Thread: Topped swapped 06 GP now wont start and scan tool wont comm with ECM

Originally Posted by Scottydoggs

check the fuse box for a blown fuse, the cig lighter fuse also works the obd2 port.

did you take the starter off? maybe the wires are on wrong? you got 3 grounds on the trans bell housing? maybe one broke off? or the loop is loose, we've seen that one before.

as far as the throttle response, you got all the vac lines hooked up correctly?

I will recheck all fuses. but on the wiring diagram for my 06 the power to the DLC comes from the Onstar ALDL fuse and has power at fuse and orange wire. i have tested the pin at the DLC to ground and get source voltage. The scan tool turns on but just does not communicate.

Yes the starter was off and i verified the wiring. my model does not have ABS so one of the grounds that goes to the transmission is not on my model like the ones with ABS. Good question on the vacuum line routing i will verify that next.

A little side not though on my top swap i did not swap over GTP wiring. so i dont have the wiring for the TC on the BBV and using the stock Map wiring to the 2 bar map from a GTP and do not have the BAP sensor wiring/ sensor either. COuld that cause an issue i informed zzp this when i sent the ecm in for tuning.

I fixed it it was the wiring harness. I reached out ot Turbo Tim at ZZP and he advised that he had tuned the ECM with an 05 GTP bin file. I went to Morad and purchased a 05 GTP Engine harness and installed it on Wednesday night and it started on its own and idled fine. a little loppy due to the VS cam. Last night i was running it and got code P0336 for Crank sensor. I think i may have chaffed the wiring at the CKP it is hard to keep it tucked with the Super belt in pulleys in the way.

Originally Posted by dbextreme

I'd check your wiring. When I did my top swap I purchased the swap kit that came with the MAP stuff and the BBV sol pig tail. The MAP harness was wired backwards (outer pins were swapped so instead of wiring A -> A, B -> B, and C -> C it was A -> C, B -> B, and C -> A) It caused mass confusion and I didn't notices it until I broke out the volt meter and started testing ends... Heck it was throwing a code for the gas tank... LOL But something simple like that can throw everything out of wack.

Also I have my BBV hooked to run complete off vacuum. Here is a diagram of what mine looks like. I assume you swapped a Gen V top on your L26 and not the Gen III so yours will be a bit different but around the BBV should be the same..

http://i698.photobucket.com/albums/v...220_172842.jpg

What I'm wondering is it being an 06, is it a security thing? My Intense PCM came with the VATS/Security and Crank Pos Sensor relearn procedure.