Project Undertow #388

[Ross]

I get 61.5 ohms at the OBDii port on my LSJ, with the key off.
At least I do when the power steering data connector is pushed in. I see it changes if I pull on that connector... so I need to fix that.
If you turn the key on, of course data starts flowing on the GMLAN, and the meter goes all over the place.

 

[Gtstorey]

61.5 sounds correct for the two resisters, but 74 sounds to high. I don’t know if that additional resistance would be enough to cause a problem. But it might.

 

[Dominicnicklyn]

I've decided that I'm pulling the harness out for the 4th time. I'm going to ensure all low and high speed data wires are present where needed.
I'm going to repin all the low speed wires and ensure data flows as it should.

I'm now getting mixed coms with modules using Tech2win. I'll run a test and I won't have come with the ecm, then do another test and other modules won't have coms and the ecm will. I'm assuming I wired the low speed wires incorrectly due to being a 06 LSJ.


Does anyone know all the module that get tied together (green wires at end of video)?

 

[Dominicnicklyn]

I'm starting to make progress with the rear suspension. I found some knuckle/strut bolts online and I took a trip to the junkyard and got some bolts I couldn't salvage from my donor.

If I get my wiring figured out I should be able to install the center colum and set the car down on its own suspension

 

[Ross]

I traced the low speed LAN wires.

 

[Dominicnicklyn]

I traced the low speed LAN wires.

Ross.

YOU ARE MY SAVIOR

 

[escapepilot]

All of the low speed LAN get soldered together EXCEPT for one of the two coming out of the OBD port on the LSJ version. I don't recall which one at the moment that gets left alone.

 

[Dominicnicklyn]

So, updates on the build

I pulled the harness back out of the car and inspected the low and high speed data wires again. I re-soldered the high speed where they were combined in the build guide due to now having better tools and solder. I rechecked continuity with the low speed and it all checks out. Also inspected plugs and pins and nothing unusual stuck out. Hopefully sometime in the next couple days I'll get to throw it back in the car and try again.

I also found some wrx wheels with new all season performance tires for dirt cheap. Only issue was that they don't fit onto the cobalt hubs. I went the easy route and bought some decent wheel spacers that eliminated that issue. Now I have clearance when turning full to the left and right even without the rack limiters.

I still need to...
• solve no start issue
• mount a2w intercooler
• find some rear hub bolts
• tidy up the brake and coolant lines
• fuel pump wiring and lines
• parking brake
• install df shifter
• diy alignment
• wire in lights and dash buttons
• firewall panels
• mount seat and 5 point
• solve clutch line issue (simple)
• buy windscreen and wing uprights

 

[comegetjoe]

All season tires... get rid of them. Where did you buy your spacers?

 

[ah.b.normal]

I still need to...
• solve no start issue
• mount a2w intercooler
*************• find some rear hub bolts************
• tidy up the brake and coolant lines
• fuel pump wiring and lines
• parking brake
• install df shifter
• diy alignment
• wire in lights and dash buttons
• firewall panels
• mount seat and 5 point
• solve clutch line issue (simple)
• buy windscreen and wing uprights


[/QUOTE]
IIRC you are in Barbados?(or someplace equally far away.) You stated you need hub to spindle bolts? I go to yards to find little bits for my projects so I pick up after others have disassembled to get what they want. I actually have 3 of those "blue" bolts, maybe six? I would gladly mail them to you(UPS, FED/EX or USPS) if you'll cover shipping and I will accept a small fee($10-$20) for my work. You pay me after you receive the parts with Visa gift cards, as I don't expect any transaction to be over $200. I figure if it works for criminals trying to bilk folks out of big bux it will work for these little sums I get for finding little car bits. If somehow the item I send is not what you wanted, well, we'll discuss that IF it happens.
I am not a business, I just like helping out Goblin builders. Look at my Car on the forum in Other Builds(GOB-BALT) and if you read all of that stuff it will help you understand why I help. Need other little bits? Make a list and I'll do what I can to find them and send them your way. I'm not going to mail a sub frame but one of those big subframe bolts?, sure! Little wiring plugs, sure! A fuse box? maybe? A power steering unit, nope, too big and heavy, the nut for the steering wheel, sure. Send me a message in "conversations", I'll see it faster there than in this post.

