Mike Stahl

Trying to build race car only things hooked up are everything on steering column shiftier bcm tcm ecm and everything on engine and trans all grounds no crank and no link with ecm do i need abs or airbag module?

Oldblue

Welcome to the site, did the donor car have ABS then yes you are going to need the sensors, and the airbag is a given unless you find someway to shut that off in the program, but I doubt it.

Mike Stahl

Why does it need them to run? With what I have hooked up it won't link to scan tool any idea why

843de

Basically you need the donor car's VIN, every possible module, and the wiring harness to make a GM CAN-BUS Duplexed electrical system work. They are not easy to work with, and some aspects are dementedly complex.

The fun part is getting every module to think they are still part of the donor vehicle, hence the need for its VIN and a Tech II scan tool.

Honestly, you'll be ahead in the game if you buy a copy of the donor vehicle's FSM(Factory Service Manual) on a CD Rom so you have the wiring diagrams, connector pin outs, etc.

Mike Stahl

thanks old blue and 843de for all your help i had everything i needed it was a running car and the guy i bought the parts off of kept saying oh you wont need this can i have it back lol and i didnt know it wouldnt run till i actually got it all back in a car again and i was trying to figure it out but i got it after running a resistance check between brown and brown/black wire in the scan port i got 120 ohms so so i knew i was missing a link to the computer so i pulled apart the harness and followed wires to the abs module plug and found 4 wires running to the plug but they never spliced together so there was my missing link to the ecm i cut the brown wires and wired them together cut the brown/black wires connected them together read 4 codes fine and it fired right up anyways i dont know if this will ever help anyone on here but i figured i put it out there and thanks again

Mike Stahl

i bought the hhr with a 2.4 ecotec for the donor engine and swapped it in a cavalier if you guys were wondering now i gotta figure out some ways to add more power im pretty sure stock it should run good

Oldblue

An Eaton supercharger will wake it up, or even just a good tune

Mike Stahl

it has a box wired into the mass air but i dont believe they do anything it has to appear stock whats a cheap way to tune it i heard tuning returnless systems are pretty tough

Oldblue

Not one of those "trick the computer " splice in boxes, a real tune from HP tuners or Trifecta.