2019 Tacoma, MT, Magnuson, ECU HELP

To start I don't really post because I do plenty of lurking and find what I need but this has me finally needing some help.

So the Truck: 2019 Tacoma Pro, MT, Magnuson, Skid plates, Rock Sliders, Steel Bumpers, Air Bags with wireless controller, 1" lift, Winch, Anytime camera mod with front camera added, lights in the bumpers and scoop on 4 switches, Innovate Vac/Boost and Wideband O2 sensor.

I installed the Magnuson in 10/20 at 19500 miles as well as most of the other mods. Prior to the Magnuson I had an OV tune on the truck, then went to the Magnuson tune.
The most recent changes (besides regular maintenance) before the story starts was rerouting the exhaust to add the rear cats back onto the truck and replacing a faulty o2 sensor and the innovate Wideband o2 sensor. 9/24 at 36714 miles.

I took the truck out camping and was pretty rough on it but had no issues. I had an appointment to upgrade to the OTT tune and on the way to the appointment on the highway I got error's, I'm not sure which errors the dash lit up (TSS and braking I think) the truck lost power and as I went to move to the side of the road everything cleared. Truck was running fine again.
I proceeded to the appointment I expected to find the TSS sensor unplugged or something. We checked the error codes and only found the previous o2 sensor code. We flashed the truck from 04B41 to 04B42 then flashed the OTT tune. We drove the truck with data logging and everything looked fine.
On the way home about 45min into the drive the truck gave me multiple error codes and lost all power, I pulled to the side of the road and turned off the truck, on restart the truck started and ran with out issue showing no CEL and no error messages.

The next time I went to drive the truck I made it about 1 mile down the road until I got the error messages: Brake Override Malfunction, Drive-Start Control Malfunction the tuck won't start.
I towed the truck home.
SO TRUCK IS NOT RUNNING
I can't communicate with the ECU, my scanner says failed to connect, When I connect Laptop with VF Tuner it also doesn't communicate with the ECU.
I have disconnected both batteries for multiple hours and the errors are still present.
I have checked every fuse in the truck with a meter and replaced some anyway, like the stop fuse.
I have traced wires all over the place for any damage.
I removed the trailer brake controller, I removed the anytime camera.
I confirmed all the pins in the OBD II connector are tight.
I confirmed the brake light switch is working as well as all of my brake lights.
I did find that the oil pressure sensor plug was disconnected and reconnected it, when I did that I now have an error message of low oil pressure.
I also found that one of the hard brake lines next to the wheel was bent and possibly kinked so it has been removed and replaced.
I pulled the ECU and have ordered a new one but can't seem to get an update on when it will be here.
I was surprised to find that I still have error messages on the dash with the ECU completely disconnected from the truck.

I'm looking for advice on how to proceed, is there something I am missing ?

Thank You.

 

As an update, I installed a new ECU yesterday and absolutely no change.

 

Yikes dude that sucks….. not sure how to help but here hoping for you to get this fixed. Keep us posted, im curious as i have a 2019 trd OF 4x4 with a maggy too, about 55k with the SC alone, about 110k on the clock. I have the yotawerx tune tho, so far only issue i had was one time i didnt wait for it to warm up to temp and gave her the beans at a stop light and it back fired and went into limp mode. I pulled over immediately and shut it down thinking i just fucked my truck up. Gave it a minute, fired it back up, let it warm up to temp and it was fine ever since…..

 

How long ago did you have that happen ? How cold out was it ?

I haven’t had one issue with the truck until this. The problem is I don’t know what to check. After failing to connect to the new ECU, I replaced both batteries just for kicks, and tested all the relays in the in the engine compartment fuse box and the driver kick panel area.
I guess I’m buying a body control module next.
From the schematics on AllData it looks like the OBD port runs through the Body Control Module before connecting to the ECU.
We’re getting hammered with snow and I have an elk hunt starting Sat so I’ll wait for it to come in.

