V1 LeoZug's Montana Street Goblin - '05 Cobalt SS donor

[Gtstorey]

I got my wiring diagrams from https://mcdowellpubliclibrary.org/chilton-auto-repair/
Navigation isn't the greatest but it's free

Does it also include the OEM DTC diagnostic procedures and descriptions?

Edit- it appears that it does.

 

[Rauq]

I downloaded the '05 an '06 manuals, I will look through them when I have the time if nobody else beats me to it.

 

[Leo Zugner]

Ok thank you. I searched for the manual for a second and didn’t find anything. I’ll keep looking. I don’t feel very helpful in this process. Not sure I’d know what I was looking at if I found it.

 

[Gtstorey]

Ok thank you. I searched for the manual for a second and didn’t find anything. I’ll keep looking. I don’t feel very helpful in this process. Not sure I’d know what I was looking at if I found it.

where did you search and not find it?

 

[Leo Zugner]

https://mcdowellpubliclibrary.org/chilton-auto-repair/

I put 2005 Chevy Cobalt SS in the search.

 

[Leo Zugner]

Any advice on how to find what I’m looking for? I clicked that link and everything I search for comes up with “sorry no entries were found”

 

[Gtstorey]

Look for this paragraph and click on the link and enter the password.

To access the database from home, select ChiltonLibrary.com and type in the password: nclive001

What is the saying from 30 years ago? Reading comprehension is fundamental?

 

[Leo Zugner]

I don’t know if the insult was helpful.

 

[Leo Zugner]

I found some diagrams on that site and I understand zero percent of it. I guess I’m done with the car for now. But I guess I learned about reading comprehension.

 

[Ross]

Go to youtube, and search "how to understand car electrical diagrams".
You will find mechanics who have educational videos.

Then come back here, post a picture of your diagram, and start asking specific questions.
Building a kit car is a challenge, and that challenge should expand our abilities

 

[Rauq]

I'm not sure how DF would have wired your '06 fuel module connector on an '05 harness but two of your wires should land on the PCM at C1-12 and C1-29. I guess you can disregard the color callouts as your wiring at the fuel module connector isn't standard anymore. While the first diagram diagram says C1-29 is the sensor signal and C1-12 is the Low Ref...

These snippets say the reverse:

One of Pins 12 and 29 should also have continuity to ground, I think, based on my incomplete understanding of Low Ref... but probing the harness connector probably won't tell you anything as the ground is on the PCM side, and the PCM may not be fully grounded with the connector out. I'm not sure you can probe the pin with the connector installed. On one hand, it may not matter if you get those two wires swapped, except that the below highlighted branch is also connected to the fuel tank pressure sensor, but I don't think you or anyone else is running this, so it may be of no consequence.

Then you should have one wire in the 4 pin connector that goes to ground, and one that goes to C2-D4 on the fuse block. I believe you were previously linked to how/where to probe in the fuse box for the power wire that goes from the relay to the pump, that should tell you which wire is power for the pump.

Additional post incoming with more summarized thoughts.

 

[Rauq]

So on this connector, in position 3, pin in the loose wire that you have that has continuity to ground.

In position 1, pin in the loose wire that has continuity to the relay in the fuse box.

In position 2, pin in the loose wire that has continuity to PCM C1-29.

In position 4, pin in the loose wire that has continuity to PCM C1-12.

If you have any other questions or need clarification on anything, just let me know, including how to probe for continuity.

I believe in you, I just think you're still behind the curve- I think just ahead of you is an Aha! moment and then it'll click and you'll be better able to ask the right questions and understand the answers and guide your investigations.

One more post/thought incoming.

 

[Leo Zugner]

Thanks for sending. I ended up getting an OEM ‘06 fuel pump and new connectors to make the system more like DF wanted it to be. I checked the fuel pump with 12v and it worked so I just need to find out why the engine didn’t seem to be getting fuel. I crank it a bit and then check the schrader valve on the fuel rail and I don’t seem to be building up any pressure. Not sure if that’s to be expected?

 

[Rauq]

For everyone else reading, the '05 fuel pump connector situation is a great example of how unhelpful/misleading/incorrect/inconvenient the LSJ wiring diagrams are. In this example, there's wires that are referenced in once place but not fully explained elsewhere, wire colors that change based on description, and '06 references to ECM wiring, while all the LSJ's technically have a PCM and not an ECM.

I've noted this elsewhere, but if you're working on any LSJ wiring and you see a callout to ECM, STOP! It's not LSJ wiring!

 

[Rauq]

Thanks for sending. I ended up getting an OEM ‘06 fuel pump and new connectors to make the system more like DF wanted it to be. I checked the fuel pump with 12v and it worked so I just need to find out why the engine didn’t seem to be getting fuel. I crank it a bit and then check the schrader valve on the fuel rail and I don’t seem to be building up any pressure. Not sure if that’s to be expected?

On my '06 LSJ the fuel pump will run for about 5s with key on engine off once. To get the pump to run again, you'd either have to wait 10 minutes, or the PCM needs to see some RPM. Meaning, if you turn the key to on and leave it there, or cycle it off-on-off-on, you're not going to get any additional fuel pump priming beyond the initial 5 seconds. You can either manually relay the pump at the fuse box or turn it on in HP Tuners.

That being said, I don't remember an empty fuel significantly delaying my first startup.

See ^this^ note. You shouldn't expect more than a few seconds run time on the pump if the engine doesn't turn over at all. I want to say this should still be enough to get some fuel at the rail.

Do you know the fuel pump is running at all?

If it is, perhaps it's your fuel line plumbing? DF just posted an SS/SC fuel line instructional video:

 

[Leo Zugner]

Ok cool. I’ll check this out later today. Lonny thinks there may even be something wrong with my fuse box. The donor drove fine before I took it apart so I’m not sure why there would be an issue. Do you think I could put 12v to the fuel pump just to get some fuel moving through the system?

 

[Ross]

You could provide ground to pin 1, and 12V+ to pin 2 to get your fuel pump running.
PS: Every wiring diagram I have seen has the 2006 fuel pump connector wires wrong.
Below is the actual wiring for this connector.

 

[Leo Zugner]

Oh wow. Ok. Good to know. I confirmed my ground with my volt meter then looks at the other fat wire (assuming that’s power) and went from there.

 

[Gtstorey]

For everyone else reading, the '05 fuel pump connector situation is a great example of how unhelpful/misleading/incorrect/inconvenient the LSJ wiring diagrams are. In this example, there's wires that are referenced in once place but not fully explained elsewhere, wire colors that change based on description, and '06 references to ECM wiring, while all the LSJ's technically have a PCM and not an ECM.

I've noted this elsewhere, but if you're working on any LSJ wiring and you see a callout to ECM, STOP! It's not LSJ wiring!

Is this an All-Data problem or a GM service manual problem. I've always wondered how All-Data and similar programs get the data "traced". But the oem's make mistakes also and it's a pain when it happens.

 

[Rauq]

Is this an All-Data problem or a GM service manual problem. I've always wondered how All-Data and similar programs get the data "traced". But the oem's make mistakes also and it's a pain when it happens.

I've only been using All-Data / Charm.Li