V1 Engine wiring questions

[PHENDERSON]

I'm in the process of attaching the harness to the engine and I have most of it figured out. There are a couple spots I'm unsure of. First one is a short ground wire that's close to the starter motor. I already have a thicker ground bolted to the other side of the starter motor. Any idea where the smaller one goes?

Second question is the thick wire that was attached to the starter, does this go to the fuse box and the long one to the battery?

Third question is I have 2 connectors that use to go to the radiator fan, what happens with these

Final question, does my wiring to the starter look correct? The wire to the alternator is attached to the top left.

Thanks in advance!

 

[Ark :D]

1) Not sure, off the top of my head. Probably a safe bet to ground it.

2) The shorter segment goes from the pole on the starter to your fuse box

3) The light blue gets extended to the front to run your rad fan. The gray one you can cut out or let it hang there, either way.

4) They explain the starter wiring in this video, a bit after the 6-minute mark:

 

[Ross]

There are no ground wires on the starter. There are 3 positive wires, and the engine block is ground. On the starter post that goes to the battery +, is also a wire that goes to the fusebox in the back, and possibly a wire that goes to the alternator. The stock Cobalt engine block had a short heavy wire that went between the engine block and the body... but since our Goblin has solid mounts to the block, it isn't needed anymore.

 

[PHENDERSON]

That all makes sense, thanks. I think im just going to attach that loose ground along with the other one that is bolted to the block.

 

[Sluggonaut]

I am about to get to where you are at and I'm wondering why we don't strip and re-work the engine harness like we did the others. In looking mine over ahead of time, I am a bit worried even with all of my labels. I'm bookmarking posts like these as I will likely have the same questions.

 

[Gtstorey]

The engine harness would need very little, if any, modification but if it’s in bad shape, it might be a good idea to strip it down and make necessary repairs. Mine had numerous badly reworked connections and burnt wires.

 

[PHENDERSON]

I have this connector near where the O2 connector is and I labeled it "air bag". Anyone know what this is for?

Also, I was looking at the main harness connectors at the engine side and I have this one labeled "power steering". Is this a fuse box connection?

And finly this connector near the ac compressor, any idea what this is for?

I keep thinking im going to mount the engine "today" then run into a bunch more questions. Some day.

Thanks again!

 

[Desert Sasqwatch]

Not an airbag connector, those were all yellow connectors.

 

[Ark :D]

Second O2 sensor.

Power steering, yes. It goes to the fuse box.

Not sure on the third.

 

[Gtstorey]

Wire colors and end view help identify connectors.

 

[r3drckt]

3rd is also AC compressor. There were 2 connections to it

 

[PHENDERSON]

This place is great. OK so first one is a 2nd O2 sensor, 2nd one goes to the fuse box, and last one is ac compressor and can be removed.

Do we still need the 2nd O2 sensor?

 

[Gtstorey]

You only need the 2nd o2 if you need to pass emissions testing/inspection in your area.

 

[r3drckt]

And that AC one can be used for AFR gauge if your car didn’t have one initially

 

[Rauq]

And that AC one can be used for AFR gauge if your car didn’t have one initially

I'd like to emphasize this. I don't know what your donor is (see the link in my signature to update) so I can't speculate if you're likely to want or need to get into tuning, but the AC pressure sensor signal wire is the easiest way to get an aftermarket wideband O2 sensor's data into HP Tuners.

 

[PHENDERSON]

I also have an 06 SS/SC and I completely rebuilt my engine and put in all kinds of performance upgrades wherever available so I think this is a good idea for me. Can you explain how it works so I can set it up correctly?

 

[r3drckt]

@Rauq, that’s all you, bud! I haven’t gotten this far yet in my build so haven’t researched your thread on the install (what type of AFR gauge, wiring, importing in HPT)

 

[Sluggonaut]

I just added a serial port to my AEM Uego wiring to get data into HPT. How exactly can you do that from the AC pressure sensor?

 

[Gtstorey]

I think that HP Tuners will read the voltage from the Pressure Sensor so you connect up the wideband to that and convert that voltage to A/F ratio.

 

[Rauq]

On an '06 LSJ at least, the red/black wire at the back of the refrigerant pressure sensor is the signal wire. On my Innovate MTX-L wideband, the yellow wire in the pigtail is an 0-5v output. I had to run a wire from the back of the wideband gauge at the front of the car to the splice point near the engine harness connector in the back of the car.

Then in HP Tuners you set up two custom math parameters (which I believe you have to do anyway) for Wideband AFR and Wideband AFR error using the 7101.10 parameter which is AC Pressure Sensor voltage. From there it's the normal process of adding AC Pressure Sensor and Commanded AFR to your logged PIDs and the histograms for AFR error vs KPA and RPM for VE tuning and vs MAF Freq for MAF tuning. I'm not an expert and a lot of this has been covered elsewhere but I can also post more concise and in-depth info if needed.