 

[Dominicnicklyn]

All season tires... get rid of them. Where did you buy your spacers?

Spacers are from Amazon, I can find a link and put it here if you want.

Tires are just to get it on the ground and inspected. I'll have a nice set of R1R's but they are expensive and will have to come later.

 

[Dominicnicklyn]

So, got to spend some time in the garage. I mainly cleaned while I brainstormed on what to do next.

Tech2win says I have no coms with the EPS module again. I played around with it for a while longer and got it to display live data from the other modules. Does this mean that data is working on the high speed? Or would this data come from the low speed?

I noticed that the EPS doesn't tie into the low speed. Could this be a sign that I have a high speed issue?

So, with the throttle body and accelerator pedal connected properly the butterfly doesn't move. I belive I read somewhere that this would mean a data or ground issue.

 

[Gtstorey]

I think typically the EPS is the first thing in the chain of modules. If the other modules are there, then nothing wrong with the high speed wiring. The eps isn’t talking to the high speed. Since you have had a problem before, you need to confirm the other wiring.

 

[Ross]

The EPS (electronic power steering) doesn't have the low speed LAN/serial data bus wire going to it... only has the high speed wires.

However, AllData does say it uses the serial data bus... so it must be using something else (BCM?) to transfer the data to the serial data bus:

Power Steering System Description and Operation
The electric power steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the body control module (BCM), power steering control module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, serial data bus, and the instrument panel cluster (IPC) message center to perform the system functions.

The high speed LAN data flows from the OBDii port to the EPS module, to the BCM, then to the PCM.
I have had a bad EPS cause me to loose high speed LAN data... was a pain to figure out the issue, but a used $60 EPS fixed the data issue. Not sure that this is your issue, but you have eliminated a lot of stuff already.

 

[Dominicnicklyn]

The EPS (electronic power steering) doesn't have the low speed LAN/serial data bus wire going to it... only has the high speed wires.
View attachment 44984

However, AllData does say it uses the serial data bus... so it must be using something else (BCM?) to transfer the data to the serial data bus:

Power Steering System Description and Operation
The electric power steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the body control module (BCM), power steering control module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, serial data bus, and the instrument panel cluster (IPC) message center to perform the system functions.

The high speed LAN data flows from the OBDii port to the EPS module, to the BCM, then to the PCM.
I have had a bad EPS cause me to loose high speed LAN data... was a pain to figure out the issue, but a used $60 EPS fixed the data issue. Not sure that this is your issue, but you have eliminated a lot of stuff already.

Some serious info you just fed me. What exactly was happening with your car before you solved your EPS issue?

I have replaced it once but it was with a used module, it very well could be bad as well.

 

[Ross]

I was having intermittent issue where the power steering would cut out, the dash would go dead, and the key wouldn't start the engine.

 

[Dominicnicklyn]

If I were to conect the high speed where it enters and leaves the EPS module, essentially bypassing the module and connecting the bus together, would I then have data flowing?

Could the car at least function without the EPS module connected?

Just a thought I had to see if it was actually my issue or something else entirely.

 

[Ark :D]

If I were to conect the high speed where it enters and leaves the EPS module, essentially bypassing the module and connecting the bus together, would I then have data flowing?

Could the car at least function without the EPS module connected?

Just a thought I had to see if it was actually my issue or something else entirely.

Some people have gone without power steering, so I can only presume those people are cutting the EPS out of the sequence for the high speed data. It probably results in a cluster error message though?

 

[Gtstorey]

Most of the data is transferred on the high speed network from the ECM module, pretty much anything that needs to be real time. If you are seeing the ECM data your highspeed is functioning, at least to some extent.

 

[Dominicnicklyn]

Most of the data is transferred on the high speed network from the ECM module, pretty much anything that needs to be real time. If you are seeing the ECM data your highspeed is functioning, at least to some extent.

That's what I was thinking, but just wanted a second opinion

Ima try bypassing the eps tonight and see if I get anything to work.