I've been learning a lot about ECUs lately Based on what I read, if you have to replace the ECU, the dealer needs to program it. Most of my reading, the programming involves setting up the immobilizer for the security system. But I admit to ignorance here. I'm just trying to get the damn thing running again.

So, I have a 89661-3D150 ECU. Based on what I read, this is the one for a V6,AT, 4WD SR5. The one that was in my car has had one of its ignition outputs killed. So, it has to go out for repair. Because I was in a hurry, I decided to try and pick up a used one off ebay ($135 risk level, why not?). The engine runs now, but runs very poorly and throws a "cannot sense camshaft position error". This according to the shop (who won't get any more of my business) who gave it a try. Of course, I have no idea if the used unit is bad.

But, I was wondering - is there some special programming for the ecu that needs to be done such that it would work? I've read other people saying that obtained a used ecu - exact part match - and their truck ran fine.

Appreciate your thoughts

 

I don`t know about the newer ones maybe you are correct!! With a factory Alarm .

I know the older ones you just plugged the correct part # one in and were good to go.

Do you have a good relationship with your local dealer?? Call and ask the Service manager.

Just for my own peace of mind I want to find out be good to know.

 

Yes any ECU with a alarm unless you get the remotes needs to be reprogramed so the vehicle remotes are able to communicate with it .

Then all works like it should Other wise the vehicle remains disabled.

If this was not the case the whole alarm could be rendered useless just by swapping ecu units

 

Hi all, I'm just sliding in to add to this thread, although I will need to start a new one for my complex issue.( resetting ECU via Techstream to get out of Limp Mode). Has anyone seen Timmy the toolman on Youtube swap an ECU in a 3rd Gen 4Runner? According to him you don't need to reprogram for Keys or entry, On a replacement as long as your modle # are the same. I asked. It seems this could be the case with certain ECU models,? I read that if one had earlier versions of Toyota Techstream - v12 and 13, one could access the software's security reprograming modules. add + subtract Master, Slave, and Valet keys, reprogram new keys, etc.. I actually don't know about the immobilization connection with the new keys. This module had been removed from ALL newer versions of Techstream.. currently we are on v18.. I think,.. Now finding a copy of V12-13 seems difficult without being legitimately allowed to find it though Toyota. Just what I've red so far. I have also seen a Youtube tutorial about reprograming the EEPROM on your exiting ECU to remove old keys and reprogram new ones and fobs, and the Immobilized. It was a bit complex but easy enough with step by step instructions, and you needed to buy some cheap connection boards to do the reset. I do a ton of searching on DIY fixed for issues. I can never afford a Dealer , let alone a skilled Toyota mechanic shop. Even now, I'm going to try to 'reset' ECU out of 3rd stage Limp Mode.. ( wont drive faster that 15mph).. Maybe I'll start my tread on the subject now..