1st Gen Haltech ECU Discussion

I didn't change much from the presets that they give you off the bat.

NOTE to other people: Don't use this map to "fix" starting issues... I'm working on that right now. It changes with the weather and I've had to create a 3D map to try and get it good, but it's not there yet.

Sorry for the slow response, I'm leaving country for a week. See you next Friday.

 

Happy to report (hopefully not prematurely) that installing an Aeromotive 340lph fuel pump seems to have fixed my engine dying issue. I left the neoprene sleeve off this time in hopes that it will allow better cooling from the fuel pool.
For anyone curious, I wouldn't go with a Walbro 255 ever again - they're loud and this one lasted < 5 years and I did buy from an authorized dealer. Weirdly, the Walbro is rated in l/h, but the Aeromotive is rated in lbs/hr. 650cc/min injectors => 39lph => 61.9lb/hr, so neither should have any issues delivering the flows we need on pump gas, even if you're using a boost-referenced regulator source, but just an interesting detail I didn't notice at first.

Divide by 1.587 to get the lph equivalent.

Another weird thing I discovered in my diagnosis is that my fuse box says 15amps for the EFI fuse (fuel pump & others), but diagrams all show 20A. So I left a 20A fuse in there.

 

Well, fuck. Never mind. It died on the way back from the grocery store and wouldn't start again. Just starting & immediately dying. The only consistent code is a Trigger Reference Error, the other is CTS over max. The trigger waveform looks totally fine but idk what else to look at
Genuinely stumped

 

A few months ago I had a high boost lean condition that would send the AFRs into the 40+ range, obviously, the Haltech could not correct for this if it tried. No matter if I finessed the throttle, or drove it like a madman, when it boosted past 5psi or so the AFRs shot up, and the truck would drive like there was a parachute behind it.

Turns out it was an exhaust leak. The donut gasket on the right collector on my TRD headers was no longer sealing properly. Luckily, I planned to pull the tranny to replace the clutch, so it made replacing all of the gaskets on the exhaust system really easy. After new exhaust gaskets the AFRs are where they should be, and all is well again. Just thought I put that out there.

 

CTS over Max sounds like a dead short somewhere. Have you looked for burned loom yet?

 

I just separated the CTS wires again (frayed). Didn't see any contact but the code hasn't come back.
Just modified my threshold settings again and was able to start it again after a while... not sure if that was coincidence or not but I did notice the trigger square wave was not being generated for a minute there when cranking... even though the thresholds should have been passed. Lowered them anyway. Also RPM was randomly spiking when cranking to the thousands.

 

Thanks, I'll double check the exhaust too. I did just make some changes to it a few weeks ago. I hope the flex pipe isn't already damaged...

 

This shouldnt matter if the Wideband isn't ready yet though, so I'll check that if the immediate dying happens again. Maybe that will narrow it down.

 

That would be a lot of immediate correction if that's what's causing it. You should be able to spot that trend in your long-term trims. Also I don't know about you but I keep trimming turned off during post start correction

 

It's near instantaneous now. As soon as sync is obtained, and IAC peaks, it dies. I went on a few more drives tonight as I was tweaking my toe alignment and it didn't die (after the trigger voltage adjustment). Idk why this site doesn't allow mp4s or I'd just upload the vid here. I'll upload to yt

https://youtu.be/bDoBDZpTAls?si=v04lpuNmjzpWiRkH

 

You should try splitting the grounds near ecu in main harness. Can't hurt.

 

I'm not sure it would do anything since he still has a stock ECU wired in too for the trans and unfortunately that ties the sensors together internally as well

 

Oh, didn't know that. Cut the ground bridge in ecu too?

 

If I can get a base transmission tune from you or something I'll just drop the whole stock ECU. Only reason I haven't done it myself yet is because I haven't gotten my new OBDII port running (for my insurance thingy) or speedo working again yet, not to mention all the other things calling my name on the truck

 

If your insurance thingy doesn't report anything at all doesn't that just mean your rates are even better? I'd be happy to give out the trans too and once I figure it out, that's going to be a winter project. It doesn't look like it's going to be hard at all. We just don't get the super fancy features cuz we're not drive by wire which is a little annoying.

 

It really just needs power tbh, it's GPS enabled. But it does report the factory ECU DTCs to it's app as well

But ya I'm excited to have more control of the transmission. I guess I'm also forgetting that I need to pipe in the gear position sensor still too. Got lost on that because I was trying so hard to find a terminal to make a harness instead of splicing

 

The instant start and die is interesting but if you still had the CTS errors it might be overfueling on start due to a correction being applied.

 

Do you have a way of checking fuel pressure at the rail? Maybe a clog?

 

No but I can go rent a gauge. Is there even a service port on these rails though?
I can't imagine how a clog would have happened, or even a dirty fuel filter. It's maybe been 40k miles max? Guess I could pick one up too, they're cheap

 

There's no service port, you'd need the special banjo bolt that adds a service port or you'd need to cut the feed line to install a gauge.