need help with VSC

Hi,
I have a problem with my 2020 Tacoma TRD Pro. The VSC Lapme (Slip indicator) goes on permanently and as soon as you drive 2m the pre-collision lamp comes on.

I think you would have to recalibrate the VSC. Since it's a 2020 you can only do it with Techstream (I got Techstream) but during the learning process only the ABS lamp flashes but the slip indicator light stays on permanently.
After the learning process, the pre-collision lamp is off, but the slip indicator remains on and as soon as you drive again, the other lamp comes on again.

I'm Niclas from Germany and the Toyota dealer can't help me, the airbag ECU and the ABS ECU are completely new but the errors are still there.

I hope someone has a helpful tip

Attached is a picture of live measurements, maybe someone has a picture of their Tacoma so I can compare it

 

Check and make sure the VSC and ABS sensor wires are not stretched.

 

while driving, however, the wheel speeds look good. but I can measure the cables tomorrow

 

why were the ECU and ABS ECU replaced?
Just trying to get the bigger picture, that might help point folks in the right direction to get you some help.

 

I replaced it and hoped the problem would go away

Thank you for your prompt reply

 

What was the reason that you replaced the parts?
What happened to cause the need to replace the parts?
Are the replacement parts from Toyota (Original Equipment Manufacturer - OEM)?

 

I had bought the Tacoma with the errors because the error log only said that the yaw rate and deceleration sensors were not calibrated (C1210, C1336). Me and the Toyota dealer tried to recalibrate it but it didn't work and that's why the airbag ECU was replaced first and then the ABS ECU (OEM Toyota directly from the USA)

 

I think you are still going to have to go back and find the root of the problem. Not trying to add insult to injury here, but when you don't identify the issue and start swapping parts in hopes it might fix the problem, you have made diagnosing the initial problem even more difficult, by introducing more variables.
You need to get it to another dealer, if the dealer can't diagnose it with their tech and the truck in theirs hands, I don't think us guessing on via the net will be much more help.

 

Unfortunately, the Toyota dealers in Germany cannot access a US Toyota with their technology.

I was hoping that I could compare the live data with someone

 

There’s some dealer techs, hopefully they can help.

 

Unfortunately I haven't found one in Germany yet, the Tacoma was even 8 weeks at a Toyota dealer who imported Tacomas. but apart from a big bill they couldn't do anything

 

@Bishop84 May have some insight.

 

Do the canbus check, and a full health check. Need to see what modules are hand shaking first.

What codes are stored? If any?

 

CAN Check was ok and I also measured all CAN lines. With a complete health check, only the two errors C1210 and C1336 come up when you have driven and after learning there are no more errors stored

 

maybe one of you can send me a picture of your live data from the VSC/ABS ECU (ignition on and gear in P)

I think that would help

 

Why are the ecu's new?

Have you done the handshake yet?

https://www.youtube.com/watch?v=QocuEYNE6KM

We use the technique when issues arise with new ecus. (I cant share infostream information)

Basically you jump 4 and 13 key on with a battery charger for 30 mins.

 

I first replaced the complete airbag ECU unit because it contains the sensors for the VSC. And then I replaced the entire VSC/ABS hydraulic brake unit and hoped that the error would go away, since the old control unit could not be recalibrated either.

I'll try it tomorrow with the paper clip and hope I don't break it even more

 

What you mean with handshake?

 

Registering ecu with one another. Basically beyond initializing you make them hand shake and accept each other.

 

Just because Germany out of the WC...

here is mine, but it is SR5