devianteng
Well-Known Member
Hi all.
Donor is an 07 SS/SC, and I did my wire harness work back in Jan/Feb. Just the other day I did my first start, so overall things are good. I have a handheld scanner and was able to pull a few codes (mostly evap related, but I may have a dead/dying MAP sensor, or connection issue -- will troubleshoot that separately). Anyway, I grabbed my MPVI2 today, updated HPT on my laptop and went out to the garage. No matter what I did, I couldn't get HPT to connect to the ECM. I only had a few minutes to mess with it so it definitely could be an issue with my HPT setup, but I wanted to talk about the green data wires and the GMLAN wires.
I saw a mention previously in another thread that the SS/SC had a green data wire that you weren't supposed to cut, but the video doesn't talk about it. I'm 99% sure I connected all green wires to each other, and I'm second guessing myself if that was the correct thing to do. Also, I'm pretty confident that I connected up the GMLAN wires correctly, but I'm wondering if there are easy ways to validate that these things were done correctly (I recall reading something about checking resistance across the two LAN wires on the OBD connector, which I was getting like 61ohms across).
Any advice or tips how to start investigating/troubleshooting around data connectivity issues? Would I be able to start the car right up and see output on the dash if the data wires were wrong somewhere? I feel like if I can pull DTC with one scanner, then things should be good with HPT to connect but any advice is appreciated!
Donor is an 07 SS/SC, and I did my wire harness work back in Jan/Feb. Just the other day I did my first start, so overall things are good. I have a handheld scanner and was able to pull a few codes (mostly evap related, but I may have a dead/dying MAP sensor, or connection issue -- will troubleshoot that separately). Anyway, I grabbed my MPVI2 today, updated HPT on my laptop and went out to the garage. No matter what I did, I couldn't get HPT to connect to the ECM. I only had a few minutes to mess with it so it definitely could be an issue with my HPT setup, but I wanted to talk about the green data wires and the GMLAN wires.
I saw a mention previously in another thread that the SS/SC had a green data wire that you weren't supposed to cut, but the video doesn't talk about it. I'm 99% sure I connected all green wires to each other, and I'm second guessing myself if that was the correct thing to do. Also, I'm pretty confident that I connected up the GMLAN wires correctly, but I'm wondering if there are easy ways to validate that these things were done correctly (I recall reading something about checking resistance across the two LAN wires on the OBD connector, which I was getting like 61ohms across).
Any advice or tips how to start investigating/troubleshooting around data connectivity issues? Would I be able to start the car right up and see output on the dash if the data wires were wrong somewhere? I feel like if I can pull DTC with one scanner, then things should be good with HPT to connect but any advice is appreciated!