I just got my pcm back from zzp for my l67 swapped 98 gp gt so I hooked it up started the car an 5 min into running I got the p0118 code temp sensor is reading -38 degrees. The car I bought an took the motor an trans out of didn't have an engine light on I drovea the car approx. 28 miles before purchasing an no CEL. So I Swapped the sensor in from my l36 still no luck -38 degrees so I bought one from napa still reading -38. I have a cheap non digital ohm/volt meter I set it to the 10v setting tested the connector koeo an koe on the tester isn't great appeared to read around 5v which mean I have power there how do I test the ground or could this be a mistake from zzp?