. Checked for strength. Minimal solder used to avoid adding resistance.

Questions:
Why is the Haltech causing such a high voltage drop on the cam signal?
I believe and will confirm this tomorrow that the crank sensor is also getting a voltage drop, if so, why?
Are my settings for trigger and home correct in the Haltech? The engine is a GEN 5 LT1

Drawings:
(Note: These drawings are to be used at your own risk if you are putting a Haltech in your car. Also, the TPS splice has changed to the accel pedal due to the TPS sensor using CAN bus on C7's)
Fig1:


Fig2:


Fig3:



Oscilloscope connected to Cam signal:
Fig4 (GM only):


Fig5 (GM and Haltech): (Sorry for the bad view just me in the shop.)



Haltech Settings:
Fig7:



To-Do:

• Connect the oscilloscope to crank signal to check for voltage drop or noise. Doubt there is noise, maybe a voltage drop.
• Regain sanity

Any advice or explanations is greatly appreciated!
Thank you!

 

Couldn't grab any with just the GM harness tonight. Signal looks noisy, probably because its low, and way too low, with Vmax of 177mv on the crank signal and Vmax of 174mv for the cam signal.
Crankshaft position sensor with Haltech harness plugged in:


Camshaft position sensor with Haltech harness plugged in: