2014 Toyota Corolla with Intermittent Electrical Problems

[mpaavi]

I am having trouble diagnosing an electrical problem on my 2014 Corolla. It can take from one to +100 km before a malfunction occurs. The last time I drove about 80 km, and suddenly ABS, EPS, air conditioning and speedometer failed. The car works after being turned off. You can erase the fault code and all the indicators will go out.

Does anyone have any wiring diagrams or any tips on this? Help!
DTC report attached.

 

[popeye2]

The ABS sensor is damaged. All other problems are related. Check the fault code, on which wheel the problem occurred. ABS sensors can be purchased inexpensively on third-party markets.

 

[evgenijj]

You need to use a more adequate scanner, not just an OBD reader.

 

[Cartunningshop]

My guess is that your ABS module is most likely starting to fail and have issues since it is the contact point for all the sensors in your trouble code.

 

[popeye2]

Yes, Techstream is recommended for diagnosing any ABS module. Especially if your Corolla has a hybrid engine. After replacing the faulty sensor, re-initialize the ABS system in Techstream. Toyota control units usually do not break down. Look at the cheap prices on used controllers, this is not a silent failure. The hybrid system monitors braking power and tries to recuperate it before braking. This is where the numerous errors occur when the ABS speed sensor does not work properly.

 

[mpaavi]

Actually, I have an Openport 2.0 clone and a Techstream installer somewhere. I don't know if the OP clone will work better, but I'll give it a try and check the sensors visually and with a multimeter for corrosion, broken wires, etc. I've already removed some of the ABS unit wires, they look good and are pretty well protected, so I don't think there are any wires that would start to break. Same with the ground wires in the engine bay.

But I'll have to reinstall everything, test it and hope the problem comes back, and then try Openport + Techstream.

No, it's not a hybrid. 1.6 petrol 1ZE-FAE, I forgot to write in the first post.

 

[evgenijj]

You have intermittent problems with the brake system, but the OBD scanner can only read data from the ECM. Techstream will do.
Read the codes from the ABS and post here.

 

[mpaavi]

Found this in the ABS history via Techstream. No error codes so I guess I just need to go driving.

 

[mpaavi]

Actually, it worked now when I start the engine. Now when the error is on, I can't access the ABS/VSC/TRC, EMPS, AC and THEFT DETERRENT modules.

 

[mpaavi]

Attached files were made after restarting the engine. There are no ABS error codes and error history, maybe because this time the error occurred when I was not driving? Error code U0129 can be reset. And forget about the anti-theft system, it seems I do not have one.