Error codes:
U0100 Lost Communication With EV ECU
U0101 Lost Communication with TCM

 

Hi!

What's the year and engine configuration? If it's not a hybrid does it have a smart key or a regular key?

Also anything done to the car recently? like backwards jump or aftermarket accessories?

 

It's a 2013 SE 2.5L. Non-hybrid
recently I installed LEDs in the license plate and fog lights. Nothing that would touch the ECM.

 

Did the issue happen after the install?



Sent from AutoGuide.com Free App

 

No its been some days. All of a sudden today the car won't start. It cranks but won't start.

 

Ok let me look into this and get back to you.

these are the only codes you have, correct?


Sent from AutoGuide.com Free App

 

Yeah that's the only ones. Thanks. I'm leaving the car at the shop for now.

 

Check the following fuses
Am2
Ig2-main
Ecu-main no.1
Efi no2
Ecu-ig2 no 3
Ecu-ig2 no1

If they are all good check that the efi-main no1 fuse has power going to it while in the fuse box with the key on.

How many miles on this car and has it been in any accidents?


Sent from AutoGuide.com Free App

 

Yes, if the check engine light doesn't illuminate during the bulb check sequence when you first switch the key to ON...it usually means the ECM isn't coming on. It may not be getting power or ground or It may not be getting the input signal to switch on. No ECM...no spark, no injectors...no start.

 

Also check these fuses

Efi no1
Am1

And with the key off remove the rubber insulator on the big stud on the alternator and check if you have voltage there as well


Sent from AutoGuide.com Free App

 

All wiring and fuses checked out, still no ecm communication. Got an ecm from a rav4 and communication works now. So it's the ecm that's stopped working for sure. Getting the car towed to Toyota to have it replaced. They'll still need to go thru all the trouble shooting I guess.

 

That is odd that an ecm would just seize on its own.

I have seen 2 cases similar( I am a master tech at a toyota dealership) I have seen an accident where the ecm was physically hit and another were a body weld went through the charcoal canister wire.

Make sure nothing aftermarket is obviously installed because toyota has a new procedure to order ecms even if you are paying for it. You have to verify that there's nothing wrong with the wiring for them to release the new ecm.




Sent from AutoGuide.com Free App

 

( I am a master tech at a toyota dealership)

We are most certainly glad you are here

 

Well I'm glad to be here too. Nice community.

I would love to help out with whatever I can help with.

Greatavalon, I was not attacking your comment , I just didn't know how people would react. I actually recently bought a set of hids for my camry from xenondepot based on your awesome review, thank you!




Sent from AutoGuide.com Free App

 

No worries, man! I didn't think you were

Glad you found my review helpful. Cheers! :chug:

 

Definitely glad you're here. Your help is greatly appreciated!!

They just started looking at the car now half an hour ago so let's hope for the best.

The shop foreman is handling it and said he came across a Corolla some months back with the same issue. No reason for it the car just wouldn't start all of a sudden.

Reading up online lots of people noticed tranny issues with gear switching not being smooth etc.

 

Good luck!

 

Amen…It's wonderful that you and others are willing to share your hard earned expertise to help us fully enjoy our "Toys".