 

2019 TRD OR here, I very rarely post on TW but I must say I have excelled as a world class lurker. I really dig this forum and have learned so much from you all and thanks to you I have spent a good bit of $$$ on Mods over the years, but love my QS sled. I felt compelled to chime in and share my experience and "so far" solution to this Brake Over Malfunction issue. I was experiencing this issue for some months and on at least a weekly basis, sometimes more. Out of the blue my truck would go into limp mode with the B.O.M. error message along with a Christmas tree of other lights on the dash. It was super sketchy because some of the roads I drive here are high speed and lack much of a shoulder to bale out of traffic, so I got lucky for sure. To get back on the road I found if I d/c the positive battery terminal, wait for a few mins, reconnect and that would temporarily clear the issue. No shop could seem to ID the issue, including my local Toyota stealership. They all told me that until I can limp the truck in while the issue was occurring they can't help me, which seemed crazy to me. The Toyota stealership did offer to tow the truck at their cost if it happened within their general area. However, I live over 50 miles from there and I'm rarely in that area, so that wasn't super helpful. The error finally occurred in town close to a local shop (Ultimate Motors), so I was able to hobble her in. Ultimate Motors has been great to us over the years and did most all the major work on my old 2001 Tundra, 3 timing belts and water pumps, etc. I gave that Tundra to a family member in Vegas that was in need, she had 396k miles. She was a great truck ran like a top and I often times miss that 4.7 liter V8. Anyhoo after a few days Ultimate calls me to say they believe they IDed the issue as a failed "engine mounted vacuum pump". The part was on back order with Toyota but after a few weeks of grinding we were able to find one at a Toyota joint up in the L.A area, (Longo Toyota). Ultimate sent their guy up there the next morning to get the part. It's been a 2 or 3 months now with no issues. NOTE: I am on a mild OTT Tune. Hope this helps you and anyone else out there dealing with this aggravating issue.

 

Thank you, I will dig into looking at the vacuum pump. I’m going to go test grounds today. I haven’t been able to get any codes to clear with battery disconnects.

 

Stupid question: Are you pulling the fuse the Magnuson water pump is connected to before you try to flash?

During the install the water pump is tied into a fuse in the engine bay fuse box, which starts the pump when the power is turned on. DO NOT PULL THAT else you will not be able to flash the ECU.

Originally I was pulling that to prevent battery drain while flashing ECU, but came to find out I could not connect to ECU when that fuse was pulled.

I guess you could also put extra attention to that fuse, if there is any issue with that fuse the engine will crank but will not turn over.

 

We didn’t pull the fuse to the SC to flash. The pump is working correctly with key on it comes on.
With the lead to the SC connected to that fuse (which is the ignition fuse) I have 80 ohms of resistance from the efi-main relay and the ign2 relay to ground. The spec is greater than 10k ohms. I was convinced that was the issue, but with it disconnected I don’t have a ground fault but also still don’t have power to the ecu.
The relay tests correctly and from what I can tell it should provide 80 ohms of resistance until the coil is energized.

 

Update:
I made some progress, I can connect to the ECU now. The pin in the fuse block that the Magnuson water pump was connected to was damaged and pulling out of the bottom of the fuse block. Thanks AnotherUser256. I separated the fuse block and soldered in a new fuse holder for that fuse.
I can now connect to the ECU and have refreshed it to stock and then flashed the Magnuson tune back to the truck.
The truck shows no error codes but the check engine light is on and it won't start. It cranks but doesn't fire.

 

Update on Update.
I guess that partial connection bricked the ECU. I attempted to do ECU recovery with VF Tuner but it is Errors out.
With the new ECU in the truck runs but I can't flash it because there isn't a VIN programmed to the truck. If I try to program it to the trucks Vin I get a message that the VIN can't be used. If I try to use a random VIN it won't complete for some reason.
So I have it running but can't flash to the Magnuson tune.
Any Ideas